簡單的java計算器
1. java簡單計算器
import java.util.Scanner;
public class Calculator {
@SuppressWarnings("resource")
public static void main(String[] args) {
System.out.println("+------------------+");
System.out.println("| JAVA計算器例子 |");
System.out.println("+------------------+");
System.out.println("規則：操作數必須為整數，若除法運算則除數不能為零，");
System.out.println("運算符必須為'+，-，*，%'中的一種");
while (true) {
System.out.println("+-------------------------------------------+");
System.out.println("| + 選 1，- 選 2，* 選 3，/ 選 4，退出 選 0 |");
System.out.println("+-------------------------------------------+");
System.out.println("請輸入您的選擇：");
Scanner scanner = new Scanner(System.in);
String input = scanner.nextLine();
if ("0".equals(input)) {
System.exit(0);
break;
} else {
calculation(input);
}
}
}
@SuppressWarnings("resource")
private static void calculation(String param) {
System.out.println("請輸入第一個數字：");
Scanner scanner1 = new Scanner(System.in);
int num1 = scanner1.nextInt();
System.out.println("請輸入第二個數字(如果是除法，不能輸入0)：");
Scanner scanner2 = new Scanner(System.in);
int num2 = scanner2.nextInt();
switch (param) {
case "1" :
System.out.println("本次的計算結果為：" + (num1 + num2));
break;
case "2" :
System.out.println("本次的計算結果為：" + (num1 - num2));
break;
case "3" :
System.out.println("本次的計算結果為：" + (num1 * num2));
break;
case "4" :
if (num2 == 0) {
System.out.println("除數為零，計算失敗！！！");
} else {
System.out.println("本次的計算結果為：" + (num1 / num2));
}
break;
default :
System.out.println("輸入有誤，請重新輸入。");
break;
}
}
}
上面是我寫的代碼，麻煩您看一下是否能滿足要求。
下面是執行的結果：
+------------------+
| JAVA計算器例子 |
+------------------+
規則：操作數必須為整數，若除法運算則除數不能為零，
運算符必須為'+，-，*，%'中的一種
+-------------------------------------------+
| + 選 1，- 選 2，* 選 3，/ 選 4，退出 選 0 |
+-------------------------------------------+
請輸入您的選擇：
1
請輸入第一個數字：
3
請輸入第二個數字(如果是除法，不能輸入0)：
4
本次的計算結果為：7
+-------------------------------------------+
| + 選 1，- 選 2，* 選 3，/ 選 4，退出 選 0 |
+-------------------------------------------+
請輸入您的選擇：
5
請輸入第一個數字：
0
請輸入第二個數字(如果是除法，不能輸入0)：
6
輸入有誤，請重新輸入。
+-------------------------------------------+
| + 選 1，- 選 2，* 選 3，/ 選 4，退出 選 0 |
+-------------------------------------------+
請輸入您的選擇：
4
請輸入第一個數字：
6
請輸入第二個數字(如果是除法，不能輸入0)：
3
本次的計算結果為：2
+-------------------------------------------+
| + 選 1，- 選 2，* 選 3，/ 選 4，退出 選 0 |
+-------------------------------------------+
請輸入您的選擇：
2
請輸入第一個數字：
7
請輸入第二個數字(如果是除法，不能輸入0)：
2
本次的計算結果為：5
+-------------------------------------------+
| + 選 1，- 選 2，* 選 3，/ 選 4，退出 選 0 |
+-------------------------------------------+
請輸入您的選擇：
3
請輸入第一個數字：
7
請輸入第二個數字(如果是除法，不能輸入0)：
8
本次的計算結果為：56
+-------------------------------------------+
| + 選 1，- 選 2，* 選 3，/ 選 4，退出 選 0 |
+-------------------------------------------+
請輸入您的選擇：
0
2. 用JAVA編寫一個簡單的計算器，要求如下
太麻煩了 說個思路, 過去字元串後 先獲取+-*%的下標.然後然後分割,獲取到一個數組或list
然後循環獲取() 按照數學運算順序拼起來,
然後把公式拆分一步一步操作就得出結果啦
3. 用java實現一個簡單的計算器。
說實在的，你寫的這個計算器不怎麼樣。特別是布局。
我給你一個很簡單的吧。你自己學習一下。。
import java.awt.*;
import java.awt.event.*;
/**
*
* @author zzj
*
*/
public class Jisuanqi extends WindowAdapter {
Panel p1 = new Panel();
Panel p2 = new Panel();
Panel p3 = new Panel();
TextField txt;
private Button[] b = new Button[17];
