java無參計算器代碼 java科學計算器代碼

求用JAVA實現(xiàn)計算器的代碼（可實用的，沒語法錯誤的）

import java.awt.BorderLayout; import java.awt.Color; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.border.TitledBorder; //導(dǎo)包 public class Jisuanqi extends JFrame implements ActionListener { //繼承JFrame 實現(xiàn)事件監(jiān)聽 private JTextField reasult; private JButton btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8, btn9, btn0, btnAC, btnAdd, btnSub, btnReasult, btnD, btnAbout, btnCancel; private boolean add, sub, end, s, c; private String str; private double num1, num2; public Jisuanqi() { //構(gòu)造屬性 JPanel p1 = new JPanel(); JPanel p2 = new JPanel(); JPanel p3 = new JPanel(); TitledBorder tb = new TitledBorder("輸出"); tb.setTitleColor(Color.BLUE); //標題邊框底端線設(shè)置顏色 btnAbout = new JButton(" 關(guān)于 "); btnCancel = new JButton("Cancel"); //兩個按鈕 btnCancel.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ee) { System.exit(0); } }); //給Cancel添加事件監(jiān)聽當鼠標點擊時程序結(jié)束 btnAbout.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ee) { JOptionPane.showMessageDialog(null, "黃蓋！！", "消息", JOptionPane.INFORMATION_MESSAGE); } //給“關(guān)于”添加事件監(jiān)聽當鼠標點擊時彈出對話框顯示黃蓋 }); p3.add(btnAbout); p3.add(btnCancel); // JPanel p4=new JPanel(); // JPanel p5=new JPanel(); // reasult.setBorder(tb); reasult = new JTextField("0", 20); reasult.setEditable(false); //設(shè)置不能修改 reasult.setHorizontalAlignment(JTextField.RIGHT); // 設(shè)置文本的水平對齊方式。 reasult.setForeground(Color.BLUE); //顏色 p1.setBorder(tb); p1.add(reasult); btn0 = new JButton("0"); btn0.addActionListener(this); btn1 = new JButton("1"); btn1.addActionListener(this); btn2 = new JButton("2"); btn2.addActionListener(this); btn3 = new JButton("3"); btn3.addActionListener(this); btn4 = new JButton("4"); btn4.addActionListener(this); btn5 = new JButton("5"); btn5.addActionListener(this); btn6 = new JButton("6"); btn6.addActionListener(this); btn7 = new JButton("7"); btn7.addActionListener(this); btn8 = new JButton("8"); btn8.addActionListener(this); btn9 = new JButton("9"); btn9.addActionListener(this); btnD = new JButton("."); btnD.addActionListener(this); btnD.setForeground(Color.RED); btnAC = new JButton("AC"); btnAC.addActionListener(this); btnAC.setBackground(Color.PINK); btnAdd = new JButton("+"); btnAdd.addActionListener(this); btnAdd.setForeground(Color.BLUE); btnSub = new JButton("—"); btnSub.addActionListener(this); btnSub.setForeground(Color.BLUE); btnReasult = new JButton("="); btnReasult.addActionListener(this); btnReasult.setForeground(Color.RED); //事件監(jiān)聽 + 顏色 p2.add(btn1); p2.add(btn2); p2.add(btn3); p2.add(btn4); p2.add(btn5); p2.add(btn6); p2.add(btn7); p2.add(btn8); p2.add(btn9); p2.add(btn0); p2.add(btnD); p2.add(btnAC); p2.add(btnAdd); p2.add(btnSub); p2.add(btnReasult); //面板上添加按鈕 p2.setLayout(new GridLayout(5, 3)); //面板上設(shè)置對齊方式 add(p1, BorderLayout.NORTH); add(p2, BorderLayout.CENTER); add(p3, BorderLayout.SOUTH); //將p1 p2 p3 面板對象添加到JFrame } public void num(int i) { String s = null; s = String.valueOf(i); if (end) { // 如果數(shù)字輸入結(jié)束，則將文本框置零，重新輸入 reasult.setText("0"); end = false; } if ((reasult.getText()).equals("0")) { // 如果文本框的內(nèi)容為零，則覆蓋文本框的內(nèi)容 reasult.setText(s); } else { // 如果文本框的內(nèi)容不為零，則在內(nèi)容后面添加數(shù)字 str = reasult.getText() + s; reasult.setText(str); } }/* * * String s=null; * * s=String.valueOf(i); * * str=reasult.getText()+s; * * reasult.setText(str); * * } */ public void actionPerformed(ActionEvent e) { if (e.getSource() == btn1) num(1); else if (e.getSource() == btn2) num(2); else if (e.getSource() == btn3) num(3); else if (e.getSource() == btn4) num(4); else if (e.getSource() == btn5) num(5); else if (e.getSource() == btn6) num(6); else if (e.getSource() == btn7) num(7); else if (e.getSource() == btn8) num(8); else if (e.getSource() == btn9) num(9); else if (e.getSource() == btn0) num(0); else if (e.getSource() == btnAdd) { sign(1); btnD.setEnabled(true); } else if (e.getSource() == btnSub) { sign(2); btnD.setEnabled(true); } else if (e.getSource() == btnAC) { btnD.setEnabled(true); reasult.setText("0"); } else if (e.getSource() == btnD) { str = reasult.getText(); str += "."; reasult.setText(str); btnD.setEnabled(false); } else if (e.getSource() == btnReasult) { btnD.setEnabled(true); num2 = Double.parseDouble(reasult.getText()); if (add) { num1 = num1 + num2; } else if (sub) { num1 = num1 - num2; } reasult.setText(String.valueOf(num1)); end = true; } } public void sign(int s) { if (s == 1) { add = true; sub = false; } else if (s == 2) { add = false; sub = true; } num1 = Double.parseDouble(reasult.getText()); end = true; } //設(shè)計計算的過程 public static void main(String[] args) { Jisuanqi j = new Jisuanqi(); j.setTitle("+/-簡易計算器"); j.setLocation(500, 280); j.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //默認關(guān)閉可以關(guān)閉程序 j.setResizable(false); j.pack(); j.setVisible(true); } } 這個計算機，絕對讓你滿意

