JAVA计算器小程序

要求：
界面设计：
1.顶级类是Frame
2.声明一个JTextField和Panel
3.在Panel中添加Button
4.将JTextField和Panel添加到顶级类
5.数字按钮0－9是一个类
6.符号按钮＋ - * / 是一个类
7.分别设置返回数字和符号的方法
8.其他6个通过Button直接创建

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.lang.*;
import javax.swing.*;
import java.util.*;

public class CalculatorA {
private JFrame jf;
private JButton[] jbs;
private JTextField jtf;
private JButton clear;
private double num1,num2,jieguo;
private char c;

public CalculatorA(){
jf=new JFrame("我的计算器v1.0");
jtf=new JTextField(20);
clear=new JButton("clear");
jbs=new JButton[16];
String str="123+456-789*0./=";
for(int i=0; i<str.length(); i++){
jbs[i]=new JButton(str.charAt(i)+"");
}
init();
addEventHandler();
// setFont();
// setColor();
showMe();
}


public void init(){
// jf.setLayout(manager)
JPanel jp1=new JPanel();
jp1.add(jtf);

JPanel jp2=new JPanel();
jp2.setLayout(new GridLayout(4,4));
for(int i=0; i<16; i++){
jp2.add(jbs[i]);
}
JPanel jp3=new JPanel();
jp3.add(clear);
jf.add(jp1,BorderLayout.NORTH);
jf.add(jp2,BorderLayout.CENTER);
jf.add(jp3,BorderLayout.SOUTH);
}

public void setFont(){

}

public void setColor(){

}
public void addEventHandler(){
ActionListener lis=new ActionListener(){

public void actionPerformed(ActionEvent e){
// TODO Auto-generated method stub
JButton jb=(JButton)e.getSource();
// String key=(String)e.getActionCommand();
String str =jb.getText().trim();//把字符串的首尾空格去掉！
// String str2=e.getActionCommand().trim();//返回事件源的文本内容
if("0123456789.".indexOf(str)!=-1){//如果是数字或点号
jtf.setText(jtf.getText()+str);
return;
}
if("+-*/".indexOf(str)!=-1){
num1=Double.parseDouble(jtf.getText());

jtf.setText("");
c=str.charAt(0);
jtf.setText("");
return ;
}
if(str.equals("=")){
num2=Double.parseDouble(jtf.getText());
// jtf.setText("");
switch(c){
case '+': jieguo=num1+num2;break;
case '-': jieguo=num1-num2;break;
case '*': jieguo=num1*num2; break;
case '/': jieguo=num1/num2;break;
}
jtf.setText(Double.toString(jieguo));
return;
}

if(e.getActionCommand().equals("clear")){

jtf.setText("");
return;
}
}
};
for(int i=0; i<jbs.length; i++){

jbs[i].addActionListener(lis);
}
clear.addActionListener(lis);
}

public void showMe(){
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

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

}
}

楼主,你分也太少了吧1 帮你写个程序,这么点啊11 分稍微高一点, 我帮你弄出来../

import java.awt.*; import java.awt.event.*; public class computer implements WindowListener,ActionListener{ private Frame f; double d0,d1,d2,result; boolean flag=true; String s,oper; TextField tf1; Panel p=new Panel(); public static void main(String args[]) { computer e=new computer(); e.go(); } public void go(){ int i; result=0; s=new String(); oper=new String("+"); f=new Frame("计算器"); MenuBar mb=new MenuBar(); f.setMenuBar(mb); Menu m1=new Menu("编辑"); Menu m2=new Menu("帮助"); Menu m3=new Menu("关于"); mb.add(m1); mb.add(m3); mb.setHelpMenu(m2); tf1=new TextField("",15); Button[] b=new Button[21]; for(i=1;i<21;i++) { b[i]=new Button(); b[i].setFont(new Font("仿宋",0,16)); } b[1].setLabel("退格"); b[2].setLabel("CE"); b[3].setLabel("C"); b[4].setLabel("/"); b[5].setLabel("7"); b[6].setLabel("8"); b[7].setLabel("9"); b[8].setLabel("*"); b[9].setLabel("4"); b[10].setLabel("5"); b[11].setLabel("6"); b[12].setLabel("-"); b[13].setLabel("1"); b[14].setLabel("2"); b[15].setLabel("3"); b[16].setLabel("+"); b[17].setLabel("0"); b[18].setLabel("+/-"); b[19].setLabel("."); b[20].setLabel("="); p.setLayout(new GridLayout(5,4)); p.setBackground(new Color(80,30,100)); for(i=1;i<21;i++) { p.add(b[i]); b[i].addActionListener(this); b[i].setBackground(new Color(20,130,180)); b[i].setForeground(Color.yellow); } for(i=1;i<4;i++) { b[i].setBackground(new Color(120,180,170)); b[i].setForeground(Color.blue); } for(i=1;i<=4;i++) { b[i*4].setBackground(new Color(120,180,170)); b[i*4].setForeground(Color.red); } b[20].setBackground(Color.red); f.addWindowListener(this); f.setLayout(new BorderLayout()); f.add("North",tf1); f.add("Center",p); f.setSize(200,200); f.setVisible(true); } public void windowClosing(WindowEvent e){System.exit(1);} public void windowOpened(WindowEvent e){} public void windowIconified(WindowEvent e){} public void windowDeiconified(WindowEvent e){} public void windowClosed(WindowEvent e){} public void windowActivated(WindowEvent e){} public void windowDeactivated(WindowEvent e){} public void actionPerformed(ActionEvent e){ String i1=tf1.getText(); s=e.getActionCommand(); if(s=="0"| s=="1"|s=="2"|s=="3"|s=="4"|s=="5"|s=="6"|s=="7"|s=="8"|s=="9"|s==".") { if(flag) tf1.setText(i1+s); else { tf1.setText(s); flag=true; } } else if(s=="+"|s=="-"|s=="*"|s=="/") { result=Double.parseDouble(i1); flag=false; oper=s; } else if(s=="=") { d0=Double.parseDouble(i1); if(oper=="+") result+=d0; if(oper=="-") result-=d0; if(oper=="*") result*=d0; if(oper=="/") result/=d0; tf1.setText(Double.toString(result)); flag=false; } else if(s=="CE") { tf1.setText(""); flag=false; } else if(s=="C") { result=0; tf1.setText(""); flag=false; } else if(s=="退格") { String ss=tf1.getText(); int i=ss.length(); ss=ss.substring(0,i-1); tf1.setText(ss); } else if(s=="+/-") { d2=-1*Double.parseDouble(tf1.getText()); tf1.setText(Double.toString(d2)); } } }