java中做一個按鈕，點擊按鈕后畫一個矩形的代碼怎么寫？

兄弟幫你寫了一個：

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import java.awt.Button;

import java.awt.Color;

import java.awt.Frame;

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.util.Random;

public class Print {

public static void main(String[] args) {

new Te();

}

}

class Te extends Frame implements ActionListener {

Color cc = Color.red;

int x = -20, y = -50;

Random r = new Random();

public Te() {

this.setLayout(null);

Button b = new Button("畫圓");

this.add(b);

b.setBounds(30,30,50,50);

b.addActionListener(this);

this.addWindowListener(new WindowAdapter () {

@Override

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

this.setBounds(200,200,500,400);

this.setVisible(true);

}

public void actionPerformed(ActionEvent e) {

this.cc = Color.red;

this.x = r.nextInt(400);

do {

int x1 = r.nextInt(300);

this.y = x1;

} while (this.y 50);

this.repaint();

}

@Override

public void paint(Graphics g) {

Color c = g.getColor();

g.setColor(cc);

g.drawRect(x,y,50,50);

g.setColor(c);

}

}

編寫Java Applet程序畫圓 矩形和直線，繼承實現（多態實現）各個類都能實現構造方法

PainterPanel.java 代碼:

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*;

public class PainterPanel extends JPanel implements MouseListener{

int shape=-1; //圖案類型

Point[] point=new Point[2]; //記錄鼠標拖動的起始點和終點

public PainterPanel(){

super(); //調用父類構造函數

this.setBackground(Color.white); //設置背景顏色

point[0]=new Point(-1,-1); //初始化變量

point[1]=new Point(-1,-1);

addMouseListener(this); //增加鼠標事件

}

public void mouseReleased(MouseEvent e){ //鼠標釋放事件

point[1]=new Point(e.getX(),e.getY()); //設置終點位置

repaint(); //重繪屏幕

}

public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

public void mouseClicked(MouseEvent e){}

public void mousePressed(MouseEvent e){ //鼠標按下時事件

point[0]=new Point(e.getX(),e.getY()); //設置起始點位置

}

public void paint(Graphics g){

super.paint(g);

switch (shape){ //根據shape值繪制圖形

case 0:

g.drawLine(point[0].x,point[0].y,point[1].x,point[1].y); //繪線

break;

case 1:

int width=point[1].x-point[0].x;

int height=point[1].y-point[0].y;

g.drawOval(point[0].x,point[0].y,width,height); //繪橢圓

break;

case 2:

width=point[1].x-point[0].x;

height=point[1].y-point[0].y;

g.drawRect(point[0].x,point[0].y,width,height); //繪矩形

break;

}

}

public void drawShape(int shape){

this.shape=shape;

}

}

PainterDemo.java 代碼

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*;

class PainterPanel extends JPanel implements MouseListener

{

int shape = -1; //圖案類型

Point point[] = new Point[2]; //記錄鼠標拖動的起始點和終點

public PainterPanel ()

{

super ();

this.setBackground(Color.white);//設置背景顏色

point[0] = new Point (-1, -1);//初始化變量

point[1] = new Point (-1, -1);

addMouseListener (this);//增加鼠標事件

}

public void mouseReleased(MouseEvent e)//鼠標釋放事件

{

point[1]=new Point(e.getX(),e.getY()); //設置終點位置

repaint(); //重繪屏幕

}

public void mouseEntered (MouseEvent e){}

public void mouseExited (MouseEvent e){}

public void mouseClicked (MouseEvent e){}

public void mousePressed (MouseEvent e) //鼠標按下時事件

{

point[0] = new Point(e.getX(), e.getY()); //設置起始點位置

}

public void paint(Graphics g)

{

super.paint(g);

switch (shape) //根據shape值繪制圖形

{

case 0:

g.drawLine (point[0].x, point[0].y, point[1].x, point[1].y); //繪線

break;

case 1:

int width = point[1].x - point[0].x;

int height= point[1].y - point[0].y;

g.drawOval (point[0].x, point[0].y, width, height); //繪橢圓

break;

case 2:

width = point[1].x - point[0].x;

height = point[1].y - point[0].y;

g.drawRect(point[0].x, point[0].y, width, height); //繪矩形

break;

}

}

public void drawShape(int shape)

{

this.shape=shape;

