编写java程序简单计算器

主要涉及的知识点: 类的写法, 以及方法的调用 .建议多做练习. 如果有看不懂的地方. 可以继续追问,一起讨论.

叙永网站建设公司成都创新互联公司,叙永网站设计制作，有大型网站制作公司丰富经验。已为叙永数千家提供企业网站建设服务。企业网站搭建\成都外贸网站制作要多少钱，请找那个售后服务好的叙永做网站的公司定做！

参考代码如下

//Number类

class Number {

private int n1;//私有的整型数据成员n1

private int n2;//私有的整型数据成员n2

// 通过构造函数给n1和n2赋值

public Number(int n1, int n2) {

this.n1 = n1;

this.n2 = n2;

}

// 加法

public int addition() {

return n1 + n2;

}

// 减法

public int subtration() {

return n1 - n2;

}

// 乘法

public int multiplication() {

return n1 * n2;

}

// 除法 (可能除不尽,所以使用double作为返回类型)

public double division() {

return n1 * 1.0 / n2; // 通过n1*1.0 把计算结果转换成double类型.

}

}

//Exam4 类

public class Exam4{

public static void main(String[] args) {

Number number=new Number(15, 6);//创建Number类的对象

//下面的是调用方法得到返回值进行输出显示

System.out.println("加法"+number.addition());

System.out.println("减法"+number.subtration());

System.out.println("乘法"+number.multiplication());

System.out.println("除法"+number.division());

}

}

求JAVA简易计算器代码。

import javax.swing.SwingUtilities;

import javax.swing.JPanel;

import javax.swing.JFrame;

import javax.swing.JTextField;

import java.awt.Rectangle;

import javax.swing.JButton;

public class Calculator extends JFrame {

private static final long serialVersionUID = 1L;

private JPanel jContentPane = null;

private JTextField jTextField = null;

private JButton jButton = null;

private JButton jButton1 = null;

private JButton jButton2 = null;

private JButton jButton3 = null;

private JButton jButton4 = null;

private JButton jButton5 = null;

private JButton jButton6 = null;

private JButton jButton7 = null;

private JButton jButton8 = null;

private JButton jButton9 = null;

private JButton jButton10 = null;

private JButton jButton11 = null;

private JButton jButton12 = null;

private JButton jButton13 = null;

private JButton jButton14 = null;

private double first = 0;

private double second = 0;

private JButton jButton15 = null;

private JButton jButton16 = null;

private String way = "";

private double result = 0;

private char[] ch = new char[12];

private int i = 0;

/**

* This method initializes jTextField

*

* @return javax.swing.JTextField

*/

private JTextField getJTextField() {

if (jTextField == null) {

jTextField = new JTextField("0");

jTextField.setBounds(new Rectangle(60, 15, 234, 31));

jTextField.setHorizontalAlignment(JTextField.RIGHT);

}

return jTextField;

}

/**

* This method initializes jButton

*

* @return javax.swing.JButton

*/

private JButton getJButton() {

if (jButton == null) {

jButton = new JButton();

jButton.setBounds(new Rectangle(62, 74, 44, 37));

jButton.setText("1");

jButton.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '1';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton;

}

/**

* This method initializes jButton1

*

* @return javax.swing.JButton

*/

private JButton getJButton1() {

if (jButton1 == null) {

jButton1 = new JButton();

jButton1.setBounds(new Rectangle(119, 74, 44, 37));

jButton1.setText("2");

jButton1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '2';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton1;

}

/**

* This method initializes jButton2

*

* @return javax.swing.JButton

*/

private JButton getJButton2() {

if (jButton2 == null) {

jButton2 = new JButton();

jButton2.setBounds(new Rectangle(176, 74, 44, 37));

jButton2.setText("3");

jButton2.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '3';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton2;

}

/**

* This method initializes jButton3

*

* @return javax.swing.JButton

*/

private JButton getJButton3() {

if (jButton3 == null) {

jButton3 = new JButton();

jButton3.setBounds(new Rectangle(62, 129, 44, 37));

jButton3.setText("4");

jButton3.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '4';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton3;

}

/**

* This method initializes jButton4

*

* @return javax.swing.JButton

*/

private JButton getJButton4() {

if (jButton4 == null) {

jButton4 = new JButton();

jButton4.setBounds(new Rectangle(119, 129, 44, 37));

jButton4.setText("5");

jButton4.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '5';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton4;

