java画图板求一个简单的java画板程序 800行这样的

求java版画图程序的源代码

找到了，很久以前写的一个简单画图，呵呵～当时要求用AWT写，很难受。

.miqiang.gui; import java.awt.BasicStroke; import java.awt.BorderLayout; import java.awt.Button; import java.awt.Color; import java.awt.Cursor; import java.awt.Dimension; import java.awt.Frame; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.GridLayout; import java.awt.Label; import java.awt.Panel; import java.awt.RenderingHints; import java.awt.Toolkit; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import java.awt.event.MouseMotionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.image.BufferedImage; /** * 简单画图板程序 * 好久没用 AWT 了，写起来真别扭，如果用 swing 会很舒服，有空再改写吧。

* * @author 米强 * */ public class TestMain extends Frame { // 画板 private Palette palette = null; // 显示当前颜色的面板 private Panel nonceColor = null; // 画笔粗细 private Label drawWidth = null; // 画笔端点的装饰 private Label drawCap = null; // 选取颜色按钮的监听事件类 private ButtonColorAction buttonColorAction = null; // 鼠标进入按钮后光标样式的监听事件类 private ButtonCursor buttonCursor = null; // 画笔样式的监听事件 private ButtonStrokeAction buttonStrokeAction = null; /** * 构造方法 * */ public TestMain() { // 设置标题栏文字 super("简易画图板"); // 构造一个画图板 palette = new Palette(); Panel pane = new Panel(new GridLayout(2, 1)); // 画笔颜色选择器 Panel paneColor = new Panel(new GridLayout(1, 13)); // 12 个颜色选择按钮 Button [] buttonColor = new Button[12]; Color [] color = {Color.black, Color.blue, Color.cyan, Color.darkGray, Color.gray, Color.green, Color.magenta, Color.orange, Color.pink, Color.red, Color.white, Color.yellow}; // 显示当前颜色的面板 nonceColor = new Panel(); nonceColor.setBackground(Color.black); paneColor.add(nonceColor); buttonColorAction = new ButtonColorAction(); buttonCursor = new ButtonCursor(); for(int i = 0; i < buttonColor.length; i++){ buttonColor[i] = new Button(); buttonColor[i].setBackground(color[i]); buttonColor[i].addActionListener(buttonColorAction); buttonColor[i].addMouseListener(buttonCursor); paneColor.add(buttonColor[i]); } pane.add(paneColor); // 画笔颜色选择器 Panel paneStroke = new Panel(new GridLayout(1, 13)); // 控制画笔样式 buttonStrokeAction = new ButtonStrokeAction(); Button [] buttonStroke = new Button[11]; buttonStroke[0] = new Button("1"); buttonStroke[1] = new Button("3"); buttonStroke[2] = new Button("5"); buttonStroke[3] = new Button("7"); buttonStroke[4] = new Button("9"); buttonStroke[5] = new Button("11"); buttonStroke[6] = new Button("13"); buttonStroke[7] = new Button("15"); buttonStroke[8] = new Button("17"); buttonStroke[9] = new Button("■"); buttonStroke[10] = new Button("●"); drawWidth = new Label("3", Label.CENTER); drawCap = new Label("●", Label.CENTER); drawWidth.setBackground(Color.lightGray); drawCap.setBackground(Color.lightGray); paneStroke.add(drawWidth); for(int i = 0; i < buttonStroke.length; i++){ paneStroke.add(buttonStroke[i]); buttonStroke[i].addMouseListener(buttonCursor); buttonStroke[i].addActionListener(buttonStrokeAction); if(i <= 8){ buttonStroke[i].setName("width"); }else{ buttonStroke[i].setName("cap"); } if(i == 8){ paneStroke.add(drawCap); } } pane.add(paneStroke); // 将画笔颜色选择器添加到窗体中 this.add(pane, BorderLayout.NORTH); // 将画图板添加到窗体中 this.add(palette); // 添加窗口监听，点击关闭按钮时退出程序 this.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); // 设置窗体 ICON 图标 this.setIconImage(Toolkit.getDefaultToolkit().createImage("images/palette.png")); // 设置窗口的大小 this.setSize(new Dimension(400, 430)); // 设置窗口位置，处于屏幕正中央 this.setLocationRelativeTo(null); // 显示窗口 this.setVisible(true); } /** * 程序入口 * * @param args * 字符串数组参数 */ public static void main(String[] args) { new TestMain(); } /** * 选取颜色按钮的监听事件类 * @author 米强 * */ class ButtonColorAction implements ActionListener { public void actionPerformed(ActionEvent e) { Color color_temp = ((Button)e.getSource()).getBackground(); nonceColor.setBackground(color_temp); palette.setColor(color_temp); } } /** * 鼠标进入按钮变换光标样式监听事件类 * @author 米强 * */ class ButtonCursor extends MouseAdapter { public void mouseEntered(MouseEvent e) { ((Button)e.getSource()).setCursor(new Cursor(Cursor.HAND_CURSOR)); } public void mouseExited(MouseEvent e) { ((Button)e.getSource()).setCursor(new Cursor(Cursor.DEFAULT_CURSOR)); } } /** * 设置画笔的监听事件类 * @author 米强 * */ class ButtonStrokeAction implements ActionListener { public void actionPerformed(ActionEvent e) { Button button_temp = (Button) e.getSource(); String name = button_temp.getName(); if(name.equalsIgnoreCase("width")){ drawWidth.setText(button_temp.getLabel()); palette.setStroke(Float.parseFloat(button_temp.getLabel())); }else if(name.equalsIgnoreCase("cap")){ drawCap.setText(button_temp.getLabel()); if(button_temp.getLabel().equals("■")){ palette.setStroke(BasicStroke.CAP_SQUARE); }else if(button_temp.getLabel().equals("●")){ palette.setStroke(BasicStroke.CAP_ROUND); } } } } } /** * 画板类 * * @author 米强 * */ class Palette extends Panel implements MouseListener, MouseMotionListener { // 鼠标 X 坐标的位置 private int mouseX = 0; // 上一次 X 坐标位置 private int oldMouseX = 0; // 鼠标 Y 坐标的位置 private int mouseY = 0; // 上一次 Y 坐标位置 private int oldMouseY = 0; // 画图颜色 private Color color = null; // 画笔样式 private BasicStroke stroke = null; // 缓存图形 private BufferedImage image = null; /** * 构造一个画板类 * */ public Palette() { this.addMouseListener(this); this.addMouseMotionListener(this); // 默认黑色画笔 color = new Color(0, 0, 0); // 设置默认画笔样式 stroke = new BasicStroke(3.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND); // 建立 1280 * 1024 的 RGB 缓存图象 image = new BufferedImage(1280, 1024, BufferedImage.TYPE_INT_RGB); // 设置颜色 image.getGraphics().setColor(Color.white); // 画背景 image.getGraphics().fillRect(0, 0, 1280, 1024); } /** * 重写 paint 绘图方法 */ public void paint(Graphics g) { super.paint(g); // 转换为 Graphics2D Graphics2D g2d = (Graphics2D) g; // 获取缓存图形 Graphics2D Graphics2D bg = image.createGraphics(); // 图形抗锯齿 bg.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); // 设置绘图颜色 bg.setColor(color); // 设置画笔样式 bg.setStroke(stroke); // 画线，从上一个点到新的点 bg.drawLine(oldMouseX, oldMouseY, mouseX, mouseY); // 将缓存中的图形画到画板上 g2d.drawImage(image, 0, 0, this); } /** * 重写 update 方法 */ public void update(Graphics g) { this.paint(g); } /** * @return stroke */ public BasicStroke getStroke() { return stroke; } /** * @param stroke 要设置的 stroke */ public void setStroke(BasicStroke stroke) { this.stroke = stroke; } /** * 设置画笔粗细 * @param width */ public void setStroke(float width) { this.stroke = new BasicStroke(width, stroke.getEndCap(), stroke.getLineJoin()); } /** * 设置画笔端点的装饰 * @param cap 参考 java.awt.BasicStroke 类静态字段 */ public void setStroke(int cap) { this.stroke = new BasicStroke(stroke.getLineWidth(), cap, stroke.getLineJoin()); } /** * @return color */ public Color getColor() { return color; } /** * @param color 要设置的 color */ public void setColor(Color color) { this.color = color; } public void mouseClicked(MouseEvent mouseEvent) { } /** * 鼠标按下 */ public void mousePressed(MouseEvent mouseEvent) { this.oldMouseX = this.mouseX = mouseEvent.getX(); this.oldMouseY = this.mouseY = mouseEvent.getY(); repaint(); } public void mouseReleased(MouseEvent mouseEvent) { } /** * 鼠标进入棋盘 */ public void mouseEntered(MouseEvent mouseEvent) { this.setCursor(new Cursor(Cursor.CROSSHAIR_CURSOR)); } /** * 鼠标退出棋盘 */ public void mouseExited(MouseEvent mouseEvent) { this.setCursor(new Cursor(Cursor.DEFAULT_CURSOR)); } /** * 鼠标拖动 */ public void mouseDragged(MouseEvent mouseEvent) { this.oldMouseX = this.mouseX; this.oldMouseY = this.mouseY; this.mouseX = mouseEvent.getX(); this.mouseY = mouseEvent.getY(); repaint(); } public void mouseMoved(MouseEvent mouseEvent) { } }