private String ss[] = { "7", "8", "9", "+", "4", "5", "6", "-", "1", "2",
"3", "*", "清空", "0", "=", "/", "關閉" };
static double a;
static String s, str;//定義變數 創建對像
public static void main(String args[]) {
(new Jisuanqi()).frame();
}
public void frame() {
Frame fm = new Frame("簡單計算器");
for (int i = 0; i <= 16; i++) {
b[i] = new Button(ss[i]);
}
for (int i = 0; i <= 15; i++) {
p2.add(b[i]);
} //創建按鈕 並添加到P2
b[16].setBackground(Color.yellow);
txt = new TextField(15);
txt.setEditable(false);
for (int i = 0; i <= 16; i++) {
b[i].addActionListener(new buttonlistener());//添加監聽器
}
b[16].addActionListener(new close());
fm.addWindowListener(this);
fm.setBackground(Color.red);
p1.setLayout(new BorderLayout());
p1.add(txt, "North");
p2.setLayout(new GridLayout(4, 4));
p3.setLayout(new BorderLayout());
p3.add(b[16]);
fm.add(p1, "North");
fm.add(p2, "Center");
fm.add(p3, "South");
fm.pack();
fm.setVisible(true);//都是些窗中設置 添加相關組件和監聽器
}
public void windowClosing(WindowEvent e) {
System.exit(0);//退出系統
}
class buttonlistener implements ActionListener {//編寫監聽器事件 通過按鍵得出給果
public void actionPerformed(ActionEvent e) {
Button btn = (Button) e.getSource();
if (btn.getLabel() == "=") {
jisuan();
str = String.valueOf(a);
txt.setText(str);
s = "";
} else if (btn.getLabel() == "+") {
jisuan();
txt.setText("");
s = "+";
} else if (btn.getLabel() == "-") {
jisuan();
txt.setText("");
s = "-";
} else if (btn.getLabel() == "/") {
jisuan();
txt.setText("");
s = "/";
} else if (btn.getLabel() == "*") {
jisuan();
txt.setText("");
s = "*";
} else {
txt.setText(txt.getText() + btn.getLabel());
if (btn.getLabel() == "清空")
txt.setText("");
}
}
public void jisuan() {//編寫具體計算方法
if (s == "+")
a += Double.parseDouble(txt.getText());
else if (s == "-")
a -= Double.parseDouble(txt.getText());
else if (s == "*")
a *= Double.parseDouble(txt.getText());
else if (s == "/")
a /= Double.parseDouble(txt.getText());
else
a = Double.parseDouble(txt.getText());
}
}
}
class close implements ActionListener {//退出
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
4. 你好，怎樣簡單的用JAVA製作計算器
網上有很多代碼啊，你可以很容易就搜到的。
5. 用Java設計一個簡單的計算器。
無聊寫了個，修復了下Bug：
importjava.awt.event.ActionEvent;
importjava.awt.event.ActionListener;
importjavax.swing.JButton;
importjavax.swing.JFrame;
importjavax.swing.JLabel;
importjavax.swing.JOptionPane;
importjavax.swing.JTextField;
{
=1L;
privateJButtonplus,rece,multiply,divice,reset;
privateJTextFieldone,two,result;
privatebooleandevice_falg=false;
privatefinalintwidth=400,height=300;
publicCalculate(){
super("修改密碼");
this.setLayout(null);
this.setSize(width,height);
init();
Layout();
}
publicvoidinit(){
plus=newJButton("加");
rece=newJButton("減");
multiply=newJButton("乘");
divice=newJButton("除");
reset=newJButton("清空");
one=newJTextField();
two=newJTextField();
result=newJTextField();
}
publicvoidLayout(){
this.add(newJLabel("第一個數")).setBounds(20,10,60,80);
this.add(one).setBounds(100,38,100,25);
this.add(newJLabel("第二個數")).setBounds(20,40,60,80);
this.add(two).setBounds(100,70,100,25);
this.add(newJLabel("結果")).setBounds(20,85,60,80);
this.add(result).setBounds(100,110,100,25);
