is there a solution, that i can update my View from my Backing-Bean.
I have the following lines of code. I want to update my growl element from inside the loop.
public void starteTransition() throws InterruptedException {
FacesMessage m;
RequestContext context;
int i = 0;
while (i < 100) {
System.out.println(i);
if (i >= 10) {
m = new FacesMessage("10");
FacesContext.getCurrentInstance().addMessage(null, m);
context = RequestContext.getCurrentInstance();
context.update("formTop:msg");
}
if (i >= 50) {
m = new FacesMessage("50");
FacesContext.getCurrentInstance().addMessage(null, m);
context = RequestContext.getCurrentInstance();
context.update("formTop:msg");
}
i++;
Thread.sleep(500);
}
}
But the update is only done when the Loop has finished.
How can i solved this?
As I understand it you can do it with a p:socket. Create a unique channel for each user.
Also see the user guide p. 562.
Related
In my JavaFx application, i'm loading an ObservableList when a button is clicked and then display the list in a table.
the controller code:
#FXML
private void initialize() throws SQLException, ParseException, ClassNotFoundException {
searchChoice.setItems(criteriaList);
searchChoice.getSelectionModel().selectFirst();
productIdColumn.setCellValueFactory(cellData -> cellData.getValue().productIdProperty());
unitColumn.setCellValueFactory(cellData -> cellData.getValue().unitProperty());
productTitleColumn.setCellValueFactory(cellData -> cellData.getValue().titleProperty());
productTypeColumn.setCellValueFactory(cellData -> cellData.getValue().typeProperty());
productUnitPriceColumn.setCellValueFactory(cellData -> Bindings.format("%.2f", cellData.getValue().unitPriceProperty().asObject()));
productQuantityColumn.setCellValueFactory(cellData -> cellData.getValue().quantityProperty().asObject());
productStatusColumn.setCellValueFactory(cellData -> cellData.getValue().productStatusProperty());
descriptionColumn.setCellValueFactory(cellData -> cellData.getValue().descriptionProperty());
reorderPointColumn.setCellValueFactory(cellData -> cellData.getValue().reOrderPointProperty().asObject());
surplusPointColumn.setCellValueFactory(cellData -> cellData.getValue().surplusPointProperty().asObject());
productIdColumn.setSortType(TableColumn.SortType.DESCENDING);
productTable.getSortOrder().add(productIdColumn);
productTable.setRowFactory(tv -> new TableRow<Product>() {
#Override
public void updateItem(Product item, boolean empty) {
super.updateItem(item, empty);
if (item == null) {
setStyle("");
} else if (item.getQuantity() < item.getReOrderPoint()) {
setStyle("-fx-background-color: tomato;");
} else if (item.getQuantity() > item.getSurplusPoint()) {
setStyle("-fx-background-color: darkorange;");
} else {
setStyle("-fx-background-color: skyblue;");
}
}
});
try {
ObservableList<Product> productData = ProductDAO.searchProducts();
populateProducts(productData);
String[] expireDate = new String[productData.size()];
String[] id = new String[productData.size()];
String[] existingStatus = new String[productData.size()];
for (int i = 0; i < productData.size(); i++) {
expireDate[i] = productData.get(i).getExpireDate();
id[i] = productData.get(i).getProductId();
existingStatus[i] = productData.get(i).getProductStatus();
DateFormat format = new SimpleDateFormat(app.values.getProperty("DATE_FORMAT_PATTERN"), Locale.ENGLISH);
Date expireDateString = format.parse(expireDate[i]);
Date in = new Date();
LocalDateTime ldt = LocalDateTime.ofInstant(in.toInstant(), ZoneId.systemDefault());
Date today = Date.from(ldt.atZone(ZoneId.systemDefault()).toInstant());
if (expireDateString.before(today) && !existingStatus[i].equals(app.values.getProperty("STATUS_TYPE2"))) {
ProductDAO.updateProductStatus(id[i], app.values.getProperty("STATUS_TYPE3"));
}
if (expireDateString.after(today) && !existingStatus[i].equals(app.values.getProperty("STATUS_TYPE2"))) {
ProductDAO.updateProductStatus(id[i], app.values.getProperty("STATUS_TYPE1"));
}
}
ObservableList<Product> productDataRefreshed = ProductDAO.searchProducts();
