「java设计简易计算器」java程序设计计算器
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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();
}
}
用java编写简易计算器程序
//布局没有调整，需要你自己去调整
代码如下：
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class JieMian extends JFrame implements ActionListener{
JTextField c1;
JTextField c2;
JLabel c;
JLabel equal=new JLabel("=");
JLabel result;
JLabel choose=new JLabel("请选择");
JButton add=new JButton("+");
JButton sub=new JButton("-");
JButton mul=new JButton("×");
JButton div=new JButton("÷");
JButton cal=new JButton("计算");
JButton clear=new JButton("清除");
public JieMian(){
setLayout(new FlowLayout());
c1=new JTextField(5);
c2=new JTextField(5);
c=new JLabel("+");
result=new JLabel("");
add(c1);
add(c);
add(c2);
add(equal);
add(result);
add(choose);
add(add);
add(sub);
add(mul);
add(div);
add(cal);
add(clear);
add.addActionListener(this);
sub.addActionListener(this);
mul.addActionListener(this);
div.addActionListener(this);
cal.addActionListener(this);
clear.addActionListener(this);
setVisible(true);
pack();
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource()==add){
c.setText("+");
}else if(e.getSource()==sub){
c.setText("-");
}else if(e.getSource()==mul){
c.setText("×");
}else if(e.getSource()==div){
c.setText("÷");
}else if(e.getSource()==cal){
double cc1,cc2;
try{
cc1=Double.parseDouble(c1.getText());
}catch(Exception ex){
cc1=0;
}try{
cc2=Double.parseDouble(c2.getText());
}catch(Exception ex){
cc2=0;
}
if(c.getText()=="+"){
result.setText(String.valueOf(cc1+cc2));
}else if(c.getText()=="-"){
result.setText(String.valueOf(cc1-cc2));
}else if(c.getText()=="×"){
result.setText(String.valueOf(cc1*cc2));
}else if(c.getText()=="÷"){
if(cc2!=0){
result.setText(String.valueOf(cc1/cc2));
}else{
result.setText("NAN");
}
}
}else if(e.getSource()==clear){
c1.setText("");
c2.setText("");
result.setText("");
}
}
public static void main(String args[]){
JieMian jiemian=new JieMian();
}
}
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发布于：2022-12-10，除非注明，否则均为原创文章，转载请注明出处。