我有两个组件类覆盖了public void paint(Graphics g)方法
类：
package com.niton.UI.comps.draggrafix;
import com.niton.usagecomps.draglogic.basic.DragItem;
public abstract class DragItemComp extends JPanel {
private static final long serialVersionUID = -5963637215146534947L;
private DragItem item;
/**
* Height of the content
*/
private int dragHeight = 50;
/**
* Height of the header
*/
private int topHeight = 23;
/**
* width of the content
*/
private int contentSize = 300;
/**
* the width of the bar
*/
private int barWidth = 20;
private int oldX;
private int oldY;
private Rectangle blueBtn = new Rectangle(0, 0, barWidth, topHeight);
private Rectangle redBtn = new Rectangle(contentSize+barWidth, 0, barWidth, topHeight);
private Rectangle namespace = new Rectangle(barWidth, 0, contentSize, topHeight);
private ArrayList<ConnectPoint> redPossible = new ArrayList<>();
private ArrayList<ConnectPoint> bluePossible = new ArrayList<>();
private ArrayList<ConnectPoint> redVisible = new ArrayList<>();
private ArrayList<ConnectPoint> blueVisible = new ArrayList<>();
private ArrayList<ConnectPoint> actual;
private Font f;
private Color contentColor = new Color(getMainColor().getRGB()-50);
public Dimension neededSize = new Dimension(barWidth*2+contentSize, dragHeight+topHeight);
private MouseAdapter butListener = new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if(blueBtn.contains(e.getPoint()))
actual = bluePossible;
else if (redBtn.contains(e.getPoint()))
actual = redPossible;
else{
//TODO do something
return;
}
if(possibleList != null && possibleList.isVisible())
possibleList.dispose();
possibleList = new JFrame();
possibleList.setAlwaysOnTop(true);
possibleList.setType(Type.UTILITY);
possibleList.getContentPane().setBackground(Color.LIGHT_GRAY);
int height = 8;
for (ConnectPoint connectPoint : actual) {
connectPoint.setLocation(15, height);
possibleList.getContentPane().add(connectPoint);
height += connectPoint.getHeight()+8;
possibleList.getContentPane().add(new JSeparator());
}
possibleList.setLocation(e.getLocationOnScreen());
possibleList.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
possibleList.dispose();
}
});
possibleList.setSize(200, height);
possibleList.setUndecorated(true);
possibleList.setVisible(true);
actual = null;
setPreferredSize(neededSize);
}
};
public JFrame possibleList;
public DragItemComp() {
setBackground(new Color(0, 0, 0, 0));
createComps();
addMouseListener(butListener);
f = new Font(getFont().getFontName(), Font.BOLD, 14);
}
public void createComps(){
removeAll();
int h = 0;
for (ConnectPoint connectPoint : blueVisible) {
connectPoint.setLocation(0, h);
h += connectPoint.getHeight()+6;
}
}
public void onMove(){
if(possibleList == null || !possibleList.isVisible()){
System.out.println("Frame == null");
return;
}
if(oldX == 0 && oldY== 0 ){
oldX = getLocationOnScreen().x;
oldY = getLocationOnScreen().y;
}
int tomoveX = getLocationOnScreen().x-oldX;
int tomoveY = getLocationOnScreen().y-oldY;
Point newPoint = possibleList.getLocation();
newPoint.translate(tomoveX, tomoveY);
possibleList.setLocation(newPoint);
possibleList.repaint();
System.gc();
oldX = getLocationOnScreen().x;
oldY = getLocationOnScreen().y;
}
@Override
public void paint(Graphics g) {
super.paint(g);
/*Blue Button*/
g.setColor(Color.BLUE);
g.fillRect(0, 0, barWidth, topHeight);
/*Blue Button*/
/*NameBar*/
g.setColor(getMainColor());
g.fillRect(barWidth, 0, contentSize, topHeight);
/*nameBar*/
/*red Button*/
g.setColor(Color.RED);
g.fillRect(contentSize+barWidth, 0, barWidth, topHeight);
/*Red Button*/
/*Content*/
g.setColor(contentColor);
g.fillRect(barWidth, topHeight, contentSize, dragHeight);
/*Content*/
/*Title*/
g.setColor(Color.BLACK);
g.setFont(f);
int textSize = 14*getTitle().length();
g.drawString(getTitle(), ((contentSize+(2*barWidth))/2)-(textSize/3), 15);