java开发画图板用什么软件

你的问题问的有点纠结： 如果你问的是工具，建议：Eclipse 如果你问的是语言，那就是你说的Java Swing

JAVA编译简易画图板代码

import java.applet.*; import java.awt.*; import java.awt.event.*; import java.util.*; import javax.swing.*; import java.awt.geom.*; import java.io.*; class Point implements Serializable { int x,y; Color col; int tool; int boarder; Point(int x, int y, Color col, int tool, int boarder) { this.x = x; this.y = y; this.col = col; this.tool = tool; this.boarder = boarder; } } class paintboard extends Frame implements ActionListener,MouseMotionListener,MouseListener,ItemListener { int x = -1, y = -1; int con = 1;//画笔大小 int Econ = 5;//橡皮大小 int toolFlag = 0;//toolFlag:工具标记 //toolFlag工具对应表： //（0--画笔）；（1--橡皮）；（2--清除）； //（3--直线）；（4--圆）；（5--矩形）； Color c = new Color(0,0,0); //画笔颜色 BasicStroke size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);//画笔粗细 Point cutflag = new Point(-1, -1, c, 6, con);//截断标志 Vector paintInfo = null;//点信息向量组 int n = 1; FileInputStream picIn = null; FileOutputStream picOut = null; ObjectInputStream VIn = null; ObjectOutputStream VOut = null; // *工具面板--画笔，直线，圆，矩形，多边形,橡皮，清除*/ Panel toolPanel; Button eraser, drLine,drCircle,drRect; Button clear ,pen; Choice ColChoice,SizeChoice,EraserChoice; Button colchooser; Label 颜色,大小B,大小E; //保存功能 Button openPic,savePic; FileDialog openPicture,savePicture; paintboard(String s) { super(s); addMouseMotionListener(this); addMouseListener(this); paintInfo = new Vector(); /*各工具按钮及选择项*/ //颜色选择 ColChoice = new Choice(); ColChoice.add("black"); ColChoice.add("red"); ColChoice.add("blue"); ColChoice.add("green"); ColChoice.addItemListener(this); //画笔大小选择 SizeChoice = new Choice(); SizeChoice.add("1"); SizeChoice.add("3"); SizeChoice.add("5"); SizeChoice.add("7"); SizeChoice.add("9"); SizeChoice.addItemListener(this); //橡皮大小选择 EraserChoice = new Choice(); EraserChoice.add("5"); EraserChoice.add("9"); EraserChoice.add("13"); EraserChoice.add("17"); EraserChoice.addItemListener(this); //////////////////////////////////////////////////// toolPanel = new Panel(); clear = new Button("清除"); eraser = new Button("橡皮"); pen = new Button("画笔"); drLine = new Button("画直线"); drCircle = new Button("画圆形"); drRect = new Button("画矩形"); openPic = new Button("打开图画"); savePic = new Button("保存图画"); colchooser = new Button("显示调色板"); //各组件事件监听 clear.addActionListener(this); eraser.addActionListener(this); pen.addActionListener(this); drLine.addActionListener(this); drCircle.addActionListener(this); drRect.addActionListener(this); openPic.addActionListener(this); savePic.addActionListener(this); colchooser.addActionListener(this); 颜色 = new Label("画笔颜色",Label.CENTER); 大小B = new Label("画笔大小",Label.CENTER); 大小E = new Label("橡皮大小",Label.CENTER); //面板添加组件 toolPanel.add(openPic); toolPanel.add(savePic); toolPanel.add(pen); toolPanel.add(drLine); toolPanel.add(drCircle); toolPanel.add(drRect); toolPanel.add(颜色); toolPanel.add(ColChoice); toolPanel.add(大小B); toolPanel.add(SizeChoice); toolPanel.add(colchooser); toolPanel.add(eraser); toolPanel.add(大小E); toolPanel.add(EraserChoice); toolPanel.add(clear); //工具面板到APPLET面板 add(toolPanel,BorderLayout.NORTH); setBounds(60,60,900,600); setVisible(true); validate(); //dialog for save and load openPicture = new FileDialog(this,"打开图画",FileDialog.LOAD); openPicture.setVisible(false); savePicture = new FileDialog(this,"保存图画",FileDialog.SAVE); savePicture.setVisible(false); openPicture.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { openPicture.setVisible(false); } }); savePicture.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { savePicture.setVisible(false); } }); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0);} }); } public void paint(Graphics g) { Graphics2D g2d = (Graphics2D)g; Point p1,p2; n = paintInfo.size(); if(toolFlag==2) g.clearRect(0,0,getSize().width,getSize().height);//清除 for(int i=0; iJAVA里什么类能实现画图的功能？大多数是JComponent 和 JPanel 当画板，覆写其中的paint 或者 paintComponent方法，图像的上下文就是Graphics 或者 Graphics2D 类

