帮忙设计一下JAVA程序，谢谢~

package bdzhidao

import java.awt.*

import javax.swing.*

import java.awt.event.*

public class DrawingBoard extends JFrame{

int[] xPoint={200,300,500}

int[] yPoint={100,180,240}

static int m=15

static Color color=new Color(255,0,0)

private JComboBox jcb2=new JComboBox(new Object[]{

" 20"," 28"," 36"," 44"," 52"," 72 "

})

private JComboBox jcb3=new JComboBox(new Object[]{

"红色","黑色","蓝色","绿色"

})

public DrawingBoard(){

JMenuBar Bar=new JMenuBar()

JMenu jmFile=new JMenu("文件")

JMenuItem jmi1=new JMenuItem("新建")

JMenuItem jmi2=new JMenuItem("打开")

JMenuItem jmi3=new JMenuItem("保存")

JMenuItem jmi4=new JMenuItem("退出")

jmFile.add(jmi1)

jmFile.add(jmi2)

jmFile.add(jmi3)

jmFile.add(jmi4)

JLabel jlb1=new JLabel("线条")

JLabel jlb2=new JLabel("线宽")

JLabel jlb3=new JLabel("颜色")

final JComboBox jcb1=new JComboBox(new Object[]{

"实线","虚线"

})

JButton jbt0=new JButton("直线")

JButton jbt1=new JButton("三角形")

JButton jbt2=new JButton("圆")

JButton jbt3=new JButton("矩形")

JPanel jp1=new JPanel()

jp1.add(jlb1)

jp1.add(jcb1)

jp1.add(jlb2)

jp1.add(jcb2)

jp1.add(jlb3)

jp1.add(jcb3)

jp1.add(jbt0)

jp1.add(jbt1)

jp1.add(jbt2)

jp1.add(jbt3)

final DrawingPanel jp2=new DrawingPanel()

jp2.setBackground(Color.white)

jp2.setPreferredSize(new Dimension(736,300))

this.add(Bar)

this.add(jp1,BorderLayout.CENTER)

this.add(jp2,BorderLayout.SOUTH)

jcb1.addItemListener(new ItemListener(){

public void itemStateChanged(ItemEvent e){

if(jcb1.getSelectedItem()=="实线"){

Graphics g=jp2.getGraphics()

g.drawLine(10,10,736,10)

}

if(jcb1.getSelectedItem()=="虚线"){

Graphics g=jp2.getGraphics()

for(int i=1i<100i++){

g.drawLine(6*i-6,50,6*i-3,50)

}

}

}

})

jcb2.addItemListener(new ItemListener(){

public void itemStateChanged(ItemEvent e){

if(jcb2.getSelectedItem()==" 20"){

m=20

repaint()

}

if(jcb2.getSelectedItem()==" 28"){

m=28repaint()

}

if(jcb2.getSelectedItem()==" 36"){

m=36repaint()

}

if(jcb2.getSelectedItem()==" 44"){

m=44repaint()

}

if(jcb2.getSelectedItem()==" 52"){

m=52repaint()

}

if(jcb2.getSelectedItem()==" 72 "){

m=72repaint()

}

}

})

jcb3.addItemListener(new ItemListener(){

public void itemStateChanged(ItemEvent e){

if(jcb3.getSelectedItem()=="红色"){

color=new Color(255,0,0)

repaint()

}

if(jcb3.getSelectedItem()=="蓝色"){

color=new Color(0,0,255)

repaint()

}

if(jcb3.getSelectedItem()=="黑色"){

color=new Color(0,0,0)

repaint()

}

if(jcb3.getSelectedItem()=="绿色"){

color=new Color(0,128,0)

repaint()

}

}

})

jbt0.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

Graphics g=jp2.getGraphics()

g.drawLine(10,10,736,10)

}

})

jbt1.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

Graphics grap=jp2.getGraphics()//创建所画组件对象

grap.drawPolygon(xPoint,yPoint,3)

}

})

jbt2.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

Graphics gr=jp2.getGraphics()

gr.drawOval(100,10,200,200)

}

})

jbt3.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

Graphics G= jp2.getGraphics()

G.drawRect(500,50,200,200)

}

})

}

public static void main(String[] args){

JFrame frame=new DrawingBoard()

frame.setTitle("测试画图板")

frame.setSize(736,379)

frame.setLocation(100,100)

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

frame.setVisible(true)

}

static class DrawingPanel extends JPanel{

protected void paintComponent(Graphics g){

super.paintComponent(g)

g.setFont(new Font("宋体",Font.BOLD,m))

g.setColor(color)

g.drawString("Heleoeo ",100, 100)

}

}

}

按照你的要求编写的JavaGUI程序如下：

import java.awt.GridLayout

import java.awt.event.ActionEvent

import java.awt.event.ActionListener

import javax.swing.JButton

import javax.swing.JFrame

import javax.swing.JPanel

import javax.swing.JTextField

public class HH extends JFrame implements ActionListener{

 JPanel jp1=new JPanel()

 JPanel jp2=new JPanel()

 JPanel jp3=new JPanel()

 JTextField jtf=new JTextField(20)

 JButton jb1=new JButton("显示")

 JButton jb2=new JButton("清除")

 HH(){

  jb1.addActionListener(this)

  jb2.addActionListener(this)

  jp1.setLayout(new GridLayout(2,1))

  jp3.add(jtf)

  jp2.add(jb1)jp2.add(jb2)

  jp1.add(jp3)jp1.add(jp2)

  getContentPane().add(jp1)

  setSize(300, 120)

  setLocationRelativeTo(null)

  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

  setVisible(true)

 }

 @Override

 public void actionPerformed(ActionEvent e) {

  if(e.getSource()==jb1){

   jtf.setText("java程序设计")

  }

  if(e.getSource()==jb2){

   jtf.setText("")

  }

 }

 public static void main(String[] args) {

  new HH()

 }

}

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