java实现简单计算器功能

java实现简单计算器功能

使用java来实现一个简单的计算器，供大家参考，具体内容如下

最近使用java制作了一个计算器，菜单栏里的功能没有实现，只是写一个版式，仅仅实现了计算功能 ，如果想要实现菜单栏功能可自行在该代码的基础上去实现。

话不多说直接上代码

package test;

import javax.swing.*;

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class calculate extends JFrame implements ActionListener {

private Container ct;

private JButton[] jbs;

private String[] str;

private JTextField jTextField;

//cal[0]用来存储第一次输入的数

//cal[1]用来存储运算符（+，-，*，/，%）

//cal[2]用来存储第二次输入的数

//cal[3]用来存储结果

//cal[4]用来存储MS键所存储的数

//cal[5]用来获取要存入的值(用来给cal[4]赋值)

private String[] cal = {"","","","","",""};

//_count和_count1始终相反,如果_count为true则表示正在输入cal[0]反之表示cal[0]输入完成，该输入cal[2]

//当点过等号后将cal[3]的值赋给cal[0]

private boolean _count = true;

private boolean _count1 = false;

public calculate() {

super("计算器");

jbs = new JButton[28];

ct = this.getContentPane();

this.setBounds(100, 100, 315, 400);

this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

ct.setLayout(null);

//菜单栏

JMenuBar jMenuBar = new JMenuBar();

JMenu jm = new JMenu("查看(V)");

JMenu jm1 = new JMenu("编辑(E)");

JMenu jm2 = new JMenu("帮助(H)");

jMenuBar.add(jm);

jMenuBar.add(jm1);

jMenuBar.add(jm2);

this.setJMenuBar(jMenuBar);

//输出框

jTextField = new JTextField("0");

jTextField.setFont(new Font("宋体", Font.BOLD, 25));

jTextField.setEditable(false);

jTextField.setHorizontalAlignment(JTextField.RIGHT);

jTextField.setBounds(5, 5, 285, 65);

ct.add(jTextField);

//按键 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

str = new String[]{"MC", "MR", "MS", "M+", "M-", "←", "CE", "C", "", "√", "7", "8", "9", "/", "%", "4", "5", "6", "*", "1/x", "1", "2", "3", "-", "=", "0", ".", "+"};

int k = 0;

for (int i = 75; i <= 195; i = i + 40) {

for (int init = 10; init <= 290; init = init + 57) {

JButton jButton = new JButton(str[k]);

jbs[k] = jButton;

jButton.setBounds(init, i, 52, 35);

ct.add(jButton);

k++;

System.out.println(k);

}

}

for (int i = 235; i < 265; i = i + 40) {

for (int j = 10; j <= 181; j = j + 57) {

JButton jButton = new JButton(str[k]);

jButton.setBounds(j, i, 52, 35);

ct.add(jButton);

jbs[k] = jButton;

k++;

System.out.println(k);

}

}

JButton jButton = new JButton(str[k]);

jbs[k] = jButton;

k++;

System.out.println(k);

jButton.setBounds(240, 235, 52, 75);

ct.add(jButton);

JButton jButton2 = new JButton(str[k]);

System.out.println(str[k]);

jButton2.setBounds(10, 275, 109, 35);

ct.add(jButton2);

jbs[k] = jButton2;

k++;

for (int i = 275; i < 310; i = i + 40) {

for (int j = 124; j <= 181; j = j + 57) {

JButton jButton1 = new JButton(str[k]);

jButton1.setBounds(j, i, 52, 35);

ct.add(jButton1);

jbs[k] = jButton1;

k++;

}

}

for (int i = 0; i < 28; i++) {

jbs[i].addActionListener(this);

}

this.setVisible(true);

}

public static void main(String[] args) {

new calculate();

}

@Override

public void actionPerformed(ActionEvent actionEvent) {

if (actionEvent.getActionCommand().equals(".")){

method(actionEvent);

}else if (actionEvent.getActionCommand().equals("0")){

method(actionEvent);

} else if (actionEvent.getActionCommand().equals("1")){

method(actionEvent);

}else if(actionEvent.getActionCommand().equals("2")){

method(actionEvent);

}else if (actionEvent.getActionCommand().equals("3")){

method(actionEvent);

}else if (actionEvent.getActionCommand().equals("4")){

method(actionEvent);

}else if (actionEvent.getActionCommand().equals("5")){

method(actionEvent);

}else if (actionEvent.getActionCommand().equals("6")){

method(actionEvent);

