先来看看界面效果：
源码如下：
package test1;?import java.awt.Frame;import java.awt.TextField;import java.awt.Button;import java.awt.Panel;import java.awt.GridLayout;?import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;?import java.awt.event.ActionEvent;import java.awt.event.ActionListener;public class calculate {?? ?TextField tfResult;?? ?Button btNum[],btOper[],btPoint,btEqual,btBack,btSqrt,btPingfang,btLifang;?? ?int num1,num2;//操作数?? ?char oper;//操作符?? ?boolean isNum;//代表数字标志位?? ?public void init(){?? ??? ?Frame f;?? ??? ??? ??? ?tfResult=new TextField();?? ??? ??? ??? ?btNum=new Button[10];//数组对象?? ??? ?for(int i=0;i<=9;i++){?? ??? ??? ?btNum[i]=new Button(i+"");?? ??? ?}?? ??? ?btOper=new Button[4];?? ??? ?btOper[0]=new Button("+");?? ??? ?btOper[1]=new Button("-");?? ??? ?btOper[2]=new Button("*");?? ??? ?btOper[3]=new Button("/");?? ??? ??? ??? ?btPoint=new Button(".");?? ??? ?btEqual=new Button("=");?? ??? ?btBack=new Button("Backspace");?? ??? ?btSqrt=new Button("Sqrt");?? ??? ?btPingfang=new Button("2");?? ??? ?btLifang=new Button("3");?? ??? ?f=new Frame("小羊羔的计算器！");?? ??? ??? ??? ?f.setSize(300,300);?? ??? ??? ??? ?//放置组件?? ??? ?f.add(tfResult,"North");?? ??? ?Panel panel=new Panel();?? ??? ?f.add(panel,"Center");?? ??? ?GridLayout gl=new GridLayout(5,4);?? ??? ?panel.setLayout(gl);?? ??? ?panel.add(btNum[1]);?? ??? ?panel.add(btNum[2]);?? ??? ?panel.add(btNum[3]);?? ??? ?panel.add(btOper[0]);?? ??? ??? ??? ?panel.add(btNum[4]);?? ??? ?panel.add(btNum[5]);?? ??? ?panel.add(btNum[6]);?? ??? ?panel.add(btOper[1]);?? ??? ??? ??? ?panel.add(btNum[7]);?? ??? ?panel.add(btNum[8]);?? ??? ?panel.add(btNum[9]);?? ??? ?panel.add(btOper[2]);?? ??? ??? ??? ?panel.add(btNum[0]);?? ??? ?panel.add(btPoint);?? ??? ?panel.add(btEqual);?? ??? ?panel.add(btOper[3]);?? ??? ??? ??? ?panel.add(btBack);?? ??? ?panel.add(btSqrt);?? ??? ?panel.add(btPingfang);?? ??? ?panel.add(btLifang);?? ??? ?f.setVisible(true);?? ??? ??? ??? ?//注册监听?? ??? ?f.addWindowListener(new MyWinLis());?? ??? ?//数字按钮注册监听?? ??? ?MyNumLis mnl=new MyNumLis();?? ??? ?for(int i=0;i<=9;i++)?? ??? ??? ?btNum[i].addActionListener(mnl);?? ??? ??? ??? ?//操作符按钮注册监听?? ??? ?MyOperLis mol=new MyOperLis();?? ??? ?for(int j=0;j<=3;j++)?? ??? ??? ?btOper[j].addActionListener(mol);?? ??? ?//等号按钮注册监听?? ??? ?MyEqualLis mel=new MyEqualLis();?? ??? ?btEqual.addActionListener(mel);?? ??? ?//删除按钮注册监听?? ??? ?MyBackLis mbl=new MyBackLis();?? ??? ?btBack.addActionListener(mbl);?? ??? ?//开根号按钮注册监听?? ??? ?MySqrtLis msl=new MySqrtLis();?? ??? ?btSqrt.addActionListener(msl);?? ??? ?//平方按钮注册监听?? ??? ?MyPingfangLis mpl=new MyPingfangLis();?? ??? ?btPingfang.addActionListener(mpl);?? ??? ?//百分号注册监听?? ??? ?MyLifangLis mll=new MyLifangLis();?? ??? ?btLifang.addActionListener(mll);?? ?}?? ?//定义监听器类?? ?class MyNumLis implements ActionListener{?? ??? ?public void actionPerformed(ActionEvent e){?? ??? ??? ?String t=e.getActionCommand();?? ??? ??? ?String s=tfResult.getText();?? ??? ??? ?if(isNum==false)?? ??? ??? ??? ?tfResult.setText(t);?? ??? ??? ?else??? ??? ??? ??? ?tfResult.setText(s+t);?? ??? ??? ?isNum=true;?? ??? ?}?? ?}?? ?class MySqrtLis implements ActionListener{?? ??? ?public void actionPerformed(ActionEvent e){?? ??? ??? ?double t=Double.parseDouble(tfResult.getText());?? ??? ??? ?tfResult.setText(Math.sqrt(t)+"");?? ??? ??? ?isNum=false;?? ??? ?}?? ?}?? ?class MyPingfangLis implements ActionListener{?? ??? ?public void actionPerformed(ActionEvent e){?? ??? ??? ?num1=Integer.parseInt(tfResult.getText());?? ??? ??? ?tfResult.setText(num1*num1+"");?? ??? ?}?? ?}?? ?class MyLifangLis implements ActionListener{?? ??? ?public void actionPerformed(ActionEvent e){?? ??? ??? ?num1=Integer.parseInt(tfResult.getText());?? ??? ??? ?tfResult.setText(num1*num1*num1+"");?? ??? ?}?? ?}?? ?class MyOperLis implements ActionListener{?? ??? ?public void actionPerformed(ActionEvent e){?? ??? ??? ?num1=Integer.parseInt(tfResult.getText());//转化为INT?? ??? ??? ?oper=e.getActionCommand().charAt(0);?? ??? ??? ?isNum=false;?? ??? ?}?? ?}?? ?class MyEqualLis implements ActionListener{?? ??? ?public void actionPerformed(ActionEvent e){?? ??? ??? ?int result=0;?? ??? ??? ?isNum=false;?? ??? ??? ?num2=Integer.parseInt(tfResult.getText());?? ??? ??? ?switch(oper){?? ??? ??? ??? ?case '+':result=num1+num2;break;?? ??? ??? ??? ?case '-':result=num1-num2;break;?? ??? ??? ??? ?case '*':result=num1*num2;break;?? ??? ??? ??? ?case '/':result=num1/num2;break;?? ??? ??? ?}?? ??? ??? ?tfResult.setText(result+"");?? ??? ?}?? ?}?? ?class MyBackLis implements ActionListener{?? ??? ?public void actionPerformed(ActionEvent e){?? ??? ??? ?tfResult.setText("");?? ??? ??? ?isNum=false;?? ??? ?}?? ?}?? ?class MyWinLis extends WindowAdapter{?? ??? ?public void windowClosing(WindowEvent e){?? ??? ??? ?e.getWindow().setVisible(false);?? ??? ??? ?e.getWindow().dispose();?? ??? ??? ?System.exit(0);?? ??? ?}?? ?}?? ??? ?public static void main(String[] args) {?? ??? ?// TODO Auto-generated method stub?? ??? ?new calculate().init();?? ?}?}
11×5=？界面如下：
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对人性的弱点有清醒的认识，
