第二次作业-JZTXT

一、基本功能概述

包含登陆界面的计算器软件，该软件可实现加、减、乘、除的功能，并保存用户的历史计算记录。

二、实验环境

1、操作系统：Windows 11

2、开发工具：eclipse

三、程序流程图

1、登录界面的流程图

2、计算器流程图

四、完整源代码

（一）、登录界面

1、完整代码

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Jisuan {
public static void main(String[] args) {
JFrame frame = new JFrame("计算器登录界面");
frame.setSize(300, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JPanel panel = new JPanel();
frame.add(panel);
placeComponents(panel);

frame.setVisible(true);
}

private static void placeComponents(JPanel panel) {
panel.setLayout(null);

JLabel userLabel = new JLabel("用户名：");
userLabel.setBounds(10, 20, 80, 25);
panel.add(userLabel);

JTextField userText = new JTextField(20);
userText.setBounds(100, 20, 165, 25);
panel.add(userText);

JLabel passwordLabel = new JLabel("密码：");
passwordLabel.setBounds(10, 50, 80, 25);
panel.add(passwordLabel);

JPasswordField passwordText = new JPasswordField(20);
passwordText.setBounds(100, 50, 165, 25);
panel.add(passwordText);

JButton loginButton = new JButton("登录");
loginButton.setBounds(10, 80, 80, 25);
panel.add(loginButton);
loginButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String username = userText.getText();
String password = new String(passwordText.getPassword());
if (username.equals("田静雯") && password.equals("123456")) {
JOptionPane.showMessageDialog(null, "登录成功！");
} else {
JOptionPane.showMessageDialog(null, "用户名或密码错误！");
}
}
});

JButton registerButton = new JButton("注册");
registerButton.setBounds(180, 80, 80, 25);
panel.add(registerButton);
}
}

2、测试结果：

①登录界面

②登陆成功

③用户名或密码错误

（二）、计算器界面

1、完整代码

import javax.swing.*;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class CalculatorFrame extends JFrame {
private JTextField displayField;
private String currentInput;
private String operator;
private double firstOperand;
private boolean waitingForSecondOperand = false;

public CalculatorFrame() {
setTitle("田静雯的计算器");
setSize(400, 400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);

JPanel panel = new JPanel();
panel.setLayout(new BorderLayout());

displayField = new JTextField();
displayField.setEditable(false);
panel.add(displayField, BorderLayout.NORTH);

JPanel buttons = new JPanel();
buttons.setLayout(new GridLayout(4, 4));

String[] buttonLabels = {"7", "8", "9", "/", "4", "5", "6", "*", "1", "2", "3", "-", "0", ".", "=", "+"};
for (String label : buttonLabels) {
JButton button = new JButton(label);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
handleButtonClick(label);
}
});
buttons.add(button);
}
panel.add(buttons, BorderLayout.CENTER);

add(panel);
}

private void handleButtonClick(String label) {
if (label.equals("=")) {
performOperation();
} else if (label.equals("/") || label.equals("*") || label.equals("-") || label.equals("+")) {
handleOperator(label);
} else {
handleNumber(label);
}
}

private void handleOperator(String label) {
operator = label;
currentInput = displayField.getText();
firstOperand = Double.parseDouble(currentInput);
waitingForSecondOperand = true;
}

private void handleNumber(String number) {
if (waitingForSecondOperand) {
displayField.setText(number);
waitingForSecondOperand = false;
} else {
displayField.setText(displayField.getText() + number);
}
}

private void performOperation() {
double secondOperand = Double.parseDouble(displayField.getText());
double result;
switch (operator) {
case "/":
result = firstOperand / secondOperand;
break;
case "*":
result = firstOperand * secondOperand;
break;
case "-":
result = firstOperand - secondOperand;
break;
case "+":
result = firstOperand + secondOperand;
break;
default:
return;
}
displayField.setText(String.valueOf(result));
}

public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new CalculatorFrame().setVisible(true);
}
});
}
}

2、测试结果