JAVA 编写计算器 要代码最简单的

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import java.awt.*;

import java.lang.Object;

import java.lang.String;

import javax.swing.*;

import java.awt.event.*;

import java.awt.TextComponent;

//声明一个主类jisuanqi，继续窗口类Frame

public class jisuanqi extends Frame{

//声明16个Button

Button anjian1, anjian2, anjian3, anjian4, anjian5, anjian6, anjian7, anjian8, anjian9, anjian10, anjian11, anjian12, anjian13, anjian14,anjian15,anjian16;

//声明文本框，用于接收数字和计算

TextField numText;

//声明面板容器，用于存放各种按钮

Panel anjianPanel;

//构造方法初始化按钮

jisuanqi(String title){

super(title);

anjian1=new Button("0");

anjian2=new Button("1");

anjian3=new Button("2");

anjian4=new Button("3");

anjian5=new Button("4");

anjian6=new Button("5");

anjian7=new Button("6");

anjian8=new Button("7");

anjian9=new Button("8");

anjian10=new Button("9");

anjian11=new Button("+");

anjian12=new Button("-");

anjian13=new Button("*");

anjian14=new Button("/");

anjian15=new Button("=");

anjian16=new Button("清空");

//初始化文本框，将文本的值设置为“0”

numText=new TextField("0");

//实例化面板;

anjianPanel=new Panel();

//设置按钮

anjianPanel.setLayout(new FlowLayout());

//实例化按钮

anjian1.addActionListener(new anjianAction());

anjian2.addActionListener(new anjianAction());

anjian3.addActionListener(new anjianAction());

anjian4.addActionListener(new anjianAction());

anjian5.addActionListener(new anjianAction());

anjian6.addActionListener(new anjianAction());

anjian7.addActionListener(new anjianAction());

anjian8.addActionListener(new anjianAction());

anjian9.addActionListener(new anjianAction());

anjian10.addActionListener(new anjianAction());

anjian11.addActionListener(new anjianAction());

anjian12.addActionListener(new anjianAction());

anjian13.addActionListener(new anjianAction());

anjian14.addActionListener(new anjianAction());

anjian15.addActionListener(new anjianAction());

anjian16.addActionListener(new anjianAction());

//将各个按钮添加到面板容器中

anjianPanel.add(anjian1);

anjianPanel.add(anjian2);

anjianPanel.add(anjian3);

anjianPanel.add(anjian4);

anjianPanel.add(anjian5);

anjianPanel.add(anjian6);

anjianPanel.add(anjian7);

anjianPanel.add(anjian8);

anjianPanel.add(anjian9);

anjianPanel.add(anjian10);

anjianPanel.add(anjian11);

anjianPanel.add(anjian12);

anjianPanel.add(anjian13);

anjianPanel.add(anjian14);

anjianPanel.add(anjian15);

anjianPanel.add(anjian16);

//为文本框添加事件

numText.addTextListener(new TextListener() {

public void textValueChanged(TextEvent e) {

if(numText.getText().indexOf("0",0)!=-1){

numText.getText().replace("0","");

}

}

});

addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

//将文本框放置在顶部

add(numText,BorderLayout.NORTH);

//添加按钮

add(anjianPanel,BorderLayout.CENTER);

//设置文本框属性

numText.setEditable(false);

}

//没有任何操作的值

int num=0;

//numStr是文本框的值

String numStr=null;

Boolean chinage=false;

//设置按钮

public int check(){

numStr = numText.getText();

if (numStr.indexOf("+") == 0) {

numStr = numStr.replace('+', '0');

num = num + Integer.parseInt(numStr);

return num;

}else

if (numStr.indexOf("-") != -1) {

numStr = numStr.replace("-", "0");

num = num - Integer.parseInt(numStr);

return num;

}

else

if(numStr.indexOf("*")!=-1){

numStr=numStr.replace('*','0');

num = num * Integer.parseInt(numStr);

return num;

}

else

if(numStr.indexOf("/")!=-1){

numStr=numStr.replace('/','0');

try{

num = num / Integer.parseInt(numStr);

return num;

