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几年没有碰swing了，给你详细注释了。仔细看。希望对你有所帮助。
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import java.awt.*;//java抽象窗口工具包
import java.awt.event.*;//java抽象窗口工具包组件所激发的各类事件的接口和类
public class Test5{//类名
Frame f;//定义一个Frame窗体
TextArea center;//文本域
Label la1,la2,la3;//三个标签
Panel east,south,north;//三块面板
Button b1,b2,b3,b4;//四个按钮
Choice l1;//下拉单选框
TextField t1;//文本域
// textfield只有一行可写
// textarea是一个区域,可以有很多行
public static void main(String[] args){//主函数，程序入口
Test mb = new Test();
mb.go();//调用go方法，初始化界面
}
private void go(){
f = new Frame("留言版程序");//标题
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent evt){
f.setVisible(false);
System.exit(0);
//System.exit(0) 0--正常结束程序 1--异常关闭程序
}
});
f.setBounds(0,0,600,400);//布局大小
f.setLayout(new BorderLayout());//显示方式
f.setResizable(false);
//下面都将控件按钮初始化，你懂得
north = new Panel();
south = new Panel();
east = new Panel();
center = new TextArea("留言内容：");
center.setEditable(false);
b1 = new Button("清屏");
b2 = new Button("至顶");
b3 = new Button("至尾");
la1 = new Label("留言版");
la2 = new Label("你");
la3 = new Label(" 地说:");
t1 = new TextField(20);
b4 = new Button("提交");
l1 =new Choice();
l1.add("微笑 ");
l1.add("生气 ");
l1.add("伤心 ");
f.add(BorderLayout.NORTH,north);//布局
f.add(BorderLayout.SOUTH,south);//布局
f.add(BorderLayout.EAST,east);//布局
f.add(BorderLayout.CENTER,center);//布局
north.add(BorderLayout.CENTER,la1);
south.add(la2);//把东西加到面板上
south.add(l1);
south.add(la3);
south.add(t1);//把东西加到面板上
south.add(b4);
east.setLayout(new GridLayout(9,0,1,10));
east.add(b1);
east.add(b2);
east.add(b3);
f.setVisible(true);//可视化
b4.addActionListener(new ActionListener(){//点击提交按钮产生事件
public void actionPerformed(ActionEvent e){
String text1,text2;
text1 = l1.getSelectedItem();
text2 = t1.getText();
t1.setText(null);
if(t1.getText() != ""){//将下拉单选框的内容和你输入在文本框的内容显示在中间面板上
center.append("\n");
center.append(text1);
center.append(text2);
}
}
});
b1.addActionListener(new ActionListener(){//清屏按钮事件，只留下中间面板显示：“留言内容:”，其余清楚
public void actionPerformed(ActionEvent e){
center.setText("留言内容:");
}
});
b2.addActionListener(new ActionListener(){//至顶按钮事件，光标焦点至顶
public void actionPerformed(ActionEvent e){
center.requestFocusInWindow();
center.setCaretPosition(8);
}
});
b3.addActionListener(new ActionListener(){//至尾按钮事件，光标焦点至尾
public void actionPerformed(ActionEvent e){
center.requestFocusInWindow();
center.setCaretPosition(center.getText().length());
}
});
}
}
还是耐着性子给你做完了望采纳。。。
第七题
/**
* 动物抽象类
*/
public abstract class Animal {
//颜色
private String color;
//类别
private String type;
//吃饭
public abstract void eat();
//叫
public abstract void cry();
//get set方法省略。。。
}
/**
* 游泳的接口
*/
public interface Swimable {
//游泳
public void swim();
}
/**
* 兔子类
*/
public class Rabbit extends Animal {
@Override
public void eat() {
System.out.println("小兔几吃萝卜。。。");
}
@Override
public void cry() {
System.out.println("小兔几呵呵哒。。。");
}
}
/**
* 青蛙类
*/
public class Frog extends Animal implements Swimable {
public void swim() {
System.out.println("青蛙会蛙泳。。。");
}
@Override
public void eat() {
System.out.println("青蛙吃昆虫。。。");
}
@Override
public void cry() {
System.out.println("青蛙呱呱叫。。。");
}
}
public class Test {
public static void main(String[] args) {
//兔子
Rabbit rabbit = new Rabbit();
rabbit.eat();
rabbit.cry();
//青蛙
Frog frog = new Frog();
frog.eat();
frog.cry();
frog.swim();
}
}
第八题
/**
* 学生类
*/
public class Student {
//学号