}else if (actionEvent.getActionCommand().equals("7")){

method(actionEvent);

}else if (actionEvent.getActionCommand().equals("8")){

method(actionEvent);

}else if (actionEvent.getActionCommand().equals("9")){

method(actionEvent);

}else if (actionEvent.getActionCommand().equals("")){

if(_count){

if (cal[0].contains(".")){

cal[0] = String.valueOf(Double.parseDouble(cal[0]) * (-1));

jTextField.setText(cal[0]);

}else {

cal[0] = String.valueOf(Integer.parseInt(cal[0]) * (-1));

jTextField.setText(cal[0]);

}

}else {

if (cal[2].contains(".")){

cal[2] = String.valueOf(Double.parseDouble(cal[2]) * (-1));

jTextField.setText(cal[2]);

}else {

cal[2] = String.valueOf(Integer.parseInt(cal[2]) * (-1));

jTextField.setText(cal[2]);

}

}

}else if(actionEvent.getActionCommand().equals("√")){

if(_count){

cal[0] = String.valueOf(Math.pow(Double.parseDouble(cal[0]),0.5));

jTextField.setText(cal[0]);

}else {

cal[2] = String.valueOf(Math.pow(Double.parseDouble(cal[2]),0.5));

jTextField.setText(cal[2]);

}

}else if(actionEvent.getActionCommand().equals("1/x")){

if(_count){

cal[0] = String.valueOf(1/Double.parseDouble(cal[0]));

jTextField.setText(cal[0]);

}else {

cal[2] = String.valueOf(1/Double.parseDouble(cal[2]));

jTextField.setText(cal[2]);

}

}else if(actionEvent.getActionCommand().equals("←")){

if(_count){

cal[0] = cal[0].substring(0,cal[0].length()-1);

if(cal[0].equals("")){

jTextField.setText("0");

}else {

jTextField.setText(cal[0]);

}

}else {

cal[2] = cal[2].substring(0,cal[2].length()-1);

if(cal[2].equals("")){

jTextField.setText("0");

}else {

jTextField.setText(cal[2]);

}

}

}else if(actionEvent.getActionCommand().equals("CE")){

if (_count){

cal[0]="";

jTextField.setText("0");

}else {

cal[2]="";

jTextField.setText("0");

}

}else if(actionEvent.getActionCommand().equals("C")){

_count = true;

cal[0]="";

cal[1]="";

cal[2]="";

cal[3]="";

jTextField.setText("0");

}else if (actionEvent.getActionCommand().equals("+")){

if (!cal[0].equals("")&&!cal[2].equals("")){

if (cal[0].contains(".") || cal[2].contains(".")){

cal[0]=String.valueOf(Double.parseDouble(cal[0]) + Double.parseDouble(cal[2]));

}else {

cal[0] = String.valueOf(Integer.parseInt(cal[0]) + Integer.parseInt(cal[2]));

}

cal[2]="";

}

cal[1] = "+";

_count=false;

jTextField.setText(cal[1]);

}else if (actionEvent.getActionCommand().equals("-")){

if (!cal[0].equals("")&&!cal[2].equals("")){

if (cal[0].contains(".") || cal[2].contains(".")){

cal[0]=String.valueOf(Double.parseDouble(cal[0]) - Double.parseDouble(cal[2]));

}else {

cal[0] = String.valueOf(Integer.parseInt(cal[0]) - Integer.parseInt(cal[2]));

}

cal[2]="";

}

cal[1] = "-";

_count=false;

jTextField.setText(cal[1]);

}else if (actionEvent.getActionCommand().equals("*")){

if (!cal[0].equals("")&&!cal[2].equals("")){

if (cal[0].contains(".") || cal[2].contains(".")){

cal[0]=String.valueOf(Double.parseDouble(cal[0]) * Double.parseDouble(cal[2]));

}else {

cal[0] = String.valueOf(Integer.parseInt(cal[0]) * Integer.parseInt(cal[2]));

}

cal[2]="";

}

cal[1] = "*";

_count=false;

jTextField.setText(cal[1]);

}else if (actionEvent.getActionCommand().equals("/")){

if (!cal[0].equals("")&&!cal[2].equals("")){

if (cal[0].contains(".") || cal[2].contains(".")){

cal[0]=String.valueOf(DoubIUhjDkMadle.parseDouble(cal[0]) / Double.parseDouble(cal[2]));

}else {

cal[0] = String.valueOf(Integer.parseInt(cal[0]) / Integer.parseInt(cal[2]));