求一个简单的java画板程序 800行这样的

看看下面的代码，新建类T，把代码拷进去便可运行。

有运行截图： import java.awt.*; import java.awt.event.*; import java.util.*; import javax.swing.*; import java.awt.geom.*; import java.io.*; @SuppressWarnings({"serial","unused"}) class Point implements Serializable { int x,y; Color col; int tool; int boarder; Point(int x, int y, Color col, int tool, int boarder) { this.x = x; this.y = y; this.col = col; this.tool = tool; this.boarder = boarder; } } @SuppressWarnings({"serial","unused"}) class paintboard extends Frame implements ActionListener,MouseMotionListener,MouseListener,ItemListener { int x = -1, y = -1; int con = 1;//画笔大小 int Econ = 5;//橡皮大小 int toolFlag = 0;//toolFlag:工具标记 //toolFlag工具对应表： //（0--画笔）；（1--橡皮）；（2--清除）； //（3--直线）；（4--圆）；（5--矩形）； Color c = new Color(0,0,0); //画笔颜色 BasicStroke size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);//画笔粗细 Point cutflag = new Point(-1, -1, c, 6, con);//截断标志 @SuppressWarnings("unchecked") Vector paintInfo = null;//点信息向量组 int n = 1; FileInputStream picIn = null; FileOutputStream picOut = null; ObjectInputStream VIn = null; ObjectOutputStream VOut = null; // *工具面板--画笔，直线，圆，矩形，多边形,橡皮，清除*/ Panel toolPanel; Button eraser, drLine,drCircle,drRect; Button clear ,pen; Choice ColChoice,SizeChoice,EraserChoice; Button colchooser; Label 颜色,大小B,大小E; //保存功能 //Button openPic,savePic; FileDialog openPicture,savePicture; @SuppressWarnings("unchecked") paintboard(String s) { super(s); addMouseMotionListener(this); addMouseListener(this); paintInfo = new Vector(); /*各工具按钮及选择项*/ //颜色选择 ColChoice = new Choice(); ColChoice.add("black"); ColChoice.add("red"); ColChoice.add("blue"); ColChoice.add("green"); ColChoice.addItemListener(this); //画笔大小选择 SizeChoice = new Choice(); SizeChoice.add("1"); SizeChoice.add("3"); SizeChoice.add("5"); SizeChoice.add("7"); SizeChoice.add("9"); SizeChoice.addItemListener(this); //橡皮大小选择 EraserChoice = new Choice(); EraserChoice.add("5"); EraserChoice.add("9"); EraserChoice.add("13"); EraserChoice.add("17"); EraserChoice.addItemListener(this); //////////////////////////////////////////////////// toolPanel = new Panel(); clear = new Button("清除"); eraser = new Button("橡皮"); pen = new Button("画笔"); drLine = new Button("画直线"); drCircle = new Button("画圆形"); drRect = new Button("画矩形"); colchooser = new Button("显示调色板"); clear.setBackground(Color.GREEN); drRect.setBackground(Color.GREEN); pen.setBackground(Color.GREEN); eraser.setBackground(Color.GREEN); drLine.setBackground(Color.GREEN); drCircle.setBackground(Color.GREEN); colchooser.setBackground(Color.GREEN); //各组件事件监听 clear.addActionListener(this); eraser.addActionListener(this); pen.addActionListener(this); drLine.addActionListener(this); drCircle.addActionListener(this); drRect.addActionListener(this); colchooser.addActionListener(this); 颜色 = new Label("画笔颜色",Label.CENTER); 大小B = new