}

/**

* This method initializes jButton5

*

* @return javax.swing.JButton

*/

private JButton getJButton5() {

if (jButton5 == null) {

jButton5 = new JButton();

jButton5.setBounds(new Rectangle(176, 129, 44, 37));

jButton5.setText("6");

jButton5.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '6';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton5;

}

/**

* This method initializes jButton6

*

* @return javax.swing.JButton

*/

private JButton getJButton6() {

if (jButton6 == null) {

jButton6 = new JButton();

jButton6.setBounds(new Rectangle(62, 184, 44, 37));

jButton6.setText("7");

jButton6.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '7';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton6;

}

/**

* This method initializes jButton7

*

* @return javax.swing.JButton

*/

private JButton getJButton7() {

if (jButton7 == null) {

jButton7 = new JButton();

jButton7.setBounds(new Rectangle(119, 184, 44, 37));

jButton7.setText("8");

jButton7.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '8';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton7;

}

/**

* This method initializes jButton8

*

* @return javax.swing.JButton

*/

private JButton getJButton8() {

if (jButton8 == null) {

jButton8 = new JButton();

jButton8.setBounds(new Rectangle(176, 184, 44, 37));

jButton8.setText("9");

jButton8.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '9';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton8;

}

/**

* This method initializes jButton9

*

* @return javax.swing.JButton

*/

private JButton getJButton9() {

if (jButton9 == null) {

jButton9 = new JButton();

jButton9.setBounds(new Rectangle(233, 74, 44, 37));

jButton9.setText("+");

jButton9.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

first = Double.parseDouble(jTextField.getText());

way = "+";

ch = new char[12];

i = 0;

jButton16.setEnabled(true);

}

});

}

return jButton9;

}

/**

* This method initializes jButton10

*

* @return javax.swing.JButton

*/

private JButton getJButton10() {

if (jButton10 == null) {

jButton10 = new JButton();

jButton10.setBounds(new Rectangle(290, 74, 44, 37));

jButton10.setText("-");

jButton10.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

first = Double.parseDouble(jTextField.getText());

way = "-";

ch = new char[12];

i = 0;

jButton16.setEnabled(true);

}

});

}

return jButton10;

}

/**

* This method initializes jButton11

*

* @return javax.swing.JButton

*/

private JButton getJButton11() {

if (jButton11 == null) {

jButton11 = new JButton();

jButton11.setBounds(new Rectangle(233, 129, 44, 37));

jButton11.setText("*");

jButton11.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

first = Double.parseDouble(jTextField.getText());

way = "*";

ch = new char[12];

i = 0;

jButton16.setEnabled(true);

}

});

}

return jButton11;

}

/**

* This method initializes jButton12

*

* @return javax.swing.JButton

*/

private JButton getJButton12() {

if (jButton12 == null) {

jButton12 = new JButton();

jButton12.setBounds(new Rectangle(290, 129, 44, 37));

jButton12.setText("/");

jButton12.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

first = Double.parseDouble(jTextField.getText());

way = "/";

ch = new char[12];

i = 0;

jButton16.setEnabled(true);

}

});

}

return jButton12;

}

/**

* This method initializes jButton13

*

* @return javax.swing.JButton

*/

private JButton getJButton13() {

if (jButton13 == null) {

jButton13 = new JButton();

jButton13.setBounds(new Rectangle(233, 184, 44, 37));

jButton13.setText("=");

jButton13.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

second = Double.parseDouble(jTextField.getText());

if (way.equals("")){

jTextField.setText(""+second);

}

if (way.equals("+")){

result = first + second;

jTextField.setText(""+result);

}

if (way.equals("-")){

result = first - second;

jTextField.setText(""+result);

}

if (way.equals("*")){

result = first * second;

jTextField.setText(""+result);

}

if(way.equals("/")){

if (second != 0){

result = first / second;

jTextField.setText(""+result);

}else{

jTextField.setText("error");

}

}

jButton16.setEnabled(true);

}

});

}

return jButton13;

}

/**

* This method initializes jButton14

*

* @return javax.swing.JButton

*/

private JButton getJButton14() {

if (jButton14 == null) {

jButton14 = new JButton();

jButton14.setBounds(new Rectangle(290, 184, 44, 37));

jButton14.setText("C");

jButton14.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

jTextField.setText("0");

first = 0;

second = 0;

way = "";

ch = new char[12];

i = 0;

jButton16.setEnabled(true);

