用java 基于SWING的图形用户界面设计 编写一个应用程序

package heh;//我自己的包名
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.*;
public class Jsq extends JFrame
{
Panel pan1=new Panel();
Panel pan2=new Panel();
Panel pan3=new Panel();
Panel pan4=new Panel();
Panel pan5=new Panel();
Label la1=new Label("欢迎使用计算器");

Button bt1=new Button(" ");
Button bt2=new Button("MC");
Button bt3=new Button("MR");
Button bt4=new Button("MS");
Button bt5=new Button("M+");

Button bt11=new Button("Backspace");
Button bt12=new Button("CE");
Button bt13=new Button("C");

Button but[]=new Button[20];
String buta[]={"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","-/+",".","+","="};

JTextField t1=new JTextField("0");//swing组件，可以设置对齐方式

double a=0;//记录计算中的值或结果
String b="";//“+,-,*,/”运算符号标记
int d=0; //是否刚刚按过运算符号标记
int x=0; //是否刚刚按过“=”号标记
int y=0; //屏幕刚刚出现过汉字的标记

public Jsq()
{
super("计算器");
add(pan1,BorderLayout.NORTH);
add(pan4,BorderLayout.CENTER);
add(pan3,BorderLayout.WEST);

pan3.setLayout(new GridLayout(0,1,10,10));
pan3.add(bt1);pan3.add(bt2);pan3.add(bt3);pan3.add(bt4);pan3.add(bt5);

pan4.setLayout(new BorderLayout());
pan4.add(pan5,BorderLayout.NORTH);
pan4.add(pan2,BorderLayout.CENTER);

pan5.setLayout(new GridLayout(1,3,5,5));
pan5.add(bt11);pan5.add(bt12);pan5.add(bt13);

pan1.setLayout(new GridLayout(3,1));
pan1.add(la1);
pan1.add(t1);

t1.setEditable(false);//文本框设置为不可修改
t1.setHorizontalAlignment(JTextField.RIGHT);//设置文本框对齐方式

pan2.setLayout(new GridLayout(4,5,10,10));
for(int i=0;i<20;i++)
{
but[i]=new Button(buta[i]);
pan2.add(but[i]);
}
but[0].addActionListener(new A());
but[1].addActionListener(new A());
but[2].addActionListener(new A());
but[3].addActionListener(new A());
but[4].addActionListener(new A());
but[5].addActionListener(new A());
but[6].addActionListener(new A());
but[7].addActionListener(new A());
but[8].addActionListener(new A());
but[9].addActionListener(new A());
but[10].addActionListener(new A());
but[11].addActionListener(new A());
but[12].addActionListener(new A());
but[13].addActionListener(new A());
but[14].addActionListener(new A());
but[15].addActionListener(new A());
but[16].addActionListener(new A());
but[17].addActionListener(new A());
but[18].addActionListener(new A());
but[19].addActionListener(new A());
bt11.addActionListener(new A());
bt12.addActionListener(new A());
bt13.addActionListener(new A());

bt1.addActionListener(new A());
bt2.addActionListener(new A());
bt3.addActionListener(new A());
bt4.addActionListener(new A());
bt5.addActionListener(new A());

}

class A implements ActionListener
{
public void actionPerformed(ActionEvent e)
{

if(e.getSource()==but[0]) //"7"
{
if(x==1) //判断是否刚刚按过"="
{
t1.setText("7");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{ //如果显示为"0"或"0.0"或者刚刚按过运算符号
t1.setText("7"); //或者屏幕显示为汉字 那么显示为"7"
y=0;//将标记设置为0
}
else
t1.setText(t1.getText()+"7");//将显示的字符串后面加"7"
d=0;//将标记设置为0

if(t1.getText().length()>40)//判断显示字符长度是否超过40
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}

if(e.getSource()==but[1]) //"8"
{
if(x==1)
{
t1.setText("8");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("8");
y=0;
}
else
t1.setText(t1.getText()+"8");
d=0;
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}

if(e.getSource()==but[2]) //"9"
{
if(x==1)
{
t1.setText("9");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("9");
y=0;
}
else
t1.setText(t1.getText()+"9");
d=0;
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}

if(e.getSource()==but[3]) //"/"
{
if(y==1) //判断显示的是否为汉字
{
t1.setText("0");
y=0;
}
if(d==0) //判断是否刚刚按过运算符号 防止连续按运算符号产生错误
{
if(b.equals("+"))//四则混合运算时 判断上次计算是否为"+"
{
a=a+Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("-"))//四则混合运算时 判断上次计算是否为"-"
{
a=a-Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("*"))//四则混合运算时 判断上次计算是否为"*"
{
a=a*Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("/"))//四则混合运算时 判断上次计算是否为"/"
{
double f=Double.valueOf(t1.getText()).doubleValue();
if(f==0)//判断除数是否为0
{
t1.setText("错误！请按“CE”清屏后继续计算");
y=1;
}
else
{
a=a/Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}

