java计算器程序代码，图形化界面

实现了加减乘除，平方立方开根号以及小数点运算，代码如下：

package test1;import java.awt.*;import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;import javax.swing.*;
import javax.swing.border.LineBorder;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;import javax.swing.border.Border;
import javax.swing.border.TitledBorder;
public class calculate {TextField Screen;Button btNum[],btoperator[],btPoint,btEqual,btBack,btSqrt,btPingfang,btLifang;double num1,num2;//操作数char operator;//操作符boolean isNumber=true;//代表数字标志位public void init(){Frame f;btNum=new Button[10];//数组对象for(int i=0;i<=9;i++){btNum[i]=new Button(i+"");btNum[i].setFont(new Font("Cambria", Font.BOLD, 16));//设置字体}btoperator=new Button[4];btoperator[0]=new Button("+");btoperator[0].setBackground(new Color(181, 196, 186, 255));//设置颜色btoperator[0].setFont(new Font("Cambria", Font.BOLD, 16));btoperator[1]=new Button("-");btoperator[1].setBackground(new Color(181, 196, 186, 255));btoperator[1].setFont(new Font("Cambria", Font.BOLD, 16));btoperator[2]=new Button("*");btoperator[2].setBackground(new Color(181, 196, 186, 255));btoperator[2].setFont(new Font("Cambria", Font.BOLD, 16));btoperator[3]=new Button("/");btoperator[3].setBackground(new Color(181, 196, 186, 255));btoperator[3].setFont(new Font("Cambria", Font.BOLD, 16));btPoint=new Button(".");btPoint.setFont(new Font("Cambria", Font.BOLD, 16));btEqual=new Button("=");btEqual.setFont(new Font("Cambria", Font.BOLD, 16));btBack=new Button("Backspace");btBack.setBackground(new Color(181, 196, 186, 255));btBack.setFont(new Font("Cambria", Font.BOLD, 16));btSqrt=new Button("Sqrt");btSqrt.setBackground(new Color(181, 196, 186, 255));btSqrt.setFont(new Font("Cambria", Font.BOLD, 16));btPingfang=new Button("x^2");btPingfang.setBackground(new Color(181, 196, 186, 255));btPingfang.setFont(new Font("Cambria", Font.BOLD, 16));btLifang=new Button("x^3");btLifang.setBackground(new Color(181, 196, 186, 255));btLifang.setFont(new Font("Cambria", Font.BOLD, 16));f=new Frame("Java计算器");f.setBounds(200,300,600,250);//放置组件Screen=new TextField("");Screen.setBackground(new Color(255, 192, 102));Screen.setFont(new Font("Cambria", Font.BOLD, 16));f.add(Screen,"Center" );JPanel panel = new JPanel();panel.setBorder(new LineBorder(Color.lightGray,1));f.add(panel,"South");GridLayout gl=new GridLayout(5,4);panel.setLayout(gl);panel.add(btNum[1]);panel.add(btNum[2]);panel.add(btNum[3]);panel.add(btoperator[0]);panel.add(btNum[4]);panel.add(btNum[5]);panel.add(btNum[6]);panel.add(btoperator[1]);panel.add(btNum[7]);panel.add(btNum[8]);panel.add(btNum[9]);panel.add(btoperator[2]);panel.add(btNum[0]);panel.add(btPoint);panel.add(btEqual);panel.add(btoperator[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MyoperatorLis mol=new MyoperatorLis();for(int j=0;j<=3;j++)btoperator[j].addActionListener(mol);//等号按钮注册监听MyEqualLis mel=new MyEqualLis();btEqual.addActionListener(mel);//小数点按钮注册监听MyPointLis mdl=new MyPointLis();btPoint.addActionListener(mdl);//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=Screen.getText();if(isNumber==false) {Screen.setText(t);}else {Screen.setText(s+t);}isNumber=true;}}class MySqrtLis implements ActionListener{public void actionPerformed(ActionEvent e){double t=Double.parseDouble(Screen.getText());Screen.setText(Math.sqrt(t)+"");}}class MyPointLis implements ActionListener{public void actionPerformed(ActionEvent e){String s=Screen.getText();Screen.setText(s+'.');}}class MyPingfangLis implements ActionListener{public void actionPerformed(ActionEvent e){num1=Integer.parseInt(Screen.getText());Screen.setText(num1*num1+"");}}class MyLifangLis implements ActionListener{public void actionPerformed(ActionEvent e){num1=Integer.parseInt(Screen.getText());Screen.setText(num1*num1*num1+"");}}class MyoperatorLis implements ActionListener{public void actionPerformed(ActionEvent e){num1=Double.parseDouble(Screen.getText());//转化为DOUBLEoperator=e.getActionCommand().charAt(0);String s=Screen.getText();Screen.setText(s+operator);isNumber=true;}}class MyEqualLis implements ActionListener{public void actionPerformed(ActionEvent e){double result=0;String str = Screen.getText();switch(operator){case '+':String[] arr1 = str.split("\\+");num2=Double.parseDouble(arr1[1]);result=num1+num2;break;case '-':String[] arr2 = str.split("\\-");num2=Double.parseDouble(arr2[1]);result=num1-num2;break;case '*':String[] arr3 = str.split("\\*");num2=Double.parseDouble(arr3[1]);result=num1*num2;break;case '/':String[] arr4 = str.split("\\/");num2=Double.parseDouble(arr4[1]);result=num1/num2;break;}Screen.setText(result+"");isNumber=false;}}class MyBackLis implements ActionListener{public void actionPerformed(ActionEvent e){Screen.setText("");isNumber=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 stubcalculate c = new calculate();c.init();}
}

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