populateProducts(productDataRefreshed);
ObservableList<Product> productCodesData = ProductDAO.getProductCodes();
ObservableList<Product> productTitlesData = ProductDAO.getProductTitles();
ObservableList<Product> productTypesData = ProductDAO.getProductTypes();
ObservableList<Product> productStatusData = ProductDAO.getProductStatus();
String possibleProducts1[] = new String[productCodesData.size()];
for (int k = 0; k < productCodesData.size(); k++) {
possibleProducts1[k] = productCodesData.get(k).getProductId();
}
String possibleProducts2[] = new String[productTitlesData.size()];
for (int k = 0; k < productTitlesData.size(); k++) {
possibleProducts2[k] = productTitlesData.get(k).getTitle();
}
String possibleProducts3[] = new String[productTypesData.size()];
for (int k = 0; k < productTypesData.size(); k++) {
possibleProducts3[k] = productTypesData.get(k).getType();
}
String possibleProducts4[] = new String[productStatusData.size()];
for (int k = 0; k < productStatusData.size(); k++) {
possibleProducts4[k] = productStatusData.get(k).getProductStatus();
}
TextFields.bindAutoCompletion(searchField, possibleProducts1);
TextFields.bindAutoCompletion(searchField, possibleProducts2);
TextFields.bindAutoCompletion(searchField, possibleProducts3);
TextFields.bindAutoCompletion(searchField, possibleProducts4);
} catch (SQLException e) {
Alert alert = new Alert(Alert.AlertType.ERROR);
alert.setTitle(app.values.getProperty("ERROR_TITLE"));
alert.setHeaderText(app.values.getProperty("FAILURE_MESSAGE"));
alert.setHeaderText(app.values.getProperty("ERROR_GETTING_INFORMATION_FROM_DATABASE_MESSAGE"));
alert.showAndWait();
throw e;
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
the service mysql query :
public static ObservableList<Product> searchProducts() throws SQLException, ClassNotFoundException {
String selectStmt = "SELECT * FROM product";
ResultSet rsPrdcts = DbUtil.dbExecuteQuery(selectStmt);
ObservableList<Product> productList = getProductList(rsPrdcts);
return productList;
}
The issue here is, when there are more than 200-300 items in the list the scene gets really slow to load. What countermeasures can I take regarding this matter? Any idea will be very much appreciated.
Thanks in advance.
You need to implement an ObservableList which only retrieves the data which is rqeusted by the TableView. Currently you retrive all elements in the table and cast the retrieved list to an ObservableList.
The TableView uses the .get(int idx) method of the OL to retrieve all items which should be displayed and the .size() method for determining the size of the scrollbar. When you scroll the TableView will discard all items which are not displayed and call the get method again.
To solve your problem need to create a class which implements ObservableList<E>. First you need to implement the .get(int idx) and the .size() method, for all other methods I would throw new UnsupportedOperationException() and later on see which other method is needed. So the .size() method needs to execute the following query
SELECT count(*) FROM product
and the get(int idx) something like this
int numItems = 30;
int offset = idx - (idx % numItems)
SELECT * FROM product LIMIT offset, numItems
you can create an internal list which only holds e.g. 30 items from your db and whenever the requested idx < offset || idx > offset + numItems you issue a new db request.
I used this this approach with database tables with millions of rows and had a very performant GUI. You can also add paging to the TableView because with to many rows the scrollbar gets useless, but this is a different discussion.
edit:
I forgot to mention that this is called Lazy Loading
I'm trying to create a ScrollView class with cocos2d-2.0-rc2-x-2.0.1 and I mean to do something in update function to implement the auto-scroll effect.Unfortunately,I find the function has never been called.Though I've done a lot of work like searching on the internet,debuging step by step and so on,the possible solutions I found helped little.