/*Title*/
/*Blue Sidebar*/
g.setColor(Color.BLUE.darker().darker());
g.fillRect(0, topHeight, barWidth, dragHeight);
/*Blue Sidebar*/
/*Red Bar*/
g.setColor(Color.red.darker().darker());
g.fillRect(barWidth+contentSize, topHeight, barWidth, dragHeight);
/*Red Sidebar*/
//SIZE
neededSize = new Dimension(barWidth*2+contentSize, dragHeight+topHeight);
setPreferredSize(neededSize);
System.gc();
}
public abstract Color getMainColor();
public abstract String getTitle();
public class ConnectPoint extends JPanel{
private static final long serialVersionUID = -6834760334640389791L;
boolean out = true;
String text;
private Font f;
public ConnectPoint(String text,Runnable onClick)
{
this.text = text;
setSize(text.length()*getFont().getSize()+20, 15);
setBackground(new Color(0, 0, 0, 0));
addMouseListener(new MouseAdapter(){
@Override
public void mouseClicked(MouseEvent e) {
System.out.println("Click");
new Thread(onClick).start();
DragItemComp.this.redPossible.remove(this);
DragItemComp.this.redVisible.add(ConnectPoint.this);
}
});
addKeyListener(new KeyAdapter() {
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_ESCAPE)
getParent().setVisible(false);
}
});
f = new Font(getParent().getFont().getFontName(), getFont().getStyle(), 12);
}
@Override
public void paint(Graphics g) {
super.paint(g);
if(out)
g.setColor(Color.RED);
else
g.setColor(Color.BLUE);
g.fillOval(0, 0, 10, 10);
g.setColor(Color.BLACK);
g.setFont(f);
g.drawString(text, 15, 11);
}
@Override
public boolean isFocusable() {
return true;
}
@Override
public boolean isFocusTraversable() {
return true;
}
}
}
我知道这是很多代码而且很抱歉 我很长时间以来都试图解决这个问题 在这段时间里，我发现了一些有趣的东西 我认为泄漏是在这个类中：
public class JavaScriptDropFileComponent extends JPanel {
private static final long serialVersionUID = 3535239632114792374L;
private DragJavaScriptFile file;
private String project;
private DragItem nextPlace;
private DragItem selected;
protected JFrame placeFrame;
public JavaScriptDropFileComponent() {
setLayout(new GridLayout(0, 1, 0, 0));
placeFrame = new JFrame();
placeFrame.getContentPane().setLayout(new FlowLayout());
placeFrame.setUndecorated(true);
placeFrame.setOpacity(0.5F);
placeFrame.getContentPane().setBackground(new Color(0, 0, 0, 0));
placeFrame.setType(Type.UTILITY);
placeFrame.setVisible(true);
placeFrame.setAlwaysOnTop(true);
JSplitPane splitPane = new JSplitPane();
add(splitPane);
JPanel panel = new JPanel();
panel.setBackground(Color.BLACK);
splitPane.setLeftComponent(panel);
GridBagLayout gbl_panel = new GridBagLayout();
gbl_panel.columnWidths = new int[]{0, 0};
gbl_panel.rowHeights = new int[]{0, 0, 0, 0, 0, 0, 0};
gbl_panel.columnWeights = new double[]{1.0, Double.MIN_VALUE};
gbl_panel.rowWeights = new double[]{0.0, 0.0, 0.0, 0.0, 0.0, 0.0, Double.MIN_VALUE};
panel.setLayout(gbl_panel);
JLabel lblComponents = new JLabel("Components");
lblComponents.setForeground(Color.LIGHT_GRAY);
lblComponents.setFont(new Font("Roboto Light", Font.PLAIN, 24));
GridBagConstraints gbc_lblComponents = new GridBagConstraints();
gbc_lblComponents.anchor = GridBagConstraints.NORTH;
gbc_lblComponents.insets = new Insets(0, 0, 5, 0);
gbc_lblComponents.gridx = 0;
gbc_lblComponents.gridy = 0;
panel.add(lblComponents, gbc_lblComponents);
JPanel panel_2 = new JPanel();
panel_2.setBorder(new LineBorder(Color.WHITE, 1, true));
panel_2.setBackground(Color.DARK_GRAY);
GridBagConstraints gbc_panel_2 = new GridBagConstraints();
gbc_panel_2.fill = GridBagConstraints.HORIZONTAL;
gbc_panel_2.anchor = GridBagConstraints.NORTH;
gbc_panel_2.insets = new Insets(0, 0, 5, 0);
gbc_panel_2.gridx = 0;
gbc_panel_2.gridy = 2;
panel.add(panel_2, gbc_panel_2);
panel_2.setLayout(new GridLayout(0, 1, 0, 0));
JLabel lblIfelse = new JLabel("If/Else");
panel_2.add(lblIfelse);
lblIfelse.setBorder(new LineBorder(Color.LIGHT_GRAY));