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java 計算器代碼

import java.util.Scanner;

public class JiSuan {

public static void main(String[] args) {

String zhanghao="765800331";//注意賬號密碼均為字符串類型

String mima="123456";

int isgoing=0;//當賬號或密碼輸入錯誤時提示是否繼續(xù)輸入

String select="";//六種運算中你的選擇

int result=0;//運算結(jié)果

int a=0;

int b=0;

Scanner sa = new Scanner(System.in);

do{

System.out.println("請輸入你的賬號：");

String zhanghao1= sa.next();

System.out.println("請輸入你的密碼：");

String mima1= sa.next();

if(zhanghao.equals(zhanghao1)mima.equals(mima1)){

while(zhanghao.equals(zhanghao1)mima.equals(mima1)){

System.out.println("*******************歡迎使用Java小計算器**************");

System.out.println("本計算器提供以下功能");

System.out.println("A.加法");

System.out.println("B.減法");

System.out.println("C.乘法");

System.out.println("D.除法");

System.out.println("E.a的b次冪");

System.out.println("F.退出計算器");

System.out.println("請選擇：");

select= sa.next();

char c=select.charAt(0);//申明一個變量c來接收select轉(zhuǎn)換成char類型的變量

switch(c){

case 'A':

System.out.println("請輸入第一個數(shù)");

a = sa.nextInt();

System.out.println("請輸入第二個數(shù)");

b = sa.nextInt();

result = a+b;

System.out.println("運算結(jié)果如下："+result);

break;

case 'B':

System.out.println("請輸入第一個數(shù)");

a = sa.nextInt();

System.out.println("請輸入第二個數(shù)");

b = sa.nextInt();

result = a-b;

System.out.println("運算結(jié)果如下："+result);

break;

case 'C':

System.out.println("請輸入第一個數(shù)");

a = sa.nextInt();