this.add(plus).setBounds(70,170,80,25);
this.add(rece).setBounds(200,170,80,25);
this.add(multiply).setBounds(70,200,80,25);
this.add(divice).setBounds(200,200,80,25);
this.add(reset).setBounds(300,220,80,25);
plus.addActionListener(this);
rece.addActionListener(this);
multiply.addActionListener(this);
divice.addActionListener(this);
reset.addActionListener(this);
this.setVisible(true);
this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
publicbooleanFormat(){
booleanFLAG=false;
booleanflag=false;
Stringone=this.one.getText().toString().trim();
Stringtwo=this.two.getText().toString().trim();
if(one==null||one.equals("")||two==null||two.equals("")){
JOptionPane.showMessageDialog(getParent(),"請輸入完整信息!");
FLAG=false;
flag=true;
}
booleanboll_1=one.matches("[\d]{1,100}");
booleanboll_2=two.matches("[\d]{1,100}");
booleanboll_3=one.matches("[\d]{1,100}+[.]+[\d]{1,100}");
booleanboll_4=two.matches("[\d]{1,100}+[.]+[\d]{1,100}");
if(flag){
returnfalse;
}
if((boll_1&&boll_2)||(boll_3&&boll_4)||(boll_1&&boll_4)
||(boll_3&&boll_2)){
FLAG=true;
}else{
JOptionPane.showMessageDialog(getParent(),"請輸入數字!");
FLAG=false;
}
if(FLAG&&device_falg){
if(Double.parseDouble(two)==0){
JOptionPane.showMessageDialog(getParent(),"被除數不能為0!");
FLAG=false;
device_falg=false;
}
}
returnFLAG;
}
publicdoublePlus(doubleone,doubletwo){
returnone+two;
}
publicdoubleMultiply(doubleone,doubletwo){
returnone*two;
}
publicdoubleDivice(doubleone,doubletwo){
returnone/two;
}
publicdoubleRece(doubleone,doubletwo){
returnone-two;
}
publicvoidClear(){
one.setText("");
two.setText("");
result.setText("");
}
@Override
publicvoidactionPerformed(ActionEvente){
Objecto=e.getSource();
if(o==reset){
Clear();
return;
}
if(o==divice){
device_falg=true;
}
if(!Format()){
return;
}
doubleone=Double.parseDouble(this.one.getText());
doubletwo=Double.parseDouble(this.two.getText());
doubleresult=0;
if(o==plus){
result=Plus(one,two);
}elseif(o==rece){
result=Rece(one,two);
}elseif(o==multiply){
result=Multiply(one,two);
}elseif(o==divice){
result=Divice(one,two);
}
this.result.setText(""+result);
}
publicstaticvoidmain(String[]args){
newCalculate();
}
}
6. 用java編寫一個簡單計算器
/*
* @(#)JCalculator.java 1.00 06/17/2015
*/
importjava.awt.*;
importjava.awt.event.*;
importjavax.swing.*;
/**
* A simple calculator program.
*<p>I saw this program in a QQ group, and help a friend correct it.</p>
*
*@authorSingyuenYip
*@version1.00 12/29/2009
*@seeJFrame
*@seeActionListener
*/
{
/**
* Serial Version UID
*/
= -169068472193786457L;
/**
* This class help close the Window.
*@authorSingyuenYip
*
*/
{
publicvoidwindowClosing(WindowEvent we) {
System.exit(0);
}
}
inti;
// Strings for Digit & Operator buttons.
privatefinalString[]str= {"7","8","9","/","4","5","6","*","1",
"2","3","-",".","0","=","+"};
// Build buttons.
JButton[]buttons=newJButton[str.length];
// For cancel or reset.
JButtonreset=newJButton("CE");
// Build the text field to show the result.
JTextFielddisplay=newJTextField("0");
/**
* Constructor without parameters.
*/
publicJCalculator() {
super("Calculator");
// Add a panel.
