package cuko;

 

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Component;

import java.awt.GridLayout;

 

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

 

public 

class 

计算机界面 {

JFrame f;

JButton b[];

JPanel p;

GridLayout g;

JTextField t;

String a[]= {

"7"

,

"8"

,

"9"

,

"/"

,

"4"

,

"5"

,

"6"

,

"*"

,

"1"

,

"2"

,

"3"

,

"-"

,

"0"

,

"."

,

"="

,

"+"

};

   

public 

计算机界面() {

      

f=

new 

JFrame(

"计算器"

);

       

      

t=

new 

JTextField();

       

      

p=

new 

JPanel();

      

p.setBackground(Color.GRAY);

       

       

g=

new   

GridLayout(4,4);

       

p.setLayout(g);

       

b=

new 

JButton[a.length];

      

for

(

int 

i=0;i<16;i++)

           

      

{b[i]=

new 

JButton(a[i]);

         

// p.add(a[i]);

      

p.add(b[i]);

//把吧b[]加入面板p中

      

}      

      

f.add(t,BorderLayout.NORTH);

//设置一个分格的，作用把文本框放在最上面

      

f.add(p,BorderLayout.CENTER);

//把网格布局放在下面，实现计算器的分布

        

       

f.setSize(300,280);

       

f.setVisible(

true

);

        

       

p.setLayout(g);

        

       

f.add(p);

 

   

}

public 

static 

void 

main(String[] args) {

     

new 

计算机界面();

}

 

}

　　

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package cuko;       import java.awt.Color; import java.awt. event .ActionEvent; import java.awt. event .ActionListener;   import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel;   public  class  换颜色的窗体 {      JFrame jf;      JPanel[] jp;      JButton[] jb;      public  换颜色的窗体()      {          jf =  new  JFrame();          jp =  new  JPanel[2];          for ( int  i =0; i<jp.length; i++)          {              jp[i] =  new  JPanel();          }          jb =  new  JButton[4];          jb[0] =  new  JButton( "红色" );          jb[1] =  new  JButton( "绿色" );          jb[2] =  new  JButton( "蓝色" );          jb[3] =  new  JButton( "自定义色" );          for ( int  i =0; i<jb.length; i++)          {              jp[0].add(jb[i]);          }          jf.add( "North" , jp[0]);          jf.add( "Center" , jp[1]);          jb[0].addActionListener( new  ActionListener(){             // @Override              public  void  actionPerformed(ActionEvent e){                  jp[1].setBackground(Color.RED);              }});          jb[1].addActionListener( new  ActionListener(){             // @Override              public  void  actionPerformed(ActionEvent e){                  jp[1].setBackground(Color.GREEN);              }});          jb[2].addActionListener( new  ActionListener(){              //@Override              public  void  actionPerformed(ActionEvent e){                  jp[1].setBackground(Color.BLUE);              }});jb[3].addActionListener( new  ActionListener(){                  //@Override                  public  void  actionPerformed(ActionEvent e){                      jp[1].setBackground(  new  Color(0,255,255)); //自定义颜色范围在0到255                  }});        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);          jf.setSize(300, 200);          jf.setVisible( true );      }      public  static  void  main(String[] args) {          new  换颜色的窗体();      }       }