}

if(b.equals(""))//判断进行的是不是四则混合运算的第一次运算
{
a=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}

if(!t1.getText().equals("错误！请按“CE”清屏后继续计算"))//是否出现了除数为零的错误
{
b="/";//运算符号标记设置为"/"

d=1; //标记已经按过运算符号

}
if(t1.getText().length()>40)//判断显示字符长度是否超过40
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;//将记忆的数字抹去
b="";//运算符号标记 为未按过运算符号

d=0;//标记 刚刚没有按过运算符号
y=1;//标记 屏幕显示了汉字
}

}
if(e.getSource()==but[4]) //"sqrt"
{
if(y==1)
{
t1.setText("0");
y=0;
}
double f=Double.valueOf(t1.getText()).doubleValue();
if(f<0) //判断被开放数是否小于零
{
t1.setText("错误！被开方数小于0,请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
else
{
f=Math.sqrt(f);
t1.setText(""+(f));
}

if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[5]) //"4"
{
if(x==1)
{
t1.setText("4");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("4");
y=0;
}
else
t1.setText(t1.getText()+"4");
d=0;
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[6]) //"5"
{
if(x==1)
{
t1.setText("5");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("5");
y=0;
}
else
t1.setText(t1.getText()+"5");
d=0;
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[7]) //"6"
{
if(x==1)
{
t1.setText("6");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("6");
y=0;
}
else
t1.setText(t1.getText()+"6");
d=0;
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[8]) //"*"
{
if(y==1)
{
t1.setText("0");
y=0;
}
if(d==0)
{
if(b.equals("+"))
{
a=a+Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("-"))
{
a=a-Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("*"))
{
a=a*Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("/"))
{
double f=Double.valueOf(t1.getText()).doubleValue();
if(f==0)
{
t1.setText("错误！请按“CE”清屏后继续计算");
y=1;
}
else
{
a=a/Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}

}

if(b.equals(""))
{
a=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}
if(!t1.getText().equals("错误！请按“CE”清屏后继续计算"))
{
b="*";

d=1;

}
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[9]) //"%"
{
if(y==1)
{
t1.setText("0");
y=0;
}
double f=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+(f/100));
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[10]) //"1"
{

if(x==1)
{
t1.setText("1");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("1");
y=0;
}
else
t1.setText(t1.getText()+"1");
d=0;
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[11]) //"2"
{
if(x==1)
{
t1.setText("2");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("2");
y=0;
}
else
t1.setText(t1.getText()+"2");
d=0;
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[12]) //"3"
{
if(x==1)
{
t1.setText("3");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("3");
y=0;
}
else
t1.setText(t1.getText()+"3");
d=0;
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[13]) //"-"
{
if(y==1)
{
t1.setText("0");
y=0;
}
if(d==0)
{
if(b.equals("+"))
{
a=a+Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("-"))
{
a=a-Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("*"))
{
a=a*Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("/"))
{
double f=Double.valueOf(t1.getText()).doubleValue();
if(f==0)
{
t1.setText("错误！请按“CE”清屏后继续计算");
y=1;
}
else
{
a=a/Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}

}

if(b.equals(""))
{
a=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}
if(!t1.getText().equals("错误！请按“CE”清屏后继续计算"))
{
b="-";

d=1;

}
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[14]) //"1/x"
{
if(y==1)
{
t1.setText("0");
y=0;
}
else
{
double f=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+(1/f));
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}

}
if(e.getSource()==but[15]) //"0"
{

if(x==1)
{
t1.setText("0");
x=0;
}
if(t1.getText().equals("0.0")||t1.getText().equals("0")||d==1||y==1)
{
t1.setText("0");
y=0;
}
else
t1.setText(t1.getText()+"0");
d=0;
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[16]) //"-/+"
{
if(y==1)
{
t1.setText("0");
y=0;
}
double f=Double.valueOf(t1.getText()).doubleValue();

t1.setText(""+(-f));

if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[17]) //"."
{
if(y==1)
{
t1.setText("0");
y=0;
}
if(t1.getText().indexOf(".")==-1)//判断是否已经有"."
{
t1.setText(t1.getText()+".");