As far as I know,my ScrollView class derive from CCNode and I've implemented the update function.The declaration of ScrollView is as following:
class ScrollView:public CCNode,public CCTouchDelegate
{
ClippingNode* visible_view;
CCNode* content_view;
//CCArray* items;
float row_margin;
float col_margin;
float interval_margin;
float last_y;//起始y方向坐标
float interval_dis;//间隔时间段内y方向上的位移。
bool touch_stopped;//标识触摸是否停止，主要用于自动滚动。
float up_bounder_y,down_bounder_y;//content_view的y方向坐标上下限
int items_num;
public:
static ScrollView* New(CCSize visible_view_size,float row_margin,float col_margin,float interval_margin,CCNode* background = NULL);
void ccTouchBegin(cocos2d::CCNode *node,const cocos2d::CCPoint &point);
void ccTouchMove(cocos2d::CCNode *node,const cocos2d::CCPoint &point);
void ccTouchEnd(cocos2d::CCNode *node,const cocos2d::CCPoint &point);
virtual void onEnter();
protected:
CCNode* makeCard();
void initContent();
private:
ScrollView():visible_view(NULL),content_view(NULL),touch_stopped(true){}
virtual ~ScrollView();
bool init(CCSize visible_view_size,float row_margin,float col_margin,float interval_margin,CCNode* background);
void update(float dt);
};
And here is the definition of update function:
void ScrollView::update(float dt)
{
CCLOG("update");
if(touch_stopped)
{
if(abs(interval_dis) < a)
{
interval_dis = 0.0f;
this->unscheduleUpdate();
}else
{
if(interval_dis < 0)
interval_dis += a;
else
interval_dis -= a;
const float future_y = content_view->getPositionY() + interval_dis;
if(future_y > down_bounder_y && future_y < up_bounder_y)
{
content_view->setPositionY(interval_dis);
}else if(future_y <= down_bounder_y)
{
content_view->setPositionY(down_bounder_y);
interval_dis = 0.0f;
}else
{
content_view->setPositionY(up_bounder_y);
interval_dis = 0.0f;
}
}
}
}
So I can ensure the type of the param is float instead of CCTime or ccTime which may cause update function never to be called.Moreover,I invoke the scheduleUpdate in the init method like the following:
bool ScrollView::init(CCSize visible_view_size,float row_margin,float col_margin,float interval_margin,CCNode* background)
{
visible_view = ClippingNode::New(visible_view_size);
CHECK_RETURN(visible_view,NULL,false);
visible_view->retain();
content_view = CCNode::create();//node函数中已调用autorelease
CHECK_RETURN(content_view,NULL,false);
content_view->retain();
this->row_margin = row_margin;
this->col_margin = col_margin;
this->interval_margin = interval_margin;
this->setAnchorPoint(ccp(0.5f,0.5f));
this->setContentSize(visible_view_size);
visible_view->setPosition(0,0);
content_view->setAnchorPoint(ccp(0,1));
content_view->setPosition(row_margin,visible_view_size.height);
content_view->setContentSize(CCSize(visible_view_size.width - 2 * row_margin,2 * col_margin));
this->addChild(visible_view);
visible_view->addChild(content_view);
down_bounder_y = visible_view_size.height;
up_bounder_y = content_view->getContentSize().height > visible_view_size.height?content_view->getContentSize().height:visible_view_size.height;
UserData* user_data = UserData::getUserData(this,true);
CHECK_RETURN(user_data,NULL,false);
user_data->setContainer(true);
items_num = 0;
initContent();
if(background)
{
background->setScaleX(visible_view_size.width/background->getContentSize().width);
background->setScaleY(visible_view_size.height/background->getContentSize().height);
background->setAnchorPoint(ccp(0.5f,0.5f));
background->setPosition(visible_view_size.width/2,visible_view_size.height/2);
user_data = UserData::getUserData(background,true);
user_data->setHitable(false);
this->addChild(background,-1);
}
this->scheduleUpdate();
return true;
}
Through debug,I can ensure the sentence "this->scheduleUpdate()" is invoked.In addition,I created a ScrollView object named scroll_view and added it to the main node through addChild function.So,where am I wrong?Any addvice would be appreciated and thanks for watching:p
I forgot to invoke the CCNode::onEnter in my own onEnter function. Thus all we need to do is invoke CCNode::onEnter in the ScrollView::onEnter. Hope other people don't make the mistake as I did.
