Java如何实现一个简单计算器

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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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