System.out.println("請輸入第二個數(shù)");

b = sa.nextInt();

result = a*b;

System.out.println("運算結(jié)果如下："+result);

break;

case 'D':

System.out.println("請輸入第一個數(shù)");

a = sa.nextInt();

System.out.println("請輸入第二個數(shù)");

b = sa.nextInt();

result = a/b;

if(a%b!=0){

int m=a%b;

System.out.println("運算結(jié)果如下："+result+" 余數(shù)："+m);

}else{

System.out.println("運算結(jié)果如下："+result);

}

break;

case 'E':

System.out.println("請輸入第一個數(shù)");

a = sa.nextInt();

System.out.println("請輸入第二個數(shù)");

b = sa.nextInt();

int i=0;//指數(shù)的底數(shù)

int sum=1;//用來接收a的b次冪的結(jié)果

for(i=0;ib;i++){

sum=sum*a;

result=sum;

}

System.out.println("運算結(jié)果如下："+result);

break;

case 'F':

System.out.println("退出計算器");

break;

default:

System.out.println("無效輸入");

break;

}

if(c=='F'){

break;

}

}else{

System.out.println("賬號或密碼輸入錯誤！");

System.out.println("是否繼續(xù)輸入？（1.是0.否）");

isgoing = sa.nextInt();

}

}while(isgoing==1);

}

誰能給一個Java的計算器程序代碼（加注釋）

以前寫的，給你了

import java.awt.BorderLayout;

import java.awt.GridLayout;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.text.DecimalFormat;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

public class Calculator {

//計算器面板

private JFrame f = new JFrame("Calculator");

//輸入面扳

private JPanel inputPanel = new JPanel();

//加減乘除面板

private JPanel operationPanel = new JPanel();

//數(shù)字面板

private JPanel buttonsPanel = new JPanel();

//輸入數(shù)據(jù)文本框

private JTextField input = new JTextField(20);

//退格鍵

private JButton backspace = new JButton("BackSpace");

//清空

private JButton CE = new JButton("CE ");

//刪除

private JButton C = new JButton("C ");

//四則運算符號鍵

private JButton add = new JButton("+");

private JButton sub = new JButton("-");

private JButton mul = new JButton("*");

private JButton div = new JButton("/");

//小數(shù)點

private JButton decimal = new JButton(".");

//等號

private JButton equal = new JButton("=");

//數(shù)字鍵

private JButton zero = new JButton("0");

private JButton one = new JButton("1");

private JButton two = new JButton("2");

private JButton three = new JButton("3");

private JButton four = new JButton("4");

private JButton five = new JButton("5");

private JButton six = new JButton("6");

private JButton seven = new JButton("7");

private JButton eight = new JButton("8");

private JButton nine = new JButton("9");

private String num1 = "";//保存第一個運算數(shù)字

private String operator = "";//保存運算符號

public static void main(String[] args) {

new Calculator();//new計算器實例

}

public Calculator(){

//添加組件，布局

inputPanel.add(input);

f.add(inputPanel, BorderLayout.NORTH);

operationPanel.add(backspace);

operationPanel.add(CE);

operationPanel.add(C);

f.add(operationPanel, BorderLayout.CENTER);

buttonsPanel.add(add);

buttonsPanel.add(sub);

buttonsPanel.add(mul);

buttonsPanel.add(div);

buttonsPanel.add(one);

buttonsPanel.add(two);

buttonsPanel.add(three);

buttonsPanel.add(zero);

buttonsPanel.add(four);

buttonsPanel.add(five);

buttonsPanel.add(six);

buttonsPanel.add(decimal);

buttonsPanel.add(seven);

buttonsPanel.add(eight);

buttonsPanel.add(nine);

buttonsPanel.add(equal);

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

f.add(buttonsPanel, BorderLayout.SOUTH);

//注冊各個組件監(jiān)聽事件

backspace.addMouseListener(new OperationMouseListener());

CE.addMouseListener(new OperationMouseListener());