lblIfelse.setFont(new Font("SansSerif", Font.PLAIN, 23));
lblIfelse.setForeground(Color.WHITE);
JButton btnIfCondrtion = new JButton("If Condrtion");
btnIfCondrtion.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
nextPlace = new BasicIfCondition();
placeFrame.getContentPane().removeAll();
DragItemComp c = nextPlace.getComponent();
c.setLocation(0, 0);
c.setSize(c.getPreferredSize());
placeFrame.getContentPane().add(c);
placeFrame.setSize(0,0);
}
});
btnIfCondrtion.setSelected(true);
panel_2.add(btnIfCondrtion);
JButton btnCompareCondition = new JButton("Compare Condition");
btnCompareCondition.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
nextPlace = new CompairCondition();
placeFrame.getContentPane().removeAll();
DragItemComp c = nextPlace.getComponent();
c.setLocation(0, 0);
c.setSize(c.getPreferredSize());
placeFrame.getContentPane().add(c);
placeFrame.setSize(0,0);
}
});
panel_2.add(btnCompareCondition);
Button btnFunctionCondition = new Button((String) null);
btnFunctionCondition.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
btnFunctionCondition.setText("Function Condition");
panel_2.add(btnFunctionCondition);
JButton btnCombinedCondition = new JButton("Combined Condition");
btnCombinedCondition.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
nextPlace = new CombinorCondition();
placeFrame.getContentPane().removeAll();
DragItemComp c = nextPlace.getComponent();
c.setLocation(0, 0);
c.setSize(c.getPreferredSize());
placeFrame.getContentPane().add(c);
placeFrame.setSize(0,0);
}
});
panel_2.add(btnCombinedCondition);
JPanel panel_3 = new JPanel();
panel_3.setBorder(new LineBorder(Color.WHITE, 1, true));
panel_3.setBackground(Color.DARK_GRAY);
GridBagConstraints gbc_panel_3 = new GridBagConstraints();
gbc_panel_3.fill = GridBagConstraints.HORIZONTAL;
gbc_panel_3.insets = new Insets(0, 0, 5, 0);
gbc_panel_3.anchor = GridBagConstraints.NORTH;
gbc_panel_3.gridx = 0;
gbc_panel_3.gridy = 3;
panel.add(panel_3, gbc_panel_3);
panel_3.setLayout(new GridLayout(0, 1, 0, 0));
JLabel lblGlobal = new JLabel("Global");
panel_3.add(lblGlobal);
lblGlobal.setBorder(new LineBorder(Color.WHITE));
lblGlobal.setFont(new Font("SansSerif", Font.PLAIN, 23));
lblGlobal.setForeground(Color.WHITE);
JButton btnFunction = new JButton("Function");
btnFunction.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
nextPlace = new JavaScriptFunktion();
placeFrame.getContentPane().removeAll();
DragItemComp c = nextPlace.getComponent();
c.setLocation(0, 0);
c.setSize(c.getPreferredSize());
placeFrame.getContentPane().add(c);
placeFrame.setSize(0,0);
}
});
panel_3.add(btnFunction);
JButton btnEvent = new JButton("Event");
btnEvent.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
nextPlace = new EventItem();
placeFrame.getContentPane().removeAll();
DragItemComp c = nextPlace.getComponent();
c.setLocation(0, 0);
c.setSize(c.getPreferredSize());
placeFrame.getContentPane().add(c);
placeFrame.setSize(0,0);
}
});
panel_3.add(btnEvent);
JButton btnValue = new JButton("Value");
btnValue.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
panel_3.add(btnValue);
JButton btnVariable = new JButton("Variable");
btnVariable.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
nextPlace = new JavaScriptVariable();
placeFrame.getContentPane().removeAll();
DragItemComp c = nextPlace.getComponent();
c.setLocation(0, 0);
c.setSize(c.getPreferredSize());
placeFrame.getContentPane().add(c);
placeFrame.setSize(0,0);
}
});
panel_3.add(btnVariable);
JPanel panel_4 = new JPanel();
panel_4.setBorder(new LineBorder(Color.WHITE, 1, true));
panel_4.setBackground(Color.DARK_GRAY);
GridBagConstraints gbc_panel_4 = new GridBagConstraints();
gbc_panel_4.fill = GridBagConstraints.HORIZONTAL;
gbc_panel_4.insets = new Insets(0, 0, 5, 0);
gbc_panel_4.anchor = GridBagConstraints.NORTH;
