java數(shù)值計算器代碼 java實現(xiàn)簡單計算器

求"用JAVA編寫的計算器程序代碼"

import java.awt.*;

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import java.awt.event.*;

import javax.swing.*;

import javax.swing.event.*;

public class jsq

{

public static void main(String[] str)

{

jisuanqi jsq=new jisuanqi();

jsq.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

jsq.setVisible(true);jsq.setSize(300,300);

}

class jisuanqi extends JFrame implements ActionListener

{

double a=0,b=0,c=0,fuhao=5;

Boolean has=false;

Container A;

JTextField tf1;

JButton bt1,bt2,bt3,bt4,bt5,bt6,bt7,bt8,bt9,bt0,bt_dian;

JButton bt_jia,bt_jian,bt_cheng,bt_chu,bt_fuhao;

JButton bt_clear,bt_jisuan;

public jisuanqi()

{

setTitle("猛棚簡單計算器");

A=getContentPane();

GridBagLayout f=new GridBagLayout();

A.setLayout(f);

GridBagConstraints g=new GridBagConstraints();

g.fill=GridBagConstraints.BOTH;

g.gridwidth=1;

g.gridheight=1;

//面板的實例化

//顯示框的實例化

tf1=new JTextField(10);tf1.setEditable(false);

//數(shù)字鍵的實例化

bt1=new JButton("1");bt2=new JButton("2");bt3=new JButton("3");

bt4=new JButton("4");bt5=new JButton("5");bt6=new JButton("6");

bt7=new JButton("7");bt8=new JButton("8");bt9=new JButton("腔知知9");

bt0=new JButton("0");bt_dian=new JButton(".");bt_fuhao=new JButton("+/-");

//計算符號的實例化

bt_jia=new JButton("+");bt_jian=new JButton("-");

bt_cheng=new JButton("*");bt_chu=new JButton("/伍消");

//清空和計算按鈕的實例化

bt_clear=new JButton("clear");bt_jisuan=new JButton("=");

//布局

g.gridx=1;g.gridy=0;A.add(tf1,g);

g.gridx=0;g.gridy=1;A.add(bt_clear,g);

g.gridx=3;g.gridy=1;A.add(bt_jisuan,g);

g.gridx=0;g.gridy=2;A.add(bt7,g);

g.gridx=1;g.gridy=2;A.add(bt8,g);

g.gridx=2;g.gridy=2;A.add(bt9,g);

g.gridx=3;g.gridy=2;A.add(bt_jia,g);

g.gridx=0;g.gridy=3;A.add(bt4,g);

g.gridx=1;g.gridy=3;A.add(bt5,g);

g.gridx=2;g.gridy=3;A.add(bt6,g);

g.gridx=3;g.gridy=3;A.add(bt_jian,g);

g.gridx=0;g.gridy=4;A.add(bt1,g);

g.gridx=1;g.gridy=4;A.add(bt2,g);

g.gridx=2;g.gridy=4;A.add(bt3,g);

g.gridx=3;g.gridy=4;A.add(bt_cheng,g);

g.gridx=0;g.gridy=5;A.add(bt0,g);

g.gridx=1;g.gridy=5;A.add(bt_fuhao,g);

g.gridx=2;g.gridy=5;A.add(bt_dian,g);

g.gridx=3;g.gridy=5;A.add(bt_chu,g);

//添加監(jiān)聽

bt1.addActionListener(this);

bt2.addActionListener(this);

bt3.addActionListener(this);

bt4.addActionListener(this);

bt5.addActionListener(this);

bt6.addActionListener(this);

bt7.addActionListener(this);

bt8.addActionListener(this);

bt9.addActionListener(this);

bt0.addActionListener(this);

//清除、小數(shù)點、符號添加監(jiān)聽

bt_clear.addActionListener(this);

bt_dian.addActionListener(this);

bt_fuhao.addActionListener(this);

//符號添加監(jiān)聽

bt_jia.addActionListener(this);

bt_jian.addActionListener(this);

bt_cheng.addActionListener(this);

bt_chu.addActionListener(this);

//計算符號添加監(jiān)聽

bt_jisuan.addActionListener(this);

}

public void actionPerformed(ActionEvent e)

{

//數(shù)字鍵

if(e.getSource()==bt1)

{tf1.setText(tf1.getText()+"1");}

else if(e.getSource()==bt2)

{