java计算器 图形用户界面 升级版 v1.02

package com.rgy.entity;import java.awt.BorderLayout;import java.awt.Font;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.BorderFactory;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.WindowConstants;@SuppressWarnings("serial")public class Calculator2 extends JFrame{// 声明辅助变量private String str = "0";// 保存显示框中的字符串private String show_str="";// 保存副显示框中的字符串private double num_record = 0;// 记录当前数据的值private int operator = 0;// 记录当前运算符类型private int count_point=0;// 记录小数点个数，避免重复输入小数点// 声明并初始化各个组件private JTextField text_show = new JTextField("0");private JTextField text_show1 = new JTextField();private JPanel panel_up = new JPanel();private JPanel panel_CEandC = new JPanel();private JPanel panel_keys = new JPanel();private JButton button_CE = new JButton("CE");private JButton button_C = new JButton("C");private JButton button_num0 = new JButton("0");private JButton button_num1 = new JButton("1");private JButton button_num2 = new JButton("2");private JButton button_num3 = new JButton("3");private JButton button_num4 = new JButton("4");private JButton button_num5 = new JButton("5");private JButton button_num6 = new JButton("6");private JButton button_num7 = new JButton("7");private JButton button_num8 = new JButton("8");private JButton button_num9 = new JButton("9");private JButton button_division = new JButton("/");private JButton button_multiplication = new JButton("*");private JButton button_cut = new JButton("-");private JButton button_add = new JButton("+");private JButton button_equal = new JButton("=");private JButton button_point = new JButton(".");public Calculator2(String s) {super(s);this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);this.setBounds(500,250,270,400);this.setVisible(true);//设置显示框text_show.setHorizontalAlignment(JTextField.RIGHT);text_show.setFont(new Font("Default", 0, 30));text_show.setEditable(false);// 不可编辑text_show1.setHorizontalAlignment(JTextField.RIGHT);text_show1.setFont(new Font("Default", 0, 16));text_show1.setEditable(false);// 设置布局及边框panel_up.setLayout(new BorderLayout());button_CE.setBorder(BorderFactory.createRaisedBevelBorder());button_C.setBorder(BorderFactory.createRaisedBevelBorder());button_CE.setFont(new Font("Default", 1, 20));button_C.setFont(new Font("Default", 1, 20));panel_up.setBorder(BorderFactory.createEtchedBorder ());panel_CEandC.setLayout(new GridLayout(1, 2, 7, 7));panel_keys.setLayout(new GridLayout(4, 4, 7, 7));// 面板的嵌套panel_up.add(text_show1, BorderLayout.NORTH);panel_up.add(text_show, BorderLayout.CENTER);panel_up.add(panel_CEandC, BorderLayout.SOUTH);this.add(panel_up, BorderLayout.NORTH);this.add(panel_keys, BorderLayout.CENTER);//在面板上添加按钮panel_CEandC.add(button_CE);panel_CEandC.add(button_C);panel_keys.add(button_num7);panel_keys.add(button_num8);panel_keys.add(button_num9);panel_keys.add(button_division);panel_keys.add(button_num4);panel_keys.add(button_num5);panel_keys.add(button_num6);panel_keys.add(button_multiplication);panel_keys.add(button_num1);panel_keys.add(button_num2);panel_keys.add(button_num3);panel_keys.add(button_cut);panel_keys.add(button_num0);panel_keys.add(button_point);panel_keys.add(button_equal);panel_keys.add(button_add);//添加事件（匿名内部类）button_num0.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (text_show.getText().equals("0")) {text_show.setText("");}str = text_show.getText() + "0";text_show.setText(str);}});button_num1.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (operator != 5) {if (text_show.getText().equals("0")) {text_show.setText("");}str = text_show.getText() + "1";text_show.setText(str);} else {setClear();str = text_show.getText() + "1";text_show.setText(str);}}});button_num2.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (operator != 5) {if (text_show.getText().equals("0")) {text_show.setText("");}str = text_show.getText() + "2";text_show.setText(str);} else {setClear();str = text_show.getText() + "2";text_show.setText(str);}}});button_num3.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (operator != 5) {if (text_show.getText().equals("0")) {text_show.setText("");}str = text_show.getText() + "3";text_show.setText(str);} else {setClear();str = text_show.getText() + "3";text_show.setText(str);}}});button_num4.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (operator != 5) {if (text_show.getText().equals("0")) {text_show.setText("");}str = text_show.getText() + "4";text_show.setText(str);} else {setClear();str = text_show.getText() + "4";text_show.setText(str);}}});button_num5.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (operator != 5) {if (text_show.getText().equals("0")) {text_show.setText("");}str = text_show.getText() + "5";text_show.setText(str);} else {setClear();str = text_show.getText() + "5";text_show.setText(str);}}});button_num6.