}

}

public class PainterDemo extends JFrame

{

JButton[] button = new JButton[3]; //按鈕組 創建最初未選定的切換按鈕，不設置文本或圖像。

PainterPanel painter = new PainterPanel(); //繪圖面板

public PainterDemo()

{

super("Java畫圖程序"); //調用父類構造函數

String[] buttonName = {"直線", "橢圓", "矩形"}; //按鈕文字

DrawShapeListener buttonListener = new DrawShapeListener(); //按鈕事件

JToolBar toolBar = new JToolBar(); //實例化工具欄

ButtonGroup buttonGroup = new ButtonGroup(); //實例化按鈕組

for (int i = 0; i button.length; i ++)

{

button[i] = new JButton (buttonName[i]); //實例化按鈕

button[i].addActionListener (buttonListener); //增加按鈕事件處理

buttonGroup.add(button[i]); //增加按鈕到按鈕組

toolBar.add(button[i]); //增加按鈕到工具欄

}

Container container=getContentPane(); //得到窗口容器

container.add (toolBar,BorderLayout.NORTH); //增加組件到容器上

container.add (painter,BorderLayout.CENTER);

setSize(300,200); //設置窗口尺寸

setVisible(true); //設置窗口為可視

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //關閉窗口時退出程序

}

class DrawShapeListener implements ActionListener //按鈕事件處理

{

public void actionPerformed(ActionEvent e)

{

for (int i = 0; i button.length; i ++)

{

if (e.getSource() == button[i]) //判斷來自于哪個按鈕

{

painter.drawShape(i); //繪制圖形

}

}

}

}

public static void main(String[] args)

{

new PainterDemo();

}

}

求一個java程序：繪圖程序包括畫圓，橢圓，線，矩形，自定義。并且可以調圖形顏色！

public?enum?ShapeTypes?{

LINE,?CIRCLE,?RECTANGLE

}

public?interface?Shape?{

void?paint(Graphics?g);

}

public?class?Rectangle?implements?Shape?{

//?矩形左上角的坐標

private?int?x,?y;

//?矩形的寬度和高度

private?int?width,?height;

private?Color?rectangleColor;

public?Rectangle()?{

super();

}

public?Rectangle(int?x,?int?y,?int?width,?int?height,?Color?rectangleColor)?{

super();

this.x?=?x;

this.y?=?y;

this.width?=?width;

this.height?=?height;

this.rectangleColor?=?rectangleColor;

}

@Override

public?void?paint(Graphics?g)?{

g.setColor(rectangleColor);

g.drawRect(x,?y,?width,?height);

}

}

public?class?Line?implements?Shape?{

//?直線的起始位置

private?int?x1,?y1;

//?直線的終止位置

private?int?x2,?y2;

private?Color?lineColor;

public?Line(int?x1,?int?y1,?int?x2,?int?y2,?Color?lineColor)?{

super();

this.x1?=?x1;

this.y1?=?y1;

this.x2?=?x2;

this.y2?=?y2;

this.lineColor?=?lineColor;

}

public?Line()?{

super();

}

@Override

public?void?paint(Graphics?g)?{

g.setColor(lineColor);

g.drawLine(x1,?y1,?x2,?y2);

}

}

public?class?Circle?implements?Shape?{

//?圓的顏色

private?Color?circleColor;

//?圓心的坐標

private?int?x,?y;

//?圓的半徑

private?int?radius;

public?Circle()?{

super();

}

public?Circle(int?x,?int?y,?int?radius,?Color?circleColor)?{

super();

this.circleColor?=?circleColor;

this.x?=?x;

this.y?=?y;

this.radius?=?radius;

}

@Override

public?void?paint(Graphics?g)?{

g.setColor(circleColor);

//?畫弧,?當弧的寬度和高度一致且從0~360度時就是原形了

g.drawArc(x,?y,?radius,?radius,?0,?360);

}

}

public?class?SketchpadPanel?extends?Canvas?implements?MouseListener,?MouseMotionListener?{

private?static?final?long?serialVersionUID?=?-5229161042153132522L;

//?鼠標點擊起始坐標和當前坐標

private?int?beginX?=?0,?beginY?=?0,?currentX?=?0,?currentY?=?0;

//?判斷鼠標是否被按下

private?boolean?isMousePressing?=?false;

//?保存當前的圖形,?在撤銷和恢復時使用

private?final?StackShape?currentShapes?=?new?StackShape();