private String id;
//姓名
private String name;
//性别
private char gender;
//年龄
private int age;
public Student(String id, String name, char gender, int age) {
this.id = id;
this.name = name;
this.gender = gender;
this.age = age;
}
//获得学号、姓名、性别、年龄
public String toString() {
return "学号："+id +" 姓名：" + name + " 性别：" + gender + " 年龄：" + age;
}
//修改年龄
public void changeAge(int range) {
age = range;
}
//get set方法省略。。。
}
public class Test {
public static void main(String[] args) {
Student s = new Student("alibb008", "杰克马", '公', 18) ;
System.out.println(s.toString());
s.changeAge(50);
System.out.println(s.toString());
}
}
感慨啊。。。
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; in ;i++){
p1 = (Point)paintInfo.elementAt(i);
p2 = (Point)paintInfo.elementAt(i+1);
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; }
}
}
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);
}
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 :
}
}
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){}
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;
}
if(e.getSource()==openPic)//打开图画
{
openPicture.setVisible(true);
if(openPicture.getFile()!=null)
{
int tempflag;
tempflag = toolFlag;
toolFlag = 2 ;
repaint();
try{
paintInfo.removeAllElements();
File filein = new File(openPicture.getDirectory(),openPicture.getFile());
picIn = new FileInputStream(filein);
VIn = new ObjectInputStream(picIn);
paintInfo = (Vector)VIn.readObject();
VIn.close();
repaint();
toolFlag = tempflag;
}
catch(ClassNotFoundException IOe2)
{
repaint();
toolFlag = tempflag;
System.out.println("can not read object");
}
catch(IOException IOe)
{
repaint();
toolFlag = tempflag;
System.out.println("can not read file");
}
}
}
if(e.getSource()==savePic)//保存图画
{
savePicture.setVisible(true);
try{
File fileout = new File(savePicture.getDirectory(),savePicture.getFile());
picOut = new FileOutputStream(fileout);
VOut = new ObjectOutputStream(picOut);
VOut.writeObject(paintInfo);
VOut.close();
}
catch(IOException IOe)
{
System.out.println("can not write object");
}
}
}
}//end paintboard
public class pb
{
public static void main(String args[])
{ new paintboard("画图程序"); }
}
上代码：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.LayoutManager;
import java.awt.Paint;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import java.awt.event.*;
public class YuanYiDong extends JFrame{
private static int BANJIN=0;
private static int X=0;
private static int Y=0;
JTextField rTxt=new JTextField(5);
JTextField xField=new JTextField(5);
JTextField yField=new JTextField(5);
JButton paintBt=new JButton("画");
JLabel huaban=new huaban();
JPanel jPanel=new JPanel();
JLabel banjingLabel,xLabel,yLabel;
public YuanYiDong(){
banjingLabel=new JLabel("半径");
xLabel=new JLabel("X坐标");
yLabel=new JLabel("Y坐标");
this.setTitle("圆的移动");
this.setLocation(300,100);
this.setSize(500, 400);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.add(rTxt);
jPanel.setLayout(new FlowLayout());
add(huaban,BorderLayout.CENTER);
jPanel.add(banjingLabel);
jPanel.add(rTxt);
jPanel.add(xLabel);
jPanel.add(xField);
jPanel.add(yLabel);
jPanel.add(yField);
jPanel.add(paintBt);
add(jPanel,BorderLayout.NORTH);
paintBt.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
BANJIN=Integer.parseInt(rTxt.getText());
X=Integer.parseInt(xField.getText());
Y=Integer.parseInt(yField.getText());
huaban.repaint();
}
});
}