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (operator != 5) {if (text_show.getText().equals("0")) {text_show.setText("");}str = text_show.getText() + "6";text_show.setText(str);} else {setClear();str = text_show.getText() + "6";text_show.setText(str);}}});button_num7.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (operator != 5) {if (text_show.getText().equals("0")) {text_show.setText("");}str = text_show.getText() + "7";text_show.setText(str);} else {setClear();str = text_show.getText() + "7";text_show.setText(str);}}});button_num8.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (operator != 5) {if (text_show.getText().equals("0")) {text_show.setText("");}str = text_show.getText() + "8";text_show.setText(str);} else {setClear();str = text_show.getText() + "8";text_show.setText(str);}}});button_num9.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (operator != 5) {if (text_show.getText().equals("0")) {text_show.setText("");}str = text_show.getText() + "9";text_show.setText(str);} else {setClear();str = text_show.getText() + "9";text_show.setText(str);}}});button_point.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if(count_point==0){str=text_show.getText()+".";text_show.setText(str);count_point++;}else{//如果小数点个数超过一个就不再输入小数点return;}}});button_C.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {//全部清空，包括数据和运算符setClear();text_show.setText("0");}});button_CE.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if(operator==5){//对于按过等号的数据，则全部清空num_record=0;str="";text_show.setText("0");}else{//没按过等号的从低到高位依次减少位数if(str.length()!=0){//如果显示框中的数据长度不为0str=text_show.getText();str=str.substring(0,str.length()-1);if(str.length()>1){text_show.setText(str);}else{str="";text_show.setText("0");}}}}});button_add.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (str.equals("")) {} else {switch (operator) {case 0:num_record = Double.parseDouble(str);break;case 1:num_record = num_record + Double.parseDouble(str);break;case 2:num_record = num_record - Double.parseDouble(str);break;case 3:num_record = num_record * Double.parseDouble(str);break;case 4:num_record = num_record / Double.parseDouble(str);break;case 5:break;}show_str=show_str+text_show.getText()+"+";text_show1.setText(show_str);str="";text_show.setText("");operator=1;}}});button_cut.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if(text_show.getText().equals("0")){if(operator==0){//负号的功能str="-";text_show.setText(str);}else{return;}}else{if (str.equals("")) {} else {switch (operator) {case 0:num_record = Double.parseDouble(str);break;case 1:num_record = num_record + Double.parseDouble(str);break;case 2:num_record = num_record - Double.parseDouble(str);break;case 3:num_record = num_record * Double.parseDouble(str);break;case 4:num_record = num_record / Double.parseDouble(str);break;case 5:break;}show_str=show_str+text_show.getText()+"-";text_show1.setText(show_str);str="";text_show.setText("");operator=2;}}}});button_multiplication.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (str.equals("")) {} else {switch (operator) {case 0:num_record = Double.parseDouble(str);break;case 1:num_record = num_record + Double.parseDouble(str);break;case 2:num_record = num_record - Double.parseDouble(str);break;case 3:num_record = num_record * Double.parseDouble(str);break;case 4:num_record = num_record / Double.parseDouble(str);break;case 5:break;}show_str = show_str + text_show.getText() + "*";text_show1.setText(show_str);str="";text_show.setText("");operator=3;}}});button_division.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (str.equals("")) {} else {switch (operator) {case 0:num_record = Double.parseDouble(str);break;case 1:num_record = num_record + Double.parseDouble(str);break;case 2:num_record = num_record - Double.parseDouble(str);break;case 3:num_record = num_record * Double.parseDouble(str);break;case 4:num_record = num_record / Double.parseDouble(str);break;case 5:break;}}show_str = show_str + text_show.getText()+"/";text_show1.setText(show_str);str="";text_show.setText("");operator=4;}});button_equal.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {if (str.equals("")) {} else {switch (operator) {case 0:num_record = Double.parseDouble(str);break;case 1:num_record = num_record + Double.parseDouble(str);break;case 2:num_record = num_record - Double.parseDouble(str);break;case 3:num_record = num_record * Double.parseDouble(str);break;case 4:num_record = num_record / Double.parseDouble(str);break;case 5:break;}}show_str="";//输出显示text_show1.setText("");if(num_record-(int)num_record==0){text_show.setText(""+(int)num_record); }else{//保留总共15位数字，确保显示框能装下if((""+num_record).length()>15){text_show.setText((""+num_record).substring(0,15));}else{text_show.setText(""+num_record);}}operator=5;}});}public void setClear(){//清除num_record=0;operator=0;count_point=0;str="";text_show.setText("");show_str="";text_show1.setText("");}public static void main(String args[]) {new Calculator2("计算器v1.02");}}