Java开发网 - Re:求教计算器问题（急~~~）

Java开发网

您没有登录

» Java开发网 » Java SE 综合讨论区

打印话题 寄给朋友 订阅主题

作者

Re:求教计算器问题（急~~~） [Re:rahoo]

j2ee8000

发贴: 15
积分: 0

于 2004-12-31 22:04

// writen by jason zhang
// 布局管理的学习
// 04.11.11
//------------------------------------------------------------------

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

class layout_exp extends JFrame implements ActionListener{
  JButton num1=new JButton("1");
  JButton num2=new JButton("2");
  JButton num3=new JButton("3");
  JButton num4=new JButton("4");
  JButton num5=new JButton("5");
  JButton num6=new JButton("6");
  JButton num7=new JButton("7");
  JButton num8=new JButton("8");
  JButton num9=new JButton("9");
  JButton num0=new JButton("0");
  JButton op1=new JButton("+");
  JButton op2=new JButton("-");
  JButton op3=new JButton("*");
  JButton op4=new JButton("/");
  JButton op5=new JButton("=");
  JTextField result=new JTextField(15);
  int lastnum;
  int nownum;
  int count;
  int operator_type;
  layout_exp()
  {

    super("计算器");
    setSize(300,300);
    lastnum=0;
    nownum=0;
    count=0;
    operator_type=0;
    JPanel pane=new JPanel();
    GridLayout computer=new GridLayout(5,3,10,10);//网格布局10行3列，间距10
    pane.setLayout(computer);//面板选取布局
    pane.add(num1);
    pane.add(num2);
    pane.add(num3);
    pane.add(num4);
    pane.add(num5);
    pane.add(num6);
    pane.add(num7);
    pane.add(num8);
    pane.add(num9);
    pane.add(num0);
    pane.add(op1);
    pane.add(op2);
    pane.add(op3);
    pane.add(op4);
    pane.add(op5);
    JPanel pane1=new JPanel();//另一个面板，显示结果
    pane1.add(result);//添加控件到面板
    JPanel panetotal=new JPanel();//总的面板，包含上面的2个，注意此时上面的2个必须已设计完成
    GridLayout com=new GridLayout(2,1,10,10);
    panetotal.setLayout(com);
    panetotal.add(pane1);
    panetotal.add(pane);
    //下面添加响应事件
    num1.addActionListener(this);
    num2.addActionListener(this);
    num3.addActionListener(this);
    num4.addActionListener(this);
    num5.addActionListener(this);
    num6.addActionListener(this);
    num7.addActionListener(this);
    num8.addActionListener(this);
    num9.addActionListener(this);
    num0.addActionListener(this);
    op1.addActionListener(this);
    op2.addActionListener(this);
    op3.addActionListener(this);
    op4.addActionListener(this);
    op5.addActionListener(this);
    setContentPane(panetotal);//将面板加入框架
  }

  public void actionPerformed(ActionEvent evt)
  {//具体处理按键响应
    Object source=evt.getSource();
    if(source==num1)
    {

      if(count>0)
      {
        String t=result.getText();
       if(Integer.parseInt Phone

==0)
        result.setText("");
     String temp=result.getText();
        result.setText(temp+1);
        count++;
        return;
      }

      else
      {
        result.setText("1");
        count++;
        return;
      }
    }
    if(source==num2)
    {

      if(count>0)
      {
        String t=result.getText();
       if(Integer.parseInt Phone

==0)
        result.setText("");
        String temp=result.getText();
        result.setText(temp+2);
        count++;
        return;
      }

      else
      {
        result.setText("2");
        count++;
        return;
      }
    }
    if(source==num3)
    {

      if(count>0)
      {
        String t=result.getText();
        if(Integer.parseInt Phone

==0)
        result.setText("");
        String temp=result.getText();
        result.setText(temp+3);
        count++;
        return;
      }

      else
      {
        result.setText("3");
        count++;
        return;
      }
    }
    if(source==num4)
    {

      if(count>0)
      {
        String t=result.getText();
        if(Integer.parseInt Phone