Label("画笔大小",Label.CENTER); 大小E = new Label("橡皮大小",Label.CENTER); 颜色.setBackground(Color.gray); 大小B.setBackground(Color.gray); 大小E.setBackground(Color.gray); //面板添加组件 toolPanel.add(pen); toolPanel.add(drLine); toolPanel.add(drCircle); toolPanel.add(drRect); toolPanel.add(颜色); toolPanel.add(ColChoice); toolPanel.add(大小B); toolPanel.add(SizeChoice); toolPanel.add(colchooser); toolPanel.add(eraser); toolPanel.add(大小E); toolPanel.add(EraserChoice); toolPanel.add(clear); //工具面板到APPLET面板 add(toolPanel,BorderLayout.NORTH); setBounds(60,60,900,600); setVisible(true); validate(); //dialog for save and load openPicture = new FileDialog(this,"打开图画",FileDialog.LOAD); openPicture.setVisible(false); savePicture = new FileDialog(this,"保存图画",FileDialog.SAVE); savePicture.setVisible(false); openPicture.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { openPicture.setVisible(false); } }); savePicture.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { savePicture.setVisible(false); } }); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0);} }); } public void paint(Graphics g) { Graphics2D g2d = (Graphics2D)g; Point p1,p2; n = paintInfo.size(); if(toolFlag==2) g.clearRect(0,0,getSize().width,getSize().height);//清除 for(int i=1; i<n ;i++){ p1 = (Point)paintInfo.elementAt(i-1); p2 = (Point)paintInfo.elementAt(i); size = new BasicStroke(p1.boarder,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); g2d.setColor(p1.col); g2d.setStroke(size); if(p1.tool==p2.tool) { switch(p1.tool) { case 0://画笔 Line2D line1 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y); g2d.draw(line1); break; case 1://橡皮 g.clearRect(p1.x, p1.y, p1.boarder, p1.boarder); break; case 3://画直线 Line2D line2 = new Line2D.Double(p1.x, p1.y, p2.x, p2.y); g2d.draw(line2); break; case 4://画圆 Ellipse2D ellipse = new Ellipse2D.Double(p1.x, p1.y, Math.abs(p2.x-p1.x) , Math.abs(p2.y-p1.y)); g2d.draw(ellipse); break; case 5://画矩形 Rectangle2D rect = new Rectangle2D.Double(p1.x, p1.y, Math.abs(p2.x-p1.x) , Math.abs(p2.y-p1.y)); g2d.draw(rect); break; case 6://截断，跳过 i=i+1; break; default : }//end switch }//end if }//end for } public void itemStateChanged(ItemEvent e) { if(e.getSource()==ColChoice)//预选颜色 { String name = ColChoice.getSelectedItem(); if(name=="black") {c = new Color(0,0,0); } else if(name=="red") {c = new Color(255,0,0);} else if(name=="green") {c = new Color(0,255,0);} else if(name=="blue") {c = new Color(0,0,255);} } else if(e.getSource()==SizeChoice)//画笔大小 { String selected = SizeChoice.getSelectedItem(); if(selected=="1") { con = 1; size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); } else if(selected=="3") { con = 3; size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); } else if(selected=="5") {con = 5; size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); } else if(selected=="7") {con = 