If you invoke the onEnter, scheduleUpdate() may be not working.
CCDirector::sharedDirector()->getScheduler()->scheduleUpdateForTarget(this,0,false);
or
CCDirector::sharedDirector()->getScheduler()->scheduleSelector(schedule_selector(NewGame::update),this,0.1,false);
Dont know why your code is not working but have you tried this:
CCDirector::sharedDirector()->getScheduler()->scheduleUpdateForTarget(cocos2d::CCObject *pTarget, int nPriority, bool bPaused);
you can check whether the node responds to update() call using:
pNode->getIsRunning();
I have to limit the number of rows in a JTable. If I have 100 records I need to display 10 on the initial loading of JTable. I wish to put a button like "next", and after each click it shows another set of 10 records.
I have to limit the number of rows in a JTable. If i have 100 records i need to display 10 on the initial loading of JTable.
Use preferred size (+ an appropriate layout and layout constraint) to fix the size.
I wish to put a button like "next", and after each click it showing another set of 10 records.
Remove the scroll bar on the RHS of the scroll pane. Then use buttons instead for the effect of 'next/previous'.
Like this
FixedRowsTable.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
class FixedRowsTable {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
String[] columns = {"1","2","3","4","5","6","7"};
Integer[][] data = new Integer[1000][columns.length];
for (int xx=0; xx<data.length; xx++) {
for (int yy=0; yy<data[0].length; yy++) {
data[xx][yy] = new Integer((xx+1)*(yy+1));
}
}
final int rows = 11;
JPanel gui = new JPanel(new BorderLayout(3,3));
final JTable table = new JTable(
new DefaultTableModel(data, columns));
final JScrollPane scrollPane = new JScrollPane(
table,
JScrollPane.VERTICAL_SCROLLBAR_NEVER,
JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
Dimension d = table.getPreferredSize();
scrollPane.setPreferredSize(
new Dimension(d.width,table.getRowHeight()*rows));
JPanel navigation = new JPanel(
new FlowLayout(FlowLayout.CENTER));
JButton next = new JButton(">");
next.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent ae) {
int height = table.getRowHeight()*(rows-1);
JScrollBar bar = scrollPane.getVerticalScrollBar();
bar.setValue( bar.getValue()+height );
}
} );
JButton previous = new JButton("<");
previous.addActionListener( new ActionListener(){
public void actionPerformed(ActionEvent ae) {
int height = table.getRowHeight()*(rows-1);
JScrollBar bar = scrollPane.getVerticalScrollBar();
bar.setValue( bar.getValue()-height );
}
} );
navigation.add(previous);
navigation.add(next);
gui.add(scrollPane, BorderLayout.CENTER);
gui.add(navigation, BorderLayout.SOUTH);
JOptionPane.showMessageDialog(null, gui);
}
});
}
}
If you use an AbstractTableModel you can display millions of records. The idea is that your model will be loading whatever records are needed for the view, on demand.
Here you have such a Model. It's not my best code, but will do :-) ...
public class SomeTableModel extends AbstractTableModel {
public SomeTableModel(ResultSet rs) {
this.rs = rs;
try {
pos = this.rs.getRow();
System.out.println(String.valueOf(pos));
} catch (SQLException ex) {
JOptionPane.showMessageDialog(null, ex);
}
}
public int getRowCount() {
int cnt = 0;
int apos = 0;
try {
apos = rs.getRow();
rs.last();
cnt = rs.getRow();
if (apos > 0)
rs.absolute(apos);
} catch (SQLException ex) {
System.out.println("getRowCount: " + ex);
}
return cnt;
}
public int getColumnCount() {
return 3;
}
public Object getValueAt(int rowIndex, int columnIndex) {
// make it jump back to pos !!