}

});

}

return jButton14;

}

/**

* This method initializes jButton15

*

* @return javax.swing.JButton

*/

private JButton getJButton15() {

if (jButton15 == null) {

jButton15 = new JButton();

jButton15.setBounds(new Rectangle(62, 231, 102, 26));

jButton15.setText("0");

jButton15.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

ch[i] = '0';

jTextField.setText(new String(ch).trim());

i++;

}

});

}

return jButton15;

}

/**

* This method initializes jButton16

*

* @return javax.swing.JButton

*/

private JButton getJButton16() {

if (jButton16 == null) {

jButton16 = new JButton();

jButton16.setBounds(new Rectangle(176, 231, 44, 26));

jButton16.setText(".");

jButton16.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent e) {

if(ch[0] == 0){

ch[i] = '0';

ch[i+1] = '.';

i++;

}else{

ch[i] = '.';

}

jTextField.setText(new String(ch).trim());

i++;

jButton16.setEnabled(false);

}

});

}

return jButton16;

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

SwingUtilities.invokeLater(new Runnable() {

public void run() {

Calculator thisClass = new Calculator();

thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

thisClass.setVisible(true);

}

});

}

/**

* This is the default constructor

*/

public Calculator() {

super();

initialize();

}

/**

* This method initializes this

*

* @return void

*/

private void initialize() {

this.setSize(356, 298);

this.setContentPane(getJContentPane());

this.setTitle("计算器");

this.setResizable(false);

}

/**

* This method initializes jContentPane

*

* @return javax.swing.JPanel

*/

private JPanel getJContentPane() {

if (jContentPane == null) {

jContentPane = new JPanel();

jContentPane.setLayout(null);

jContentPane.add(getJTextField(), null);

jContentPane.add(getJButton(), null);

jContentPane.add(getJButton1(), null);

jContentPane.add(getJButton2(), null);

jContentPane.add(getJButton3(), null);

jContentPane.add(getJButton4(), null);

jContentPane.add(getJButton5(), null);

jContentPane.add(getJButton6(), null);

jContentPane.add(getJButton7(), null);

jContentPane.add(getJButton8(), null);

jContentPane.add(getJButton9(), null);

jContentPane.add(getJButton10(), null);

jContentPane.add(getJButton11(), null);

jContentPane.add(getJButton12(), null);

jContentPane.add(getJButton13(), null);

jContentPane.add(getJButton14(), null);

jContentPane.add(getJButton15(), null);

jContentPane.add(getJButton16(), null);

}

return jContentPane;

}

} // @jve:decl-index=0:visual-constraint="437,27"

哥们！这是用eclipse中的visual editor做的，所以代码比较多，复制粘贴不方便，我可以发你邮箱。你把代码打上去，一样能运行的！！！

求大神发个完整简单的java计算器代码，

public static void main(String[] args) {

System.out.println("简单计算器");

boolean flag=true;//while循环是否继续，true继续循环，false停止循环

System.out.println("请输入第一个数字");

while(flag){

Scanner scan = new Scanner(System.in);

String bh=scan.next();

try {

double num = Double.parseDouble(bh);

System.out.println("请输入符号(+、-、*、/)");

while(1==1){

String fh=scan.next();

if("+".equals(fh) || "-".equals(fh) || "*".equals(fh) || "/".equals(fh)){

System.out.println("请输入第二个数字");

while(1==1){

String bh2=scan.next();

try {

double num2 = Double.parseDouble(bh2);

double num3=0;

if("+".equals(fh)){

num3=num+num2;

}else if("-".equals(fh)){

num3=num-num2;

}else if("*".equals(fh)){

num3=num*num2;

}else if("/".equals(fh)){

num3=num/num2;

}

System.out.println(num3);

break;

} catch (Exception e) {

System.out.println("请输入第二个正确的数字");

continue;

}

}

break;

}else{

System.out.println("请输入正确的符号(+、-、*、/)");

continue;

}

}

System.out.println("是否继续运算:输入Y或者y继续，输入其它任意字符退出");

String yn=scan.next();

if("Y".equals(yn) || "y".equals(yn)){

continue;

}else{

System.out.println("运算结束");

break;

}

}catch (NumberFormatException e) {//输入非数字类型时

System.out.println("请输入第一个正确的数字");

continue;

}

}

}