7; size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); } else if(selected=="9") {con = 9; size = new BasicStroke(con,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); } } else if(e.getSource()==EraserChoice)//橡皮大小 { String Esize = EraserChoice.getSelectedItem(); if(Esize=="5") { Econ = 5*2; } else if(Esize=="9") { Econ = 9*2; } else if(Esize=="13") { Econ = 13*2; } else if(Esize=="17") { Econ = 17*3; } } } @SuppressWarnings({"serial","unused", "unchecked"}) public void mouseDragged(MouseEvent e) { Point p1 ; switch(toolFlag){ case 0://画笔 x = (int)e.getX(); y = (int)e.getY(); p1 = new Point(x, y, c, toolFlag, con); paintInfo.addElement(p1); repaint(); break; case 1://橡皮 x = (int)e.getX(); y = (int)e.getY(); p1 = new Point(x, y, null, toolFlag, Econ); paintInfo.addElement(p1); repaint(); break; default : } } public void mouseMoved(MouseEvent e) {} public void update(Graphics g) { paint(g); } @SuppressWarnings("unchecked") public void mousePressed(MouseEvent e) { Point p2; switch(toolFlag){ case 3://直线 x = (int)e.getX(); y = (int)e.getY(); p2 = new Point(x, y, c, toolFlag, con); paintInfo.addElement(p2); break; case 4: //圆 x = (int)e.getX(); y = (int)e.getY(); p2 = new Point(x, y, c, toolFlag, con); paintInfo.addElement(p2); break; case 5: //矩形 x = (int)e.getX(); y = (int)e.getY(); p2 = new Point(x, y, c, toolFlag, con); paintInfo.addElement(p2); break; default : } } @SuppressWarnings("unchecked") public void mouseReleased(MouseEvent e) { Point p3; switch(toolFlag){ case 0://画笔 paintInfo.addElement(cutflag); break; case 1: //eraser paintInfo.addElement(cutflag); break; case 3://直线 x = (int)e.getX(); y = (int)e.getY(); p3 = new Point(x, y, c, toolFlag, con); paintInfo.addElement(p3); paintInfo.addElement(cutflag); repaint(); break; case 4: //圆 x = (int)e.getX(); y = (int)e.getY(); p3 = new Point(x, y, c, toolFlag, con); paintInfo.addElement(p3); paintInfo.addElement(cutflag); repaint(); break; case 5: //矩形 x = (int)e.getX(); y = (int)e.getY(); p3 = new Point(x, y, c, toolFlag, con); paintInfo.addElement(p3); paintInfo.addElement(cutflag); repaint(); break; default: } } public void mouseEntered(MouseEvent e){} public void mouseExited(MouseEvent e){} public void mouseClicked(MouseEvent e){} @SuppressWarnings("unchecked") public void actionPerformed(ActionEvent e) { if(e.getSource()==pen)//画笔 {toolFlag = 0;} if(e.getSource()==eraser)//橡皮 {toolFlag = 1;} if(e.getSource()==clear)//清除 { toolFlag = 2; paintInfo.removeAllElements(); repaint(); } if(e.getSource()==drLine)//画线 {toolFlag = 3;} if(e.getSource()==drCircle)//画圆 {toolFlag = 4;} if(e.getSource()==drRect)//画矩形 {toolFlag = 5;} if(e.getSource()==colchooser)//调色板 { Color newColor = JColorChooser.showDialog(this,"调色板",c); c = newColor; } } } //end paintboard public class T{ public static void main(String args[]){ new paintboard("画图程序"); } }