Object val = null;
Integer intVal;
try {
if (rowIndex == 0) {
pos = rs.getRow();
total = getRowCount();
}
rs.absolute(rowIndex + 1);
switch (columnIndex) {
case 0: intVal = rs.getInt(1); val = intVal; break;
case 1: val = rs.getString(2); break;
case 2: val = rs.getString(3); break;
default: val = "error";
}
rs.absolute(pos);
} catch (SQLException sqle) {
JOptionPane.showMessageDialog(null, "Trouble in model");
}
return val;
}
private ResultSet rs;
private int pos, total;
}
If you are loading the data from a database table, I think the best way to go is to limit the data coming from the database. Then apply a simple algorithm for the next and previous buttons.
My jTable is loaded with data and this is where I call my Pop up functionality on jTable.
jTable.addMouseListener(new TablePopupListener(jTable));
displayTable();
So basically, if I right-click a row, a popup(credit check) comes up and if I click it is setting a value to the last cell in that row. Now, based on this column cell value I have to define the color of a row. Let's say if the cell value fails then turn the row to red else to green. I have tried customCellRenderer and defined my condition but there is no change in row color. The custom cell renderer worked great for a button functionality that I had to write, though. The below code uses prepare cellRenderer which I felt is easy but I don't see any change in row color.
I am missing some connection, plz provide me help.
Thanks in advance.
class TablePopupListener extends MouseAdapter implements ActionListener {
JPopupMenu popup;
JTable table;
int[] selRows;
TableModel model;
ArrayList rowValueList = new ArrayList();
JMenuItem creditCheck = new JMenuItem("Credit Check");
public TablePopupListener(JTable jTable) {
this.table = jTable;
model = table.getModel();
popup = new JPopupMenu();
JMenuItem creditCheck = new JMenuItem("Credit Check");
creditCheck.addActionListener(this);
popup.add(creditCheck);
}
public void mousePressed(MouseEvent me) {
firePopup(me);
}
public void mouseReleased(MouseEvent me) {
firePopup(me);
}
public void firePopup(MouseEvent me) {
/*
* The popup menu will be shown only if there is a row selection in the
* table
*/
// popup.show(table, me.getX(), me.getY());
if (me.isPopupTrigger() && table.getModel().getRowCount() != 0
&& table.getSelectedRow() != -1) {
// popup.show(table,me.getX(),me.getY());
if (me.isPopupTrigger()) {
JTable source = (JTable) me.getSource();
int row = source.rowAtPoint(me.getPoint());
int column = source.columnAtPoint(me.getPoint());
if (!source.isRowSelected(row))
source.changeSelection(row, column, false, false);
popup.show(table, me.getX(), me.getY());
}
}
}
public void actionPerformed(ActionEvent ae) {
if (ae.getActionCommand().equals("Credit Check")) {
System.out.println("you have clicked creditCheckpopup");
selRows = table.getSelectedRows();
if (selRows.length > 0) {
for (int i = 0; i < selRows.length; i++) {
// get Table data
for (int j = 1; j < (table.getColumnCount()) - 1; j++) {
rowValueList.add(model.getValueAt(selRows[i], j));
}
System.out.println("Selection : " + rowValueList);
}
} else {
System.out.println("you have clicked something idiot");
}
int result = new COpxDeal(rowValueList).CheckCredit();
if (result == 1)
rowValueList.add("pass");
else
rowValueList.add("fail");
String aValue = (String) rowValueList.get(14);
for (int i = 0; i < selRows.length; i++) {
model.setValueAt(aValue, selRows[i], 15);
}
// inserted comment (Kleopatra): where are we? that's outside of the TablePopup?