//?保存已經刪除過的圖形

private?final?StackShape?deletedShapes?=?new?StackShape();

private?ShapeTypes?type;

private?Color?color;

public?SketchpadPanel()?{

addMouseListener(this);

addMouseMotionListener(this);

}

/**

?*?撤銷方法

?*/

public?void?undo()?{

if?(currentShapes.size()??0)?{

//?從所有保存過的圖形中取出最后一個,?放入到已刪除的圖形中去

Shape?shape?=?currentShapes.pop();

deletedShapes.push(shape);

repaint();

}

}

/**

?*?恢復撤銷方法

?*/

public?void?redo()?{

if?(deletedShapes.size()??0)?{

//?從所有刪除的圖形中取出最后一個,?放入保存的圖形中

Shape?shape?=?deletedShapes.pop();

currentShapes.push(shape);

repaint();

}

}

/**

?*?設置命令

?*?

?*?@param?type

?*/

public?void?setShapeType(ShapeTypes?type)?{

this.type?=?type;

}

/**

?*?設置顏色

?*?

?*?@param?color

?*/

public?void?setColor(Color?color)?{

this.color?=?color;

}

public?void?updete(Graphics?g)?{

paint(g);

}

/**

?*?繪制畫板

?*/

@Override

public?void?paint(Graphics?g)?{

//?繪制畫板

Dimension?size?=?getSize();

int?width?=?size.width;

int?height?=?size.height;

g.setColor(Color.WHITE);

g.fillRect(0,?0,?width,?height);

//?繪制所有圖形

Shape?shape?=?null;

EnumerationShape?e?=?currentShapes.elements();

while?(e.hasMoreElements())?{

shape?=?e.nextElement();

shape.paint(g);

}

//?如果當前鼠標沒有釋放

if?(isMousePressing)?{

g.setColor(color);

switch?(type)?{

//?繪制直線

case?LINE:

g.drawLine(beginX,?beginY,?currentX,?currentY);

break;

//?繪制矩形

case?RECTANGLE:

if?(currentX??beginX)?{

if?(currentY??beginY)?{

//?如果當前位置在起始位置的左上方,?則以鼠標當前位置為矩形的左上角位置

g.drawRect(currentX,?currentY,?beginX?-?currentX,?beginY?-?currentY);

}?else?{

//?如果當前位置在起始位置的左下方,?則以鼠標當前位置的橫坐標和起始位置的縱坐標作為矩形的左上角位置

g.drawRect(currentX,?beginY,?beginX?-?currentX,?currentY?-?beginY);

}

}?else?{

if?(currentY??beginY)?{

//?如果當前位置在起始位置的右上方,?則以鼠標起始位置的很坐標和當前位置的縱坐標作為矩形的左上角位置

g.drawRect(beginX,?currentY,?currentX?-?beginX,?beginY?-?currentY);

}?else?{

//?如果當前位置在起始位置的右下方,?則已起始位置作為矩形的左上叫位置

g.drawRect(beginX,?beginY,?currentX?-?beginX,?currentY?-?beginY);

}

}

break;

//?繪制圓形

case?CIRCLE:

//?半徑為a*a?+?b*b的平方根

int?radius?=?(int)?Math

.sqrt((beginX?-?currentX)?*?(beginX?-?currentX)?+?(beginY?-?currentY)?*?(beginY?-?currentY));

g.drawArc(beginX?-?radius?/?2,?beginY?-?radius?/?2,?radius,?radius,?0,?360);

break;

}

}

}

@Override

public?void?mouseClicked(MouseEvent?e)?{

}

@Override

public?void?mouseEntered(MouseEvent?e)?{

}

@Override

public?void?mouseExited(MouseEvent?e)?{

}

/**

?*?當鼠標按下的時候獲得起始坐標

?*/

@Override

public?void?mousePressed(MouseEvent?e)?{

beginX?=?e.getX();

beginY?=?e.getY();

isMousePressing?=?true;

}

/**

?*?當鼠標釋放時獲得當前坐標

?*/

@Override

public?void?mouseReleased(MouseEvent?e)?{

currentX?=?e.getX();

currentY?=?e.getY();

isMousePressing?=?false;

//?當釋放鼠標時,?將繪制的圖形保存到shapes中

switch?(type)?{

//?繪制直線

case?LINE:

Line?line?=?new?Line(beginX,?beginY,?currentX,?currentY,?color);

currentShapes.push(line);

break;

//?繪制圓形

case?CIRCLE:

//?半徑為a*a?+?b*b的平方根

int?radius?=?(int)?Math

.sqrt((beginX?-?currentX)?*?(beginX?-?currentX)?+?(beginY?-?currentY)?*?(beginY?-?currentY));

Circle?circle?=?new?Circle(beginX?-?radius?/?2,?beginY?-?radius?/?2,?radius,?color);

currentShapes.push(circle);

break;

//?繪制矩形

case?RECTANGLE:

Rectangle?rectangle?=?null;

if?(currentX??beginX)?{

if?(currentY??beginY)?{

rectangle?=?new?Rectangle(currentX,?currentY,?beginX?-?currentX,?beginY?-?currentY,?color);

}?else?{

rectangle?=?new?Rectangle(currentX,?beginY,?beginX?-?currentX,?currentY?-?beginY,?color);

}

}?else?{

if?(currentY??beginY)?{

rectangle?=?new?Rectangle(beginX,?currentY,?currentX?-?beginX,?beginY?-?currentY,?color);

}?else?{

rectangle?=?new?Rectangle(beginX,?beginY,?currentX?-?beginX,?currentY?-?beginY,?color);

}

}

currentShapes.push(rectangle);

break;

}

repaint();

}

@Override

public?void?mouseDragged(MouseEvent?e)?{

currentX?=?e.getX();

currentY?=?e.getY();

this.repaint();

}

@Override

public?void?mouseMoved(MouseEvent?e)?{

}

}

public?class?SketchpadFrame?extends?JFrame?{

private?static?final?long?serialVersionUID?=?-7080053971741609904L;

private?final?JPanel?commandPanel?=?new?JPanel();?//?存放命令的面板

private?final?JPanel?colorPanel?=?new?JPanel();?//?存放顏色的面板

private?final?JPanel?mainPanel?=?new?JPanel();?//?主面板

private?final?JButton?redButton?=?new?JButton("紅色");

private?final?JButton?blueButton?=?new?JButton("藍色");

private?final?JButton?greenButton?=?new?JButton("綠色");

private?final?JButton?lineButton?=?new?JButton("直線");

private?final?JButton?circleButton?=?new?JButton("圓");

private?final?JButton?rectangleButton?=?new?JButton("矩形");

private?final?JButton?undoButton?=?new?JButton("撤銷");

private?final?JButton?redoButton?=?new?JButton("恢復撤銷");

private?final?JButton?exitButton?=?new?JButton("退出");

SketchpadPanel?sketchPanel?=?new?SketchpadPanel();

private?void?initFrame()?{

commandPanel.setLayout(new?FlowLayout());

commandPanel.add(lineButton);

commandPanel.add(circleButton);

commandPanel.add(rectangleButton);

commandPanel.add(undoButton);

commandPanel.add(redoButton);

commandPanel.add(exitButton);

colorPanel.setLayout(new?FlowLayout());

colorPanel.add(redButton);

colorPanel.add(blueButton);

colorPanel.add(greenButton);

mainPanel.setLayout(new?BorderLayout());

mainPanel.add(commandPanel,?BorderLayout.NORTH);

mainPanel.add(colorPanel,?BorderLayout.CENTER);

getContentPane().add("South",?mainPanel);

getContentPane().add("Center",?sketchPanel);

//?初始化設置:顏色和命令

lineButton.setForeground(Color.RED);

sketchPanel.setColor(Color.RED);

redButton.setForeground(Color.RED);

sketchPanel.setShapeType(ShapeTypes.LINE);

}

private?void?initListener()?{

redButton.addActionListener(new?ActionListener()?{

@Override

public?void?actionPerformed(ActionEvent?e)?{

redAction(e);

}

});

blueButton.addActionListener(new?ActionListener()?{

@Override

public?void?actionPerformed(ActionEvent?e)?{

blueAction(e);

}

});

greenButton.addActionListener(new?ActionListener()?{

@Override

public?void?actionPerformed(ActionEvent?e)?{

greenAction(e);

}

});

undoButton.addActionListener(new?ActionListener()?{

@Override

public?void?actionPerformed(ActionEvent?e)?{

undoAction(e);