gbc_panel_4.gridx = 0;
gbc_panel_4.gridy = 4;
panel.add(panel_4, gbc_panel_4);
panel_4.setLayout(new GridLayout(0, 1, 0, 0));
JLabel lblActions = new JLabel("Actions");
panel_4.add(lblActions);
lblActions.setForeground(Color.WHITE);
lblActions.setFont(new Font("SansSerif", Font.PLAIN, 23));
lblActions.setBorder(new LineBorder(Color.WHITE));
JButton btnChangeVariable = new JButton("Change Variable");
btnChangeVariable.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
panel_4.add(btnChangeVariable);
JButton btnCallFunction = new JButton("Call Function");
panel_4.add(btnCallFunction);
JPanel panel_5 = new JPanel();
panel_5.setBorder(new LineBorder(Color.WHITE, 1, true));
panel_5.setBackground(Color.DARK_GRAY);
GridBagConstraints gbc_panel_5 = new GridBagConstraints();
gbc_panel_5.anchor = GridBagConstraints.NORTH;
gbc_panel_5.fill = GridBagConstraints.HORIZONTAL;
gbc_panel_5.gridx = 0;
gbc_panel_5.gridy = 5;
panel.add(panel_5, gbc_panel_5);
panel_5.setLayout(new GridLayout(0, 1, 0, 0));
JLabel label = new JLabel("Loops");
panel_5.add(label);
label.setForeground(Color.WHITE);
label.setFont(new Font("SansSerif", Font.PLAIN, 23));
label.setBorder(new LineBorder(Color.WHITE));
JButton btnFor = new JButton("For");
panel_5.add(btnFor);
JButton btnForEach = new JButton("For Each");
panel_5.add(btnForEach);
Button btnWhile = new Button((String) null);
btnWhile.setText("while");
panel_5.add(btnWhile);
JButton btnTimeLoop = new JButton("Time Loop");
panel_5.add(btnTimeLoop);
JPanel desingerPanel = new JPanel();
splitPane.setRightComponent(desingerPanel);
JPanel tryIt = new JPanel();
tryIt.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
if(nextPlace == null)
return;
DragItemComp comp = nextPlace.getComponent();
nextPlace = null;
comp.setLocation(e.getPoint());
comp.setSize(comp.neededSize);
tryIt.add(comp);
tryIt.validate();
tryIt.repaint();
for(Component c : tryIt.getComponents()){
System.out.println(c);
}
}
});
GroupLayout gl_desingerPanel = new GroupLayout(desingerPanel);
gl_desingerPanel.setHorizontalGroup(
gl_desingerPanel.createParallelGroup(Alignment.LEADING)
.addGroup(Alignment.TRAILING, gl_desingerPanel.createSequentialGroup()
.addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(tryIt, GroupLayout.PREFERRED_SIZE, 961, GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
gl_desingerPanel.setVerticalGroup(
gl_desingerPanel.createParallelGroup(Alignment.LEADING)
.addGroup(gl_desingerPanel.createSequentialGroup()
.addComponent(tryIt, GroupLayout.PREFERRED_SIZE, 776, GroupLayout.PREFERRED_SIZE)
.addContainerGap(GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
tryIt.setLayout(null);
desingerPanel.setLayout(gl_desingerPanel);
new Thread(new Runnable() {
@Override
public void run() {
//Will change this soon
while(isVisible()){
try {
Thread.sleep(10000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(nextPlace == null || !tryIt.isVisible()){
if(placeFrame.isVisible())
placeFrame.setVisible(false);
continue;
}
Point p = MouseInfo.getPointerInfo().getLocation();
if(!new Rectangle(tryIt.getLocationOnScreen(),tryIt.getSize()).contains(p))
{
if(placeFrame.isVisible())
placeFrame.setVisible(false);
continue;
}
else{
if(!placeFrame.isVisible())
placeFrame.setVisible(true);
}
placeFrame.setLocation(p);
if(placeFrame.getHeight() < 20)
placeFrame.setSize(nextPlace.getComponent().neededSize);
}
}
}).start();
}
}
为了缩短我删除了getter / setter并导入。
一个有趣的事实是，当我设置nextPlace（按下一个按钮）时，CPU使用量会增加，而对于每个DragItem，程序需要15％-25％的CPU。
那为什么它需要这么多的CPU，我该如何改变呢？
另一个有趣的事实是CPU使用率并不取决于线程的休眠时间。我尝试了100000,1000,10,1毫秒。它没有改变任何东西！
我uploaded您需要执行的所有类。 - ＆GT; DragTester.java是主类 您是否需要更改“package com.niton。**”decalration 我更新了需要较少CPU的代码。
答案 0 :(得分：4)
简单的答案是：在你的绘画方法中，不要做比你必须做的更多的工作。
快速浏览一下，您每次调用paint时都会创建一个新Font并调用setPreferredSize。
创建一次Font并缓存它并从paint方法中引用它。
另外，在paint方法之外调用setPreferredSize。