}

cal[2]="";

}

cal[1] = "/";

_count=false;

jTextField.setText(cal[1]);

}else if (actionEvent.getActionCommand().equals("%")){

cal[0]=String.valueOf(Integer.parseInt(cal[0]) % Integer.parseInt(cal[2]));

cal[2]="";

cal[1] = "%";

_count=false;

jTextField.setText(cal[1]);

}else if (actionEvent.getActionCommand().equals("=")){

if(cal[0].equals("")&&cal[2].equals("")){

jTextField.setText("0");

}else if(!cal[0].equals("")&&cal[2].equals("")){

jTextField.setText(cal[0]);

}else if(!cal[0].equals("")&&!cal[2].equals("")){

if(cal[1].equals("+")){

if (cal[0].contains(".") || cal[2].contains(".")){

cal[3]=String.valueOf(Double.parseDouble(cal[0]) + Double.parseDouble(cal[2]));

}else {

cal[3] = String.valueOf(Integer.parseInt(cal[0]) + Integer.parseInt(cal[2]));

}

jTextField.setText(cal[3]);

}else if (cal[1].equals("-")){

if (cal[0].contains(".") || cal[2].contains(".")){

cal[3]=String.valueOf(Double.parseDouble(cal[0]) - Double.parseDouble(cal[2]));

}else {

cal[3] = String.valueOf(Integer.parseInt(cal[0]) - Integer.parseInt(cal[2]));

}

jTextField.setText(cal[3]);

}else if(cal[1].equals("*")){

if (cal[0].contains(".") || cal[2].contains(".")){

cal[3]=String.valueOf(Double.parseDouble(cal[0]) * Double.parseDouble(cal[2]));

}else {

cal[3] = String.valueOf(Integer.parseInt(cal[0]) * Integer.parseInt(cal[2]));

}

jTextField.setText(cal[3]);

}else if (cal[1].equals("/")){

if (cal[0].contains(".") || cal[2].contains(".")){

cal[3]=String.valueOf(Double.parseDouble(cal[0]) / Double.parseDouble(cal[2]));

}else {

cal[3] = String.valueOf(Integer.parseInt(cal[0]) / Integer.parseInt(cal[2]));

}

jTextField.setText(cal[3]);

}else if (cal[1].equals("%")){

cal[3]=String.valueOf(Integer.parseInt(cal[0]) % Integer.parseInt(cal[2]));

jTextField.setText(cal[3]);

}

}

cal[0]=cal[3];

cal[2]="";

_count=true;

_count1 = true;

cal[5]=cal[0];

}else if(actionEvent.getActionCommand().equals("MC")){

cal[4]="";

}else if(actionEvent.getActionCommand().equals("MR")){

if(_count){

if(!cal[4].equals("")){

cal[0]=cal[4];

jTextField.setText(cal[0]);

}

}else {

if(!cal[4].equals("")){

cal[2]=cal[4];

jTextField.setText(cal[2]);

}

}

}else if(actionEvent.getActionCommand().equals("MS")){

if(_count){

cal[0]="";

}

cal[4]=cal[5];

System.out.println("cal[5]"+cal[5]);

System.out.println("ms:"+cal[4]);

}else if(actionEvent.getActionCommand().equals("M+")){

if(!cal[4].equals("")){

if (cal[4].contains(".") || cal[5].contains(".")){

cal[4]=String.valueOf(Double.parseDouble(cal[4]) + Double.parseDouble(cal[5]));

}else {

cal[4] = String.valueOf(Integer.parseInt(cal[4]) + Integer.parseInt(cal[5]));

}

}

}else if(actionEvent.getActionCommand().equals("M-")){

if(!cal[4].equals("")){

if (cal[4].contains(".") || cal[5].contains(".")){

cal[4]=String.valueOf(Double.parseDouble(cal[4]) - Double.parseDouble(cal[5]));

}else {

cal[4] = String.valueOf(Integer.parseInt(cal[4]) - Integer.parseInt(cal[5]));

}

}

}

}

public voIUhjDkMadid method(ActionEvent actionEvent){

if(_count){

if (_count1){

cal[0]="";

_count1=false;

}

cal[0] += actionEvent.getActionCommand();

cal[5]=cal[0];

System.out.println(cal[5]);

}else {

cal[2] += actionEvent.getActionCommand();

cal[5]=cal[2];

}

jTextField.setText(actionEvent.getActionCommand());

}

}

效果图:

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