// okay, nothing like copying the code into an IDE and let that do the formatting, silly me ;-)
// this is indeed _inside_ the popup, that is the table is recreated
table = new JTable(model) {
public Component prepareRenderer(TableCellRenderer renderer,
int row, int column) {
Component c = super.prepareRenderer(renderer, row, column);
JComponent jc = (JComponent) c;
// if (!isRowSelected(row)){
// c.setBackground(getBackground());
// System.out.println(isRowSelected(row));
// }
int modelRow = convertRowIndexToModel(row);
String strTestValue = "fail";
String strTblValue = (String) getModel().getValueAt(
modelRow, 15);
System.out.println("result :" + strTblValue);
if (strTblValue == null || strTblValue.equals(""))
System.out.println("there is nothing in strTblValue");
else if (strTestValue.equals(strTblValue)) {
jc.setBackground(Color.RED);
} else {
jc.setBackground(Color.green);
}
return c;
}
};
}
}
}
after some formatting (believe me, it's important for code to be readable ;-) seems like you instantiate a new table inside your popupMenu and only that table has the custom renderer. Which you can do, but doesn't have any effect on the your real table.
Move the prepareRenderer into your real table (the one you pass into the popup as parameter) and you should see the coloring. Beware: due to a bug in DefaultTableCellRenderer, you have to set the color always, that is
if (nothingToDo) {
setBackground(normal)
} else if ... {
setBackground(one)
} else {
setBackground(other)
}
Edit: trying to explain the changes in code structure, pseudo-code snippets
Current state, that's what you are doing:
JTable table = new JTable();
table.addMouseListener(new TablePopupListener(table));
// keep listener-local reference to table
JTable table = table;
....
// in the listener guts, the reference is replaced
table = new JTable() {
#Override
Component prepareRenderer(...
}
Change to, that's what you should do:
JTable table = new JTable() {
#Override
Component prepareRenderer(...
};
table.addMouseListener(new TablePopupListener(table));
// keep listener-local reference to table
JTable table = table;
// don't replace ever, it's for reading only
edit 2:
- changed the pseudo-code to actually register the listener)
- the code indented below the addMouseListener is mean as an outline of the code inside the TablePopupListener
Hi I am currently doing my final year project; I need to develop an algorithm visualization tool. I need to cater for user-defined algo; that is animate the algorithm the user types in a text-editor provided in my tool.
I am using the Java Compiler API to compile the code that the user has typed and saved. My tool offers a set of classes that the user can use in his/her algo.
For example:
myArray(this class is provided by my tool)
import java.awt.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.accessibility.AccessibleContext;
import javax.swing.*;
public class myArray extends JComponent {
int size = 0;
int count = 0;
int[]hold;
Thread th;
public myArray(int[]arr)//pass user array as parameter
{
//th = new Thread();
size=arr.length;
hold = arr;//make a copy of the array so as to use later in swap operation
}
public int length()
{
return hold.length;
}
public void setAccessibleContext(AccessibleContext accessibleContext) {
this.accessibleContext = accessibleContext;
}
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
this.setPreferredSize(new Dimension(360,100));
for(int i=1; i<=size; i++)
{
g2d.drawRect((i*30), 30, 30, 50);
}
for(int i=1; i<=size; i++)
{
g2d.drawString(Integer.toString(hold[i-1]), (i*30)+15, 30+25);
}
}
public void set(int i, int j)//position of the two elements to swap in the array
{
try {
th.sleep(2000);//sleep before swapping because else user won't see original array since it would swap and then sleep
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
int temp = hold[i];
hold[i] = hold[j];
hold[j] = temp;
hold[i]=j;
this.repaint();//can use eapint with a class that extends JPanel
}
public void swap(int i, int j)//position of the two elements to swap in the array
{
try {
th.sleep(2000);//sleep before swapping because else user won't see original array since it would swap and then sleep