private void drawCirlce(Graphics g) {
g.setColor(Color.blue);
g.fillOval(X, Y, BANJIN,BANJIN);
}
public static void main(String[] args) {
YuanYiDong frame = new YuanYiDong();
}
public class huaban extends JLabel{
public huaban(){}
public void paint(Graphics g) {
Image image = createImage(getWidth(), getHeight());
drawCirlce(image.getGraphics());
g.drawImage(image, 0, 0, null);
}
}
}
给分吧！
帮你改了一下。
你要画在panel上，然后frame.add(panel)就能显示。
是不是和applet搞混了，applet复写一些方法就能显示，但现在你编的是java gui
import java.awt.*;
import java.awt.Event.*;
import javax.swing.*; //import javax.swing.Timer;
import java.awt.BasicStroke;
//import java.util.Date;
//import java.text.*;
//import java.util.*;
public class TestGui {
public void paint(Graphics g) {
Graphics2D a2d = (Graphics2D) g;
int x = 120, y = 90, width = 150, height = 150;
a2d.setColor(Color.red);
a2d.setStroke(new BasicStroke(3.0f)); // 设置线条宽度，3.0即线的宽度
a2d.drawOval(x, y, width, height);
}
public static void main(String[] args) {
JFrame frame = new JFrame();
// frame.add(new paint(),BorderLayout.CENTER);
frame.setSize(500, 500);
frame.setLocation(200, 200);
frame.setVisible(true);
Panel p = new Panel();
frame.add(p);
// frame.paint(null);
// TODO code application logic here
}
}
class Panel extends JPanel {
// 重新覆盖paint方法
public void paint(Graphics g) {
super.paint(g);
Graphics2D a2d = (Graphics2D) g;
int x = 120, y = 90, width = 150, height = 150;
a2d.setColor(Color.red);
a2d.setStroke(new BasicStroke(3.0f)); // 设置线条宽度，3.0即线的宽度
a2d.drawOval(x, y, width, height);
}
}
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SimpleEvent extends JFrame {
private static final long serialVersionUID = 1L;
private static int a;
private static int b;
private static char c;
private static int d;
private JButton jb = new JButton("1");
private JButton jb1 = new JButton("2");
private JButton jb9 = new JButton("+");
private JButton jb10 = new JButton("=");
final JTextField jt = new JTextField("", 20);
private boolean firstDigit = true;
public SimpleEvent() {
setLayout(null);
setSize(350, 250);
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
Container cp = getContentPane();
cp.add(jb);
cp.add(jb1);
cp.add(jb9);
cp.add(jb10);
cp.add(jt);
jb.setBounds(10, 100, 80, 30);
jb1.setBounds(120, 100, 80, 30);
jb9.setBounds(10, 220, 80, 30);
jb10.setBounds(120, 220, 80, 30);
getContentPane().setLayout(new FlowLayout(80, 50, 10));
// if (firstDigit = true) {
// firstDigit = false;
jb.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if (firstDigit) {
jt.setText("1");
a = 1;
}
else {
jt.setText("1");
b = 1;
}
}
});
jb1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if (firstDigit) {
jt.setText("2");
a = 2;
}
else {
jt.setText("2");
b = 2;
}
}
});
// }
// if (firstDigit = false) {
// jb.addActionListener(new ActionListener() {
// public void actionPerformed(ActionEvent arg0) {
// }
// });
// jb1.addActionListener(new ActionListener() {
// public void actionPerformed(ActionEvent arg0) {
// }
// });
// }
jb9.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
firstDigit = false;
jt.setText("+");
// char c = '+';
c = '+';
}
});
jb10.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
firstDigit = true;
jt.setText("=");
switch (c) {
case '+' :
d = a + b;
break;
}
jt.setText(d + "");
System.out.println(a);
System.out.println(b);
System.out.println(d);
}
});
setVisible(true);
}
public static void main(String[] args) {
new SimpleEvent();
}
}