JPanel panel1 =newJPanel(newGridLayout(4, 4));
// panel1.setLayout(new GridLayout(4,4));
for(i= 0;i<str.length;i++) {
buttons[i] =newJButton(str[i]);
panel1.add(buttons[i]);
}
JPanel panel2 =newJPanel(newBorderLayout());
// panel2.setLayout(new BorderLayout());
panel2.add("Center",display);
panel2.add("East",reset);
// JPanel panel3 = new Panel();
getContentPane().setLayout(newBorderLayout());
getContentPane().add("North", panel2);
getContentPane().add("Center", panel1);
// Add action listener for each digit & operator button.
for(i= 0;i<str.length;i++)
buttons[i].addActionListener(this);
// Add listener for "reset" button.
reset.addActionListener(this);
// Add listener for "display" button.
display.addActionListener(this);
// The "close" button "X".
addWindowListener(newWindowCloser());
// Initialize the window size.
setSize(800, 800);
// Show the window.
// show(); Using show() while JDK version is below 1.5.
setVisible(true);
// Fit the certain size.
pack();
}
publicvoidactionPerformed(ActionEvent e) {
Object target = e.getSource();
String label = e.getActionCommand();
if(target ==reset)
handleReset();
elseif("0123456789.".indexOf(label) > 0)
handleNumber(label);
else
handleOperator(label);
}
// Is the first digit pressed?
booleanisFirstDigit=true;
/**
* Number handling.
*@paramkey the key of the button.
*/
publicvoidhandleNumber(String key) {
if(isFirstDigit)
display.setText(key);
elseif((key.equals(".")) && (display.getText().indexOf(".") < 0))
display.setText(display.getText() +".");
elseif(!key.equals("."))
display.setText(display.getText() + key);
isFirstDigit=false;
}
/**
* Reset the calculator.
*/
publicvoidhandleReset() {
display.setText("0");
isFirstDigit=true;
operator="=";
}
doublenumber= 0.0;
Stringoperator="=";
/**
* Handling the operation.
*@paramkey pressed operator's key.
*/
publicvoidhandleOperator(String key) {
if(operator.equals("+"))
number+= Double.valueOf(display.getText());
elseif(operator.equals("-"))
number-= Double.valueOf(display.getText());
elseif(operator.equals("*"))
number*= Double.valueOf(display.getText());
elseif(operator.equals("/"))
number/= Double.valueOf(display.getText());
elseif(operator.equals("="))
number= Double.valueOf(display.getText());
display.setText(String.valueOf(number));
operator= key;
isFirstDigit=true;
}
publicstaticvoidmain(String[] args) {
newJCalculator();
}
}
運行界面：
7. 用Java做一個簡單的計算器
窗體
package Calc;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
*
* 計算器程序
*
*/
public class CalcFrame extends JFrame {
JButton[] buttons = new JButton[16];// 16個按鈕
StringBuffer sb = null;//
JTextField text1 = null;// 計算器結果顯示框
String no1 = null;
String sign = null;// 表示+-*/符號
String[] s = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "+", "-",
"*", "/", "=", "C" };// 面板上的字元
public CalcFrame() {
setTitle("計算器");
setResizable(false);
setBounds(200, 200, 300, 350);
setLayout(null);
sb = new StringBuffer();
text1 = new JTextField();
text1.setBounds(10, 10, 250, 30);// 設置位置
text1.setFont(new Font("Arial", Font.PLAIN, 20));// 設置字體
text1.setForeground(Color.RED);// 設置顏色
add(text1);
for (int i = 0; i < s.length; i++) {
buttons[i] = new JButton(s[i]);
buttons[i].setFont(new Font("Serif", Font.BOLD, 18));
add(buttons[i]);
}// 生成面板上的按鈕.