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
int temp = hold[i];
hold[i] = hold[j];
hold[j] = temp;
this.repaint();//can use eapint with a class that extends JPanel
}
public int get(int pos)
{
return hold[pos];
}
}
This is a portion of my GUI that will cause the compilation:
JavaCompiler jc = null;
StandardJavaFileManager sjfm = null;
File javaFile = null;
String[] options = null;
File outputDir = null;
URL[] urls = null;
URLClassLoader ucl = null;
Class clazz = null;
Method method = null;
Object object = null;
try
{
jc = ToolProvider.getSystemJavaCompiler();
sjfm = jc.getStandardFileManager(null, null, null);
File[] files = new File[1];
//files[0] = new File("C:/Users/user/Documents/NetBeansProjects/My_Final_Year_Project/myArray.java");
//files[1] = new File("C:/Users/user/Documents/NetBeansProjects/My_Final_Year_Project/Tool.java");
files[0] = new File("C:/Users/user/Documents/NetBeansProjects/My_Final_Year_Project/userDefined.java");
// getJavaFileObjects’ param is a vararg
Iterable fileObjects = sjfm.getJavaFileObjects(files);
jc.getTask(null, sjfm, null, null, null, fileObjects).call();
// Add more compilation tasks
sjfm.close();
options = new String[]{"-d", "C:/Users/user/Documents/NetBeansProjects/My_Final_Year_Project"};
jc.getTask(null, sjfm, null, Arrays.asList(options), null, fileObjects).call();
outputDir = new File("C:/Users/user/Documents/NetBeansProjects/My_Final_Year_Project");
urls = new URL[]{outputDir.toURL()};
ucl = new URLClassLoader(urls);
clazz = ucl.loadClass("userDefined");
method = clazz.getMethod("user", null);
object = clazz.newInstance();
Object ob = method.invoke(object, null);
}
This is an example of a user-defined algo(userDefined.java):
import java.awt.*;
import javax.swing.*;
public class userDefined
{
public void user()
{
int [] numArr = {1,3,1,-1,5,-5,0,7,12,-36};
myArray myArray = new myArray(numArr);
JFrame frame = new JFrame("Rectangles");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setSize(360, 300);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.add(myArray);
for (int i=myArray.length(); i>1; i--)
{
for (int j=0; j<i-1; j++)
{
if (myArray.get(j) > myArray.get(j+1))
{
myArray.swap(j, j+1);
}
}
}
}
}
The problem I am getting is that if I try to use reflection like above; I only get a white window which does not show the animation) but just displays the result at the very end.
However if I use this instead of reflection(and change the method void user() to static void main(string args) in userDefined.java):
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
if(compiler.run(null, null, null, "userDefined.java") != 0) {
System.err.println("Could not compile.");
System.exit(0);
}
try {
Runtime rt = Runtime.getRuntime();
Process pr = rt.exec("java "+"userDefined");
BufferedReader input = new BufferedReader(new InputStreamReader(pr.getInputStream()));
String line=null;
while((line=input.readLine()) != null) {
System.out.println(line);
}
} catch(Exception e) {
System.out.println(e.toString());
e.printStackTrace();
it woks provided that after first compilation I place the myArray class in the same folder as the userDefined.java. In this case I can see the animation take place correctly.
How do I use reflection to invoke the main method instead of using an instance of the class.
Please I really need some help with this. Thanks!
You a violating / missusing the first rule of swing: acces swing components only in the EDT (Event Dispatch Thread).
When you start your program using the main method, you are violating that rule. This happens to work, but might have all kinds of weird effects. This is not a theoretic warning, it happend to me and it is not nice.
When you run it using reflection from your code, you are most likely in the EDT, so your algorithm runs completely before the GUI gets updated again (which also happens on the EDT). Thats why you see only the final result of the algorithm.
The correct way to do this would be:
Run the algorithm in a seperate thread and make sure all changes to your myArray Component happen in the EDT, using SwingUtilities.invokeAndWait or SwingUtilities.invokeLater