}catch(ArithmeticException e){

JOptionPane.showMessageDialog(null,"除数不能为空!","消息!",1);

return num;}}

else

return num=Integer.parseInt(numStr);}

//创建事件

private class anjianAction implements ActionListener{

public void actionPerformed(ActionEvent event){

if(event.getActionCommand()=="0"){

if(!numText.getText().equals("0"))

numText.setText(numText.getText()+0);}

if(event.getActionCommand()=="1")

numText.setText(numText.getText()+1);

if(event.getActionCommand()=="2")

numText.setText(numText.getText()+2);

if(event.getActionCommand()=="3")

numText.setText(numText.getText()+3);

if(event.getActionCommand()=="4")

numText.setText(numText.getText()+4);

if(event.getActionCommand()=="5")

numText.setText(numText.getText()+5);

if(event.getActionCommand()=="6")

numText.setText(numText.getText()+6);

if(event.getActionCommand()=="7")

numText.setText(numText.getText()+7);

if(event.getActionCommand()=="8")

numText.setText(numText.getText()+8);

if(event.getActionCommand()=="9")

numText.setText(numText.getText()+9);

if(event.getActionCommand()=="清空"){

numText.setText("0");

num=0;}

if(event.getActionCommand()=="+"){

//调用check();方法

check();

numText.setText("+");}

if(event.getActionCommand()=="-"){

check();

numText.setText("-");}

if(event.getActionCommand()=="*"){

check();

numText.setText("*");}

if(event.getActionCommand()=="/"){

if(numStr=="/0"){

JOptionPane.showMessageDialog(null,"除数不能为空!","消息!",1);}

check();

numText.setText("/");}

if(event.getActionCommand()=="="){

check();

numText.setText(""+num);}}}

public static void main(String[] args){

jisuanqi jisuanqi=new jisuanqi("计数器");

jisuanqi.setSize(300,280);

//设置窗口大小

jisuanqi.setLocation(550,350);

//设置界面属性

jisuanqi.setVisible(true);

}}

如有疑问请继续追问，我将竭尽全力为您解答

JAVA 编写计算器 要代码最简单的

学java的时候自己编的，很简单，能够连续输入计算式后进行计算

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.FlowLayout;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.text.NumberFormat;

import java.util.ArrayList;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

/**简易计算器，能够进行简单的计算

*

* @see 2008.12.9

*/

public class CalculatorA

implements ActionListener{

private JFrame frame;

private JTextField field;

private JButton[] allButtons;

private JButton clearButton;

// private JButton backButton;

String result="";//保存结果

StringBuilder sb = new StringBuilder();//保存要进行的计算式

int x = 0; //用来判断上一次的事件类型

String str = "123+456-789*0.=/";

ArrayListString arrayList = new ArrayListString();//保存计算式，通过方法进行运算

public CalculatorA(){

frame = new JFrame("我的计算器v1.1");

frame.setLocation(300,300);

field = new JTextField(25);

allButtons = new JButton[16];

for(int i=0;iallButtons.length;i++){

allButtons[i]= new JButton(str.substring(i,i+1));

}

clearButton = new JButton("CLEAR");

// backButton = new JButton("——");

init();

setFondAndColor();

addEventHander();

}

public void init(){

frame.setLayout(new BorderLayout());

JPanel northPanel = new JPanel();

JPanel centerPanel = new JPanel();

JPanel southPanel = new JPanel();

northPanel.setLayout(new FlowLayout());

centerPanel.setLayout(new GridLayout(4,4));

southPanel.setLayout(new FlowLayout());

northPanel.add(field);

for(int i=0;iallButtons.length;i++){

centerPanel.add(allButtons[i]);

}

southPanel.add(clearButton);

//southPanel.add(backButton);

frame.add(northPanel,BorderLayout.NORTH);

frame.add(centerPanel,BorderLayout.CENTER);

frame.add(southPanel,BorderLayout.SOUTH);

}

//设置输入字体

public void setFondAndColor(){

field.setFont(new Font("宋体",Font.BOLD,24));

field.setBackground(new Color(100,200,200));

field.setForeground(Color.RED);

//设置字体从右起始

field.setHorizontalAlignment(JTextField.RIGHT);

}

public void showMi(){

frame.pack();

frame.setResizable(false);

frame.setVisible(true);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public void addEventHander(){

for(int i=0;iallButtons.length;i++){

allButtons[i].addActionListener(this);

}

clearButton.addActionListener(this);

// backButton.addActionListener(this);

}

@Override

public void actionPerformed(ActionEvent e) {

String str = e.getActionCommand();//取得当前事件返回的值

if("0123456789.".indexOf(str)!=-1){

if(x == 0){ //当x为0时表示还没有进行输入

result=str;

sb.append(str);

field.setText(str);

x = 1;

}

else if(x == 1){

result = result +str;

sb.append(str);

field.setText(result);

x = 1;

}

else if(x == 2){

sb.delete(0,sb.length());

result = result+str;

sb.append(str);

field.setText(result);

x = 1;

}

else if(x == 3){

result = str;

sb.delete(0,sb.length());

arrayList.clear();

field.setText(str);

sb.append(str);

field.setText(str);

x = 1;