buttons[0].setBounds(10, 50, 50, 40);
buttons[0].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(0);
text1.setText(sb.toString());
}
});
buttons[1].setBounds(70, 50, 50, 40);
buttons[1].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(1);
text1.setText(sb.toString());
}
});
buttons[2].setBounds(130, 50, 50, 40);
buttons[2].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(2);
text1.setText(sb.toString());
}
});
buttons[3].setBounds(190, 50, 50, 40);
buttons[3].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(3);
text1.setText(sb.toString());
}
});
buttons[4].setBounds(10, 100, 50, 40);
buttons[4].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(4);
text1.setText(sb.toString());
}
});
buttons[5].setBounds(70, 100, 50, 40);
buttons[5].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(5);
text1.setText(sb.toString());
}
});
buttons[6].setBounds(130, 100, 50, 40);
buttons[6].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(6);
text1.setText(sb.toString());
}
});
buttons[7].setBounds(190, 100, 50, 40);
buttons[7].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(7);
text1.setText(sb.toString());
}
});
buttons[8].setBounds(10, 150, 50, 40);
buttons[8].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(8);
text1.setText(sb.toString());
}
});
buttons[9].setBounds(70, 150, 50, 40);
buttons[9].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.append(9);
text1.setText(sb.toString());
}
});
buttons[10].setBounds(130, 150, 50, 40);
buttons[10].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sign = "+";
no1 = text1.getText();
sb.delete(0, sb.capacity());
}
});
buttons[11].setBounds(190, 150, 50, 40);
buttons[11].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sign = "-";
no1 = text1.getText();
sb.delete(0, sb.capacity());
}
});
buttons[12].setBounds(10, 200, 50, 40);
buttons[12].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sign = "*";
no1 = text1.getText();
sb.delete(0, sb.capacity());
}
});
buttons[13].setBounds(70, 200, 50, 40);
buttons[13].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sign = "/";
no1 = text1.getText();
sb.delete(0, sb.capacity());
}
});
buttons[14].setForeground(Color.RED);
buttons[14].setBounds(130, 200, 50, 40);
buttons[14].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int sum = 0;//最終結果
if (sign.equals("+")) {
int no2 = Integer.parseInt(no1);//取得前一個數
int no3 = Integer.parseInt(text1.getText());//取得現在的數
sum = no2 + no3;//累加
text1.setText(String.valueOf(sum));
}
if (sign.equals("-")) {
int no2 = Integer.parseInt(no1);
int no3 = Integer.parseInt(text1.getText());
sum = no2 - no3;
text1.setText(String.valueOf(sum));
}
if (sign.equals("*")) {
int no2 = Integer.parseInt(no1);
int no3 = Integer.parseInt(text1.getText());
sum = no2 * no3;
text1.setText(String.valueOf(sum));
}
if (sign.equals("/")) {
int no2 = Integer.parseInt(no1);
int no3 = Integer.parseInt(text1.getText());
sum = no2 / no3;
text1.setText(String.valueOf(sum));
}
}
});
buttons[15].setBounds(190, 200, 50, 40);
buttons[15].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
sb.delete(0, sb.capacity());//清除sb的內容
text1.setText("");//結果框設置為空
}
});
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//響應關閉窗口
setVisible(true);//顯示窗口
}
}
2.主程序類
package Calc;
public class CalcTest {
public static void main(String[] args) {
CalcFrame f = new CalcFrame();
}
}
學習Java就到IT學習聯盟
8. 怎麼用java做個簡單的計算器
package com.gjq.test;
import java.util.Scanner;
public class xte {
/**
* @param args
*/
public static void main(String[] args) {
System.out.println("****************計算器****************");
System.out.print("請輸入數字①：");
Scanner scanner1 = new Scanner(System.in);
double num1= scanner1.nextDouble();
System.out.print("請輸入運算符,如：+ - * /：");
Scanner scanner2 = new Scanner(System.in);
String zifu= scanner2.next();
System.out.print("請輸入數字②：");
Scanner scanner3 = new Scanner(System.in);
double num3= scanner3.nextDouble();
char charzf =zifu.toCharArray()[0];
switch (charzf) {
case '+':
System.out.println("結果為："+num1+" "+charzf+" "+num3+" = "+(num1+num3));
break;
case '-':
System.out.println("結果為："+num1+" "+charzf+" "+num3+" = "+(num1-num3));
break;
case '*':
System.out.println("結果為："+num1+" "+charzf+" "+num3+" = "+(num1*num3));
break;
case '/':
if(num3!=0){
System.out.println("結果為："+num1+" "+charzf+" "+num3+" = "+(num1/num3));
}
break;
default:
System.out.println("輸入錯誤！");
break;
}
}
}