C.addMouseListener(new OperationMouseListener());

decimal.addMouseListener(new OperationMouseListener());

equal.addMouseListener(new OperationMouseListener());

//注冊四則運算監(jiān)聽

add.addMouseListener(new CalcMouseListener());

sub.addMouseListener(new CalcMouseListener());

mul.addMouseListener(new CalcMouseListener());

div.addMouseListener(new CalcMouseListener());

//注冊數(shù)字監(jiān)聽事件

zero.addMouseListener(new NumberMouseListener());

one.addMouseListener(new NumberMouseListener());

two.addMouseListener(new NumberMouseListener());

three.addMouseListener(new NumberMouseListener());

four.addMouseListener(new NumberMouseListener());

five.addMouseListener(new NumberMouseListener());

six.addMouseListener(new NumberMouseListener());

seven.addMouseListener(new NumberMouseListener());

eight.addMouseListener(new NumberMouseListener());

nine.addMouseListener(new NumberMouseListener());

f.setVisible(true);

f.pack();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

private class NumberMouseListener implements MouseListener{

public void mouseClicked(MouseEvent e) {

if(input.getText().trim().equals("0")){//如果文本框已經(jīng)是0，結(jié)果還是0

input.setText(((JButton)e.getSource()).getText().trim());

}else{//否則的話，把0添加到后面，譬如文本框是1，結(jié)果就為10

input.setText(input.getText().concat(((JButton)e.getSource()).getText().trim()));

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {}

public void mouseReleased(MouseEvent e) {}

}

private class CalcMouseListener implements MouseListener{

//如果輸入的是運算符號，保存第一個結(jié)果和運算符號

public void mouseClicked(MouseEvent e) {

num1 = input.getText().trim();input.setText("");

operator = ((JButton)e.getSource()).getText().trim();

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {}

public void mouseReleased(MouseEvent e) {}

}

private class OperationMouseListener implements MouseListener{

public void mouseClicked(MouseEvent e) {

if(e.getSource() == backspace){//退格鍵，刪除一個直到?jīng)]有字符刪除

String inputText = input.getText();

if(inputText.length() 0){

input.setText(inputText.substring(0, inputText.length() - 1));

}

}else if(e.getSource() == C){

input.setText("0");//C，清空所有運算數(shù)字和符號

num1 = "";

}else if(e.getSource() == CE){

input.setText("0");//CE--將文本框置為0

}else if(e.getSource() == decimal){

String text = input.getText().trim();

//如果按了小數(shù)點，如果文本框已經(jīng)有小數(shù)點，不做任何操作，否則在結(jié)果后面加上小數(shù)點

if(text.indexOf(".") == -1){

input.setText(text.concat("."));

}

}else if(e.getSource() == equal){

//如果是等號

if(!operator.trim().equals("")){

if(!input.getText().trim().equals("")){

double result = 0D;

if(operator.equals("+")){//執(zhí)行加法運算

result = Double.parseDouble(num1) + Double.parseDouble(input.getText().trim());

}else if(operator.equals("-")){//減法運算

result = Double.parseDouble(num1) - Double.parseDouble(input.getText().trim());

}else if(operator.equals("*")){//乘法運算

result = Double.parseDouble(num1) * Double.parseDouble(input.getText().trim());

}else if(operator.equals("/")){//除法運算

result = Double.parseDouble(num1) / Double.parseDouble(input.getText().trim());

}

//格式化最終結(jié)果，保留兩位小數(shù)點

input.setText(new DecimalFormat("0.00").format(result));

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {}

public void mouseReleased(MouseEvent e) {}

}

Java計算器源代碼

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.*;public class CaculatorA {

private JFrame jf;

private JButton[] jbs;

private JTextField jtf;

private JButton clear;

private double num1,num2,jieguo;

private char c;

/**

* 構(gòu)造方法實例化屬性

public CaculatorA(){

jf=new JFrame("我的計算器v1.0");

jtf=new JTextField(20);

clear=new JButton("clear");

jbs=new JButton[16];

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

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

jbs[i]=new JButton(str.charAt(i)+"");

}

init();

addEventHandler();

