「java怎样做简易计算器」用java编写简易计算器
今天给各位分享java怎样做简易计算器的知识，其中也会对用java编写简易计算器进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！
本文目录一览：
如何用JAVA语言编写计算器小程序？
具体代码如下：
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class Calculator extends JFrame implements ActionListener {
private JFrame jf;
private JButton[] allButtons;
private JButton clearButton;
private JTextField jtf;
public Calculator() {
//对图形组件实例化
jf=new JFrame("任静的计算器1.0：JAVA版");
jf.addWindowListener(new WindowAdapter(){
public void windowClosing(){
System.exit(0);
}
});
allButtons=new JButton[16];
clearButton=new JButton("清除");
jtf=new JTextField(25);
jtf.setEditable(false);
String str="123+456-789*0.=/";
for(int i=0;iallButtons.length;i++){
allButtons[i]=new JButton(str.substring(i,i+1));
}
}
public void init(){
//完成布局
jf.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(jtf);
for(int i=0;i16;i++){
centerPanel.add(allButtons[i]);
}
southPanel.add(clearButton);
jf.add(northPanel,BorderLayout.NORTH);
jf.add(centerPanel,BorderLayout.CENTER);
jf.add(southPanel,BorderLayout.SOUTH);
addEventHandler();
}
//添加事件监听
public void addEventHandler(){
jtf.addActionListener(this);
for(int i=0;iallButtons.length;i++){
allButtons[i].addActionListener(this);
}
clearButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
Calculator.this.jtf.setText("");
}
});
}
//事件处理
public void actionPerformed(ActionEvent e) {
//在这里完成事件处理 使计算器可以运行
String action=e.getActionCommand();
if(action=="+"||action=="-"||action=="*"||action=="/"){
}
}
public void setFontAndColor(){
Font f=new Font("宋体",Font.BOLD,24);
jtf.setFont(f);
jtf.setBackground(new Color(0x8f,0xa0,0xfb));
for(int i=0;i16;i++){
allButtons[i].setFont(f);
allButtons[i].setForeground(Color.RED);
}
}
public void showMe(){
init();
setFontAndColor();
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args){
new Calculator().showMe();
}
}
用Java设计一个简单的计算器。
无聊写了个，修复了下Bug：
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
public class Calculate extends JFrame implements ActionListener {
private static final long serialVersionUID = 1L;
private JButton plus, reduce, multiply, divice, reset;
private JTextField one, two, result;
private boolean device_falg = false;
private final int width = 400, height = 300;
public Calculate() {
super("修改密码");
this.setLayout(null);
this.setSize(width, height);
init();
Layout();
}
public void init() {
plus = new JButton("加 ");
reduce = new JButton("减 ");
multiply = new JButton("乘 ");
divice = new JButton("除 ");
reset = new JButton("清空");
one = new JTextField();
two = new JTextField();
result = new JTextField();
}
public void Layout() {
this.add(new JLabel("第一个数")).setBounds(20, 10, 60, 80);
this.add(one).setBounds(100, 38, 100, 25);
this.add(new JLabel("第二个数")).setBounds(20, 40, 60, 80);
this.add(two).setBounds(100, 70, 100, 25);
this.add(new JLabel("结果")).setBounds(20, 85, 60, 80);
this.add(result).setBounds(100, 110, 100, 25);
this.add(plus).setBounds(70, 170, 80, 25);
this.add(reduce).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);
reduce.addActionListener(this);
multiply.addActionListener(this);
divice.addActionListener(this);
reset.addActionListener(this);
this.setVisible(true);
this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
public boolean Format() {
boolean FLAG = false;
boolean flag = false;
String one = this.one.getText().toString().trim();
String two = this.two.getText().toString().trim();
if (one == null || one.equals("") || two == null || two.equals("")) {
JOptionPane.showMessageDialog(getParent(), "请输入完整信息!");
FLAG = false;
flag = true;
}
boolean boll_1 = one.matches("[\\d]{1,100}");
boolean boll_2 = two.matches("[\\d]{1,100}");
boolean boll_3 = one.matches("[\\d]{1,100}+[.]+[\\d]{1,100}");
boolean boll_4 = two.matches("[\\d]{1,100}+[.]+[\\d]{1,100}");
if (flag) {
return false;
}
if ((boll_1 boll_2) || (boll_3 boll_4) || (boll_1 boll_4)
|| (boll_3 boll_2)) {
FLAG = true;
} else {
JOptionPane.showMessageDialog(getParent(), "请输入数字!");
FLAG = false;
}
if (FLAG device_falg) {
if (Double.parseDouble(two) == 0) {
JOptionPane.showMessageDialog(getParent(), "被除数不能为0!");
FLAG = false;
device_falg=false;
}
}
return FLAG;
}
public double Plus(double one, double two) {
return one + two;
}
public double Multiply(double one, double two) {
return one * two;
}
public double Divice(double one, double two) {
return one / two;
}
public double Reduce(double one, double two) {
return one - two;
}
public void Clear() {
one.setText("");
two.setText("");
result.setText("");
}
@Override
public void actionPerformed(ActionEvent e) {
Object o = e.getSource();
if (o == reset) {
Clear();
return;
}
if (o == divice) {
device_falg = true;
}
if (!Format()) {
return;
}
double one = Double.parseDouble(this.one.getText());
double two = Double.parseDouble(this.two.getText());