}

});

redoButton.addActionListener(new?ActionListener()?{

@Override

public?void?actionPerformed(ActionEvent?e)?{

redoAction(e);

}

});

exitButton.addActionListener(new?ActionListener()?{

@Override

public?void?actionPerformed(ActionEvent?e)?{

exitAction(e);

}

});

lineButton.addActionListener(new?ActionListener()?{

@Override

public?void?actionPerformed(ActionEvent?e)?{

lineAction(e);

}

});

circleButton.addActionListener(new?ActionListener()?{

@Override

public?void?actionPerformed(ActionEvent?e)?{

circleAction(e);

}

});

rectangleButton.addActionListener(new?ActionListener()?{

@Override

public?void?actionPerformed(ActionEvent?e)?{

rectangleAction(e);

}

});

}

public?SketchpadFrame()?{

initFrame();

initListener();

this.setSize(500,?600);

setLocationByPlatform(true);

setResizable(true);

}

/*?********************處理事件*********************?*/

private?void?undoAction(ActionEvent?e)?{

sketchPanel.undo();

}

private?void?redoAction(ActionEvent?e)?{

sketchPanel.redo();

}

private?void?exitAction(ActionEvent?e)?{

System.exit(0);

}

private?void?lineAction(ActionEvent?e)?{

//?選中按鈕為紅色,?其余為黑色

lineButton.setForeground(Color.RED);

circleButton.setForeground(Color.BLACK);

rectangleButton.setForeground(Color.BLACK);

sketchPanel.setShapeType(ShapeTypes.LINE);

}

private?void?circleAction(ActionEvent?e)?{

circleButton.setForeground(Color.RED);

lineButton.setForeground(Color.BLACK);

rectangleButton.setForeground(Color.BLACK);

sketchPanel.setShapeType(ShapeTypes.CIRCLE);

}

private?void?rectangleAction(ActionEvent?e)?{

rectangleButton.setForeground(Color.RED);

lineButton.setForeground(Color.BLACK);

circleButton.setForeground(Color.BLACK);

sketchPanel.setShapeType(ShapeTypes.RECTANGLE);

}

private?void?redAction(ActionEvent?e)?{

redButton.setForeground(Color.RED);

blueButton.setForeground(Color.BLACK);

greenButton.setForeground(Color.BLACK);

sketchPanel.setColor(Color.RED);

}

private?void?blueAction(ActionEvent?e)?{

blueButton.setForeground(Color.RED);

redButton.setForeground(Color.BLACK);

greenButton.setForeground(Color.BLACK);

sketchPanel.setColor(Color.BLUE);

}

private?void?greenAction(ActionEvent?e)?{

greenButton.setForeground(Color.RED);

redButton.setForeground(Color.BLACK);

blueButton.setForeground(Color.BLACK);

sketchPanel.setColor(Color.GREEN);

}

}

/**

*?

*?@author?不落的太陽(Sean?Yang)

*?@version?1.0

*?@since?JDK?1.8

*?

*/

public?class?SketchpadMain?{

/**

?*?測試方法

?*?

?*?@param?args命令行參數

?*/

public?static?void?main(String[]?args)?{

EventQueue.invokeLater(new?Runnable()?{

@Override

public?void?run()?{

JFrame?frame?=?new?SketchpadFrame();

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

});

}

}

JAVA怎么畫出一個任意大小的圓形和矩形

package?test.xxl;

import?java.awt.Button;

import?java.awt.Color;

import?java.awt.Cursor;

import?java.awt.Graphics;

import?java.awt.event.ActionEvent;

import?java.awt.event.ActionListener;

import?java.awt.event.MouseEvent;

import?java.awt.event.MouseListener;

import?javax.swing.JFrame;

public?class?Demo0617?extends?JFrame?implements?MouseListener,ActionListener{

private?static?int?x?=?0?;?

private?static?int?y?=?0?;

private?static?int?w?=?0?;

private?static?int?h?=?0?;

private?static?Color?c?;

//?真為圓，假為方

private?boolean?flag?=?false?;

private?static?final?long?serialVersionUID?=?1L;

public?Demo0617(){

this.setSize(440,?500)?;

this.setVisible(true)?;

this.setLayout(null)?;

this.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR))?;

this.setResizable(false);//不能改變窗體大小

this.setBackground(Color.WHITE)?;