==0)
        result.setText("");
        String temp=result.getText();
        result.setText(temp+4);
        count++;
        return;
      }

      else
      {
        result.setText("4");
        count++;
        return;
      }
    }
    if(source==num5)
    {

      if(count>0)
      {
        String t=result.getText();
        if(Integer.parseInt Phone

==0)
        result.setText("");
        String temp=result.getText();
        result.setText(temp+5);
        count++;
        return;
      }

      else
      {
        result.setText("5");
        count++;
        return;
      }
    }
    if(source==num6)
    {

      if(count>0)
      {
        String t=result.getText();
        if(Integer.parseInt Phone

==0)
        result.setText("");
        String temp=result.getText();
        result.setText(temp+6);
        count++;
        return;
      }

      else
      {
        result.setText("6");
        count++;
        return;
      }
    }
    if(source==num7)
    {

      if(count>0)
      {
        String t=result.getText();
        if(Integer.parseInt Phone

==0)
        result.setText("");
        String temp=result.getText();
        result.setText(temp+7);
        count++;
        return;
      }

      else
      {
        result.setText("7");
        count++;
        return;
      }
    }
    if(source==num8)
    {

      if(count>0)
      {
        String t=result.getText();
        if(Integer.parseInt Phone

==0)
        result.setText("");
        String temp=result.getText();
        result.setText(temp+8);
        count++;
        return;
      }

      else
      {
        result.setText("8");
        count++;
        return;
      }
    }
    if(source==num9)
    {

      if(count>0)
      {
        String t=result.getText();
        if(Integer.parseInt Phone

==0)
        result.setText("");
        String temp=result.getText();
        result.setText(temp+9);
        count++;
        return;
      }

      else
      {
        result.setText("9");
        count++;
        return;
      }
    }
    if(source==num0)
    {
      if(count>0)
      {
        String temp=result.getText();
        if(Integer.parseInt(temp)!=0)
         result.setText(temp+0);
        count++;
        return;
      }

      else
      {
        result.setText("0");
        count++;
        return;
      }
    }
    if(source==op1)
    {
      count=0;
      operator_type=1;
      String temp=result.getText();
      lastnum=Integer.parseInt(temp);
      return;
    }
    if(source==op2)
    {
      operator_type=2;
      count=0;
      String temp=result.getText();
      lastnum=Integer.parseInt(temp);
      return;
    }
    if(source==op3)
    {
      count=0;
      operator_type=3;
      String temp=result.getText();
      lastnum=Integer.parseInt(temp);
      return;
    }
    if(source==op4)
    {
      count=0;
      operator_type=4;
      String temp=result.getText();
      lastnum=Integer.parseInt(temp);
      return;
    }
    if(source==op5)
    {
      count=0;
      String temp=result.getText();
      nownum=Integer.parseInt(temp);//通过函数将JText中的字符串转换为整型
      switch(operator_type)
      {
        case 1:
          result.setText(String.valueOf(lastnum+nownum));
       break;
       case 2:
          result.setText(String.valueOf(lastnum-nownum));
       break;
       case 3:
          result.setText(String.valueOf(lastnum*nownum));
       break;
       case 4:
          result.setText(String.valueOf((float)((float)lastnum/(float)nownum)));
       break;
      }
      lastnum=0;
      nownum=0;
      return;
    }
  }
  public static void main(String[] arg){
    JFrame frame=new layout_exp();
    //添加窗口退出响应
    ExitWindow exit=new ExitWindow();
    frame.addWindowListener(exit);
    frame.show();
  }
}


class ExitWindow extends WindowAdapter{
  public void windowClosing(WindowEvent e)
  {
    System.exit(0);
  }
}
仅供参考!!

wertqwetwt

• 有了Swing为什么还要SWT?

话题树型展开

人气	标题	作者	字数	发贴时间
11800	求教计算器问题（急~~~）	rahoo	314	2004-12-26 13:44
8791	Re:求教计算器问题（急~~~）	doway	44	2004-12-26 22:50
8834	Re:求教计算器问题（急~~~）	j2ee8000	6948	2004-12-31 22:04

已读帖子

新的帖子

被删除的帖子