}

else if(x == 4){

result ="";

sb.delete(0,sb.length());

arrayList.clear();

result = str;

sb.append(str);

field.setText(str);

x = 1;

}

else{

result = result +str;

sb.append(str);

field.setText(result);

x = 1;

}

}

else if("+*-/".indexOf(str)!=-1){

if(x == 0){

field.setText("");

x = 2;

}

else if(x == 1){

result = result + str;

arrayList.add(sb.toString());

arrayList.add(str);

sb.append(str);

field.setText(result);

x = 2;

}

else if(x == 2){

x = 2;

}

else if(x == 3){

field.setText(result+str);

arrayList.add(result);

arrayList.add(str);

result = result+str;

x = 2;

}

else if(x == 4){

result ="";

sb.delete(0,sb.length());

arrayList.clear();

x = 2;

}

else{

field.setText(result+str);

arrayList.add(result);

arrayList.add(str);

result = result+str;

x = 2;

}

}

else if("=".equals(str)){

if(x == 0){

field.setText("0");

arrayList.clear();

result = "0";

x = 3;

}

else if(x == 1){

try{

arrayList.add(sb.toString());

arrayList = getResult(arrayList);

result = arrayList.get(0);

field.setText(result);

arrayList.clear();

x = 3;

}catch(Exception e1){

field.setText("数据格式异常");

x = 0;

}

}

else if(x == 2){

field.setText("数据格式错误.....");

arrayList.clear();

x = 0;

}

else if(x == 3){

field.setText(result);

x = 3;

}

else if(x == 4){

result ="";

sb.delete(0,sb.length());

arrayList.clear();

x = 3;

}

else {

try{

arrayList.add(sb.toString());

arrayList = getResult(arrayList);

result = arrayList.get(0);

field.setText(result);

arrayList.clear();

x = 3;

}catch(Exception e1){

field.setText("数据格式异常");

x = 0;

}

}

}

else if("CLEAR".equals(str)){

arrayList.clear();

field.setText("0");

arrayList.add("0");

x = 4;

}

else{

if(result.length()1){

result = result.substring(0,result.length()-1);

if(sb.length()0){

sb.delete(sb.length()-1,sb.length());

}

else {

sb.delete(0,1);

}

field.setText(result);

x = 5;

}

else{

result = "";

sb.delete(0,sb.length());

arrayList.clear();

field.setText("0");

x = 0;

}

}

}

public static ArrayListString getResult(ArrayListString list){

String res = null;

String[] s = {"/","*","-","+"};

int i=0;

if(list.size()1){

for(;is.length;){

if(s[i].equals("/")){

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))/Double.parseDouble(list.get(j+1)));

//本地的数据格式

NumberFormat nf = NumberFormat.getInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

list.remove(j);

getResult(list);

}

}

i++;

}

else if(s[i].equals("*")){

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))*Double.parseDouble(list.get(j+1)));

NumberFormat nf = NumberFormat.getInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

list.remove(j);

getResult(list);

}

}

i++;

}

else if(s[i].equals("-")){

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))-Double.parseDouble(list.get(j+1)));

NumberFormat nf = NumberFormat.getNumberInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

list.remove(j);

getResult(list);

}

}

i++;

}

else {

for(int j=0;jlist.size();j++){

if(list.get(j).equals(s[i])){

res = Double.toString(Double.parseDouble(list.get(j-1))+Double.parseDouble(list.get(j+1)));

NumberFormat nf = NumberFormat.getInstance();

res = nf.format(Double.parseDouble(res));

res = getChange(res);

list.set(j-1,res);

list.remove(j);

list.remove(j);

getResult(list);

}

}

i++;

}

}

}

return list;

}

//对数字字符串进行排除不必要符号

public static String getChange(String res){

String s_temp = "";

char[] c = new char[res.length()];

for(int k=0;kc.length;k++){

c[k] = res.charAt(k);

}

for(int k=0;kc.length;k++){

if((c[k]= '0' c[k]= '9')|| c[k] == '.'){

s_temp += c[k];

}

}

return s_temp;

}

public static void main(String[] args){

new CalculatorA().showMi();

}

}

给段最简单的java代码 让我新手看一下

最简单的java代码肯定就是这个了，如下：

public class MyFirstApp

{

public static void main(String[] args)

{

System.out.print("Hello world");

}

}

“hello world”就是应该是所有学java的新手看的第一个代码了。如果是零基础的新手朋友们可以来我们的java实验班试听，有免费的试听课程帮助学习java必备基础知识，有助教老师为零基础的人提供个人学习方案，学习完成后有考评团进行专业测试，帮助测评学员是否适合继续学习java，15天内免费帮助来报名体验实验班的新手快速入门java，更好的学习java！

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