}
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}

}
if(e.getSource()==but[18]) //"+"
{
if(y==1)
{
t1.setText("0");
y=0;
}
if(d==0)
{
if(b.equals("+"))
{
a=a+Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("-"))
{
a=a-Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("*"))
{
a=a*Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("/"))
{
double f=Double.valueOf(t1.getText()).doubleValue();
if(f==0)
{
t1.setText("错误！请按“CE”清屏后继续计算");
y=1;
}
else
{
a=a/Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}

}

if(b.equals(""))
{
a=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
}

if(!t1.getText().equals("错误！请按“CE”清屏后继续计算"))
{
b="+";

d=1;

}
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}
}
if(e.getSource()==but[19]) //"="
{
if(y==1)
{
t1.setText("0");
y=0;
}
if(b.equals("+"))
{
a=a+Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("-"))
{
a=a-Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("*"))
{
a=a*Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}
if(b.equals("/"))
{
double f=Double.valueOf(t1.getText()).doubleValue();
if(f==0)
{
t1.setText("错误！请按“CE”清屏后继续计算");
y=1;
}
else
{
a=a/Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}

}

if(b.equals(""))
{
a=Double.valueOf(t1.getText()).doubleValue();
t1.setText(""+a);
}

if(!t1.getText().equals("错误！请按“CE”清屏后继续计算"))
{
b="";

d=1;
x=1;

}
if(t1.getText().length()>40)
{
t1.setText("错误！数字过长，请按“C”从新输入");
a=0.0;
b="";

d=0;
y=1;
}

}
if(e.getSource()==bt11) //"Backspace"
{
if(y==1)
{
t1.setText("0");
y=0;
}
else
{

String s1=t1.getText();
if(s1.length()==1)//如果将显示的数字全部退掉 则显示"0"
{
t1.setText("0");
}
else
{
t1.setText(s1.substring(0,(s1.length()-1)));//退格

}

}

}
if(e.getSource()==bt12) //"CE"
{
t1.setText("0");//清屏

}
if(e.getSource()==bt13) //"C" 初始化
{
t1.setText("0");
a=0.0;
b="";

d=0;
}
if(e.getSource()==bt1) //""
{

}
if(e.getSource()==bt2) //"MC"
{

}
if(e.getSource()==bt3) //"MR"
{

}
if(e.getSource()==bt4) //"MS"
{

}
if(e.getSource()==bt5) //"M+"
{

}

}
}
public static void main(String args[])
{
Jsq a=new Jsq();
a.setSize(300,250);
a.setVisible(true);
}

}

package net.pzw;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Test extends JFrame{

private static final long serialVersionUID = 1L;

JFrame frame=new JFrame();
JPanel panel=new JPanel();
JTextField field1=new JTextField(5);
JTextField field2=new JTextField(5);
JTextField field3=new JTextField(5);
JButton button1=new JButton("+");
JButton button2=new JButton("-");
JButton button3=new JButton("*");
JButton button4=new JButton("/");

public Test() {
panel.add(field1);
panel.add(field2);
panel.add(field3);
panel.add(button1);
panel.add(button2);
panel.add(button3);
panel.add(button4);
frame.add(panel);
frame.setSize(450,80);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
button1.addActionListener(new java.awt.event.ActionListener(){
public void actionPerformed(java.awt.event.ActionEvent evt){
int x=Integer.parseInt(field1.getText())+Integer.parseInt(field2.getText());
field3.setText(Integer.toString(x));
}
});

button2.addActionListener(new java.awt.event.ActionListener(){
public void actionPerformed(java.awt.event.ActionEvent evt){
int x=Integer.parseInt(field1.getText())-Integer.parseInt(field2.getText());
field3.setText(Integer.toString(x));
}
});

button3.addActionListener(new java.awt.event.ActionListener(){
public void actionPerformed(java.awt.event.ActionEvent evt){
int x=Integer.parseInt(field1.getText())*Integer.parseInt(field2.getText());
field3.setText(Integer.toString(x));
}
});

button4.addActionListener(new java.awt.event.ActionListener(){
public void actionPerformed(java.awt.event.ActionEvent evt){
int x=Integer.parseInt(field1.getText())/Integer.parseInt(field2.getText());
field3.setText(Integer.toString(x));
}
});
}

public static void main(String[] args) {
new Test();
}
}

30分就想让别人帮你写程序？？？虽然很简单，但是没人有那闲心。