double result = 0;
if (o == plus) {
result = Plus(one, two);
} else if (o == reduce) {
result = Reduce(one, two);
} else if (o == multiply) {
result = Multiply(one, two);
} else if (o == divice) {
result = Divice(one, two);
}
this.result.setText("" + result);
}
public static void main(String[] args) {
new Calculate();
}
}
用java编写一个简单计算器
package swing;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
@SuppressWarnings("serial")
public class Calculator extends JFrame{
JTextField jt1 ,jt2 ,jt3;
JLabel jLabel;
JButton equButton,addButton,reduceButton,mulButton,divButton;
public Calculator() {
super("简易计算器");
JPanel contentPanel = new JPanel();
contentPanel.setLayout(new GridLayout(2, 0));
JPanel uJPanel = new JPanel();
Dimension preferredSize = new Dimension(50, 29);
GridBagConstraints gbc = new GridBagConstraints();
uJPanel.setLayout(new GridBagLayout());
gbc.gridx = GridBagConstraints.RELATIVE;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.insets = new Insets(1, 2, 1, 2);
jt1 = new JTextField(4);
jLabel = new JLabel();
jLabel.setPreferredSize(new Dimension(10, 29));
jt2 = new JTextField(4);
equButton = new JButton("=");
ActionListener myActionListener = new MyActionListener();
equButton.addActionListener(myActionListener);
jt3 = new JTextField(8);
jt1.setPreferredSize(preferredSize);
jt2.setPreferredSize(preferredSize);
jt3.setPreferredSize(preferredSize);
uJPanel.add(jt1,gbc);
uJPanel.add(jLabel,gbc);
uJPanel.add(jt2,gbc);
uJPanel.add(equButton,gbc);
gbc.weightx = 1;
uJPanel.add(jt3,gbc);
contentPanel.add(uJPanel);
JPanel dJPanel = new JPanel();
dJPanel.setLayout(new FlowLayout(FlowLayout.CENTER, 8, 2));
addButton = new JButton("+");
reduceButton = new JButton("-");
mulButton = new JButton("*");
divButton = new JButton("/");
addButton.addActionListener(myActionListener);
reduceButton.addActionListener(myActionListener);
mulButton.addActionListener(myActionListener);
divButton.addActionListener(myActionListener);
dJPanel.add(addButton);
dJPanel.add(reduceButton);
dJPanel.add(mulButton);
dJPanel.add(divButton);
contentPanel.add(dJPanel);
this.setContentPane(contentPanel);
this.pack();
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(3);
this.setVisible(true);
}
class MyActionListener implements ActionListener{
Double d1,d2,d3;
String operator = "";
public void actionPerformed(ActionEvent e) {
String fun = e.getActionCommand();
if (!fun.equals("=")) {
jLabel.setText(fun);
operator = fun;
}else {
d1 = jt1.getText().equals("")?null:Double.valueOf(jt1.getText());
d2 = jt2.getText().equals("")?null:Double.valueOf(jt2.getText());
d3 = calculate(d1,d2,operator);
jt3.setText(d3==null ? "":d3.toString());
jt3.setCaretPosition(0);
}
}
}
Double calculate(Double d1,Double d2,String operator){
if (d1 == null || d2 == null) {
return null;
}
Double d3 = null;
switch (operator) {
case "+":
d3 = d1 + d2;
break;
case "-":
d3 = d1 - d2;
break;
case "*":
d3 = d1 * d2;
break;
case "/":
d3 = d1 / d2;
break;
}
return d3;
}
public static void main(String[] args) {
new Calculator();
}
}
Java 简易计算器
package demo;
import java.util.Scanner;
public class Computer {
static Scanner s = new Scanner(System.in);
public static void main(String[] args) {
Computer c = new Computer();
c.run();
while(true){
System.out.println("是否继续?(1:继续,2:退出)");
String arg = s.nextLine();
if(arg.equals("1")){
c.run();
}else{
break;
}
}
}
public void run(){
System.out.println(" ------------简易计算器------------");
System.out.println("------------请如下选项中选择------------");
System.out.println("------------1.求和运算------------");
System.out.println("------------2.求差运算------------");
System.out.println("------------3.求积运算------------");
System.out.println("------------4.求商运算------------");
System.out.println("------------5.退出程序------------");
while(true){
System.out.println("请输入选项 ：");
try{
int arg = s.nextInt();
if(arg==5){
break;
}
System.out.print("请输入第一个运算值：");
setDim(s.nextDouble());
System.out.println("请输入第二个运算值：");
setDim(s.nextDouble());
System.out.print("结果为:");
double temp = 0;
if(arg==1){
temp=getAdd();
}else if(arg==2){
temp=getSub();
}else if(arg==3){
temp=getMul();
}else if(arg==4){
temp=getDiv();
}
System.err.println(temp);
}catch(Exception e){
System.out.println("输入数字不正确...");
s =s.reset();
continue;
}
}
}
private double num1 = 0;
private double num2 = 0;
public void setDim(double num){
if(num1 == 0){
num1 = num;
}else{
num2 = num;
}
}
/**
* 加法
*/
public double getAdd(){
return num1 + num2;
}
/**
* 减法
*/
public double getSub(){
return num1 - num2;
}
/**
* 乘法
*/
public double getMul(){
return num1 * num2;
}
/**
* 除法
*/
public double getDiv(){
return num1 / num2;
}
}
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.
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());
}
}
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