// setFont();

// setColor();

showMe();

}

/**

java計算器代碼

這段代碼對你有幫助

import javax.swing.*;

import javax.swing.border.Border;

import java.awt.*;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import java.math.BigDecimal;

import java.math.RoundingMode;

import java.util.HashMap;

/**

* 我的計算器。MyCalculator 繼承于 JFrame，是計算器的界面

public class MyCalculator extends JFrame {

private Border border = BorderFactory.createEmptyBorder(5, 5, 5, 5);

private JTextField textbox = new JTextField("0");

private CalculatorCore core = new CalculatorCore();

private ActionListener listener = new ActionListener() {

public void actionPerformed(ActionEvent e) {

JButton b = (JButton) e.getSource();

String label = b.getText();

String result = core.process(label);

textbox.setText(result);

}

};

public MyCalculator(String title) throws HeadlessException {

super(title); // 調(diào)用父類構(gòu)造方法

setupFrame(); // 調(diào)整窗體屬性

setupControls(); // 創(chuàng)建控件

}

private void setupControls() {

setupDisplayPanel(); // 創(chuàng)建文本面板

setupButtonsPanel(); // 創(chuàng)建按鈕面板

}

// 創(chuàng)建按鈕面板并添加按鈕

private void setupButtonsPanel() {

JPanel panel = new JPanel();

panel.setBorder(border);

panel.setLayout(new GridLayout(4, 5, 3, 3));

createButtons(panel, new String[]{

"7", "8", "9", "+", "C",

"4", "5", "6", "-", "CE",

"1", "2", "3", "*", "", // 空字符串表示這個位置沒有按鈕

"0", ".", "=", "/", ""

});

this.add(panel, BorderLayout.CENTER);

}

/**

* 在指定的面板上創(chuàng)建按鈕

* @param panel 要創(chuàng)建按鈕的面板

* @param labels 按鈕文字

private void createButtons(JPanel panel, String[] labels) {

for (String label : labels) {

// 如果 label 為空，則表示創(chuàng)建一個空面板。否則創(chuàng)建一個按鈕。

if (label.equals("")) {

panel.add(new JPanel());

} else {

JButton b = new JButton(label);

b.addActionListener(listener); // 為按鈕添加偵聽器

panel.add(b);

}

// 設(shè)置顯示面板，用一個文本框來作為計算器的顯示部分。

private void setupDisplayPanel() {

JPanel panel = new JPanel();

panel.setLayout(new BorderLayout());

panel.setBorder(border);

setupTextbox();

panel.add(textbox, BorderLayout.CENTER);

this.add(panel, BorderLayout.NORTH);

}

// 調(diào)整文本框

private void setupTextbox() {

textbox.setHorizontalAlignment(JTextField.RIGHT); // 文本右對齊

textbox.setEditable(false); // 文本框只讀

textbox.setBackground(Color.white); // 文本框背景色為白色

}

// 調(diào)整窗體

private void setupFrame() {

this.setDefaultCloseOperation(EXIT_ON_CLOSE); // 當窗體關(guān)閉時程序結(jié)束

this.setLocation(100, 50); // 設(shè)置窗體顯示在桌面上的位置

this.setSize(300, 200); // 設(shè)置窗體大小

this.setResizable(false); // 窗體大小固定

}

// 程序入口

public static void main(String[] args) throws Exception {

UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

MyCalculator frame = new MyCalculator("我的計算器");

frame.setVisible(true); // 在桌面上顯示窗體

}

/**

* 計算器核心邏輯。這個邏輯只能處理 1~2 個數(shù)的運算。

class CalculatorCore {

private String displayText = "0"; // 要顯示的文本

boolean reset = true;

private BigDecimal number1, number2;

private String operator;

private HashMapString, Operator operators = new HashMapString, Operator();

private HashMapString, Processor processors = new HashMapString, Processor();

CalculatorCore() {

setupOperators();

setupProcessors();

}

// 為每種命令添加處理方式

private void setupProcessors() {

processors.put("[0-9]", new Processor() {