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)?;

this.addMouseListener(this)?;

this.getContentPane().setBackground(Color.WHITE)?;

Button?b1,b2,b3,b4,b5,b6,b7,b8,b9?;

b1?=?new?Button("紅色")?;

b1.setBounds(0,?0,?100,?30)?;

b1.setBackground(Color.RED)?;

b1.addActionListener(this)?;

this.add(b1)?;

b2?=?new?Button("黑色")?;

b2.setBounds(110,?0,?100,?30)?;

b2.setBackground(Color.BLACK)?;

b2.addActionListener(this)?;

this.add(b2)?;

b3?=?new?Button("黃色")?;

b3.setBounds(220,?0,?100,?30)?;

b3.setBackground(Color.YELLOW)?;

b3.addActionListener(this)?;

this.add(b3)?;

b4?=?new?Button("藍色")?;

b4.setBackground(Color.BLUE)?;

b4.setBounds(330,?0,?100,?30)?;

b4.addActionListener(this)?;

this.add(b4)?;

b5?=?new?Button("橡皮擦")?;

b5.setBounds(0,?40,?100,?30)?;

b5.addActionListener(this)?;

this.add(b5)?;

b6?=?new?Button("撤銷")?;

b6.setBounds(110,?40,?100,?30)?;

b6.addActionListener(this)?;

this.add(b6)?;

b7?=?new?Button("全部刪除")?;

b7.setBounds(220,?40,?100,?30)?;

b7.addActionListener(this)?;

this.add(b7)?;

b8?=?new?Button("圓形")?;

b8.setBounds(0,?80,?100,?30)?;

b8.addActionListener(this)?;

this.add(b8)?;

b9?=?new?Button("矩形")?;

b9.setBounds(110,?80,?100,?30)?;

b9.addActionListener(this)?;

this.add(b9)?;

}

/**

?*?@param?args

?*/

public?static?void?main(String[]?args)?{

new?Demo0617()?;

}

@Override

public?void?paint(Graphics?g)?{

if(c?==?null)

c?=?g.getColor();

g.setColor(c);

if(flag){

g.fillOval(x,?y,?w,?h);

}?else?{

g.fillRect(x,?y,?w,?h)?;

}

}

public?void?clear(Graphics?g){

g.setColor(Color.WHITE)?;

g.clearRect(0,?0,?440,?500)?;

}

/**

?*?單擊

?*/

@Override

public?void?mouseClicked(MouseEvent?e)?{

}

/**

?*?按下

?*/

@Override

public?void?mousePressed(MouseEvent?e)?{

x?=?e.getX()?;

y?=?e.getY()?;

}

/**

?*?松開

?*/

@Override

public?void?mouseReleased(MouseEvent?e)?{

int?x?=?e.getX()?;

int?y?=?e.getY()?;

if(x??this.x){

w?=?x?-?this.x?;

}?else?{

w?=?this.x?-?x?;

}

if(y??this.y){

h?=?y?-?this.y?;

}?else?{

h?=?this.y?-?y?;

}

paint(getGraphics())?;

}

/**

?*?鼠標進入事件

?*/

@Override

public?void?mouseEntered(MouseEvent?e)?{

}

/**

?*?鼠標移除事件

?*/

@Override

public?void?mouseExited(MouseEvent?e)?{

}

@Override

public?void?actionPerformed(ActionEvent?e)?{

switch?(e.getActionCommand().hashCode())?{

case?1038352:

//?紅色

c?=?Color.RED?;

break;

case?1293761:

//?黑色

c?=?Color.BLACK?;

break;

case?1293358:

//?黃色

c?=?Color.YELLOW?;

break;

case?1087797:

//?藍色

c?=?Color.BLUE?;

break;

case?27138585:

//?橡皮擦

c?=?Color.WHITE?;

break?;

case?836828:

Graphics?graphics?=?getGraphics()?;

graphics.setColor(Color.WHITE)?;

if(flag){

graphics.fillOval(x,?y,?w,?h)?;

}?else?{

graphics.fillRect(x,?y,?w,?h)?;

}

break;

case?657183940:

//?全部刪除

clear(getGraphics())?;

break;

case?715036:

//?圓形

flag?=?true?;

break;

case?976025:

//?矩形

flag?=?false?;

break;

default:

System.out.println(e.getActionCommand().hashCode());

break?;

}

}

}