Java编写简易计算器界面：实现加减乘除功能 |21xrx.com

Java编写简易计算器界面：实现加减乘除功能

2023-06-16 09:52:01 深夜i 12 0

Java 计算器界面加减乘除

Java是一种高级编程语言，广泛应用于各行各业。在本篇文章中，我们将使用Java编写一个简易计算器界面，实现加减乘除功能。

我们首先需要创建一个Java工程，并在工程中创建一个名为“Calculator”的Java类。接着，我们需要引入Java Swing和AWT包，以便实现计算器界面的可视化。

下面是完整的Java代码实现：

java
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator extends JFrame {
  private JTextField textField;
  private double firstNum, secondNum, result;
  private String operation;
  // 构造函数
  public Calculator() {
    setTitle("简易计算器");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setLocationRelativeTo(null);
    setResizable(false);
    // 界面布局
    JPanel buttonPanel = new JPanel();
    buttonPanel.setLayout(new GridLayout(5, 4));
    // 文本框
    textField = new JTextField();
    textField.setHorizontalAlignment(JTextField.RIGHT);
    textField.setEditable(false);
    textField.setBackground(Color.WHITE);
    // 操作按钮
    JButton addButton = new JButton("+");
    addButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        operation = "+";
        firstNum = Double.parseDouble(textField.getText());
        textField.setText("");
      }
    });
    JButton subtractButton = new JButton("-");
    subtractButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        operation = "-";
        firstNum = Double.parseDouble(textField.getText());
        textField.setText("");
      }
    });
    JButton multiplyButton = new JButton("*");
    multiplyButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        operation = "*";
        firstNum = Double.parseDouble(textField.getText());
        textField.setText("");
      }
    });
    JButton divideButton = new JButton("/");
    divideButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        operation = "/";
        firstNum = Double.parseDouble(textField.getText());
        textField.setText("");
      }
    });
    // 数字按钮
    JButton button1 = new JButton("1");
    button1.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textField.setText(textField.getText() + "1");
      }
    });
    JButton button2 = new JButton("2");
    button2.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textField.setText(textField.getText() + "2");
      }
    });
    JButton button3 = new JButton("3");
    button3.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textField.setText(textField.getText() + "3");
      }
    });
    JButton button4 = new JButton("4");
    button4.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textField.setText(textField.getText() + "4");
      }
    });
    JButton button5 = new JButton("5");
    button5.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textField.setText(textField.getText() + "5");
      }
    });
    JButton button6 = new JButton("6");
    button6.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textField.setText(textField.getText() + "6");
      }
    });
    JButton button7 = new JButton("7");
    button7.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textField.setText(textField.getText() + "7");
      }
    });
    JButton button8 = new JButton("8");
    button8.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textField.setText(textField.getText() + "8");
      }
    });
    JButton button9 = new JButton("9");
    button9.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textField.setText(textField.getText() + "9");
      }
    });
    JButton button0 = new JButton("0");
    button0.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textField.setText(textField.getText() + "0");
      }
    });
    // 等于按钮
    JButton equalsButton = new JButton("=");
    equalsButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        secondNum = Double.parseDouble(textField.getText());
        switch (operation) {
          case "+":
            result = firstNum + secondNum;
            break;
          case "-":
            result = firstNum - secondNum;
            break;
          case "*":
            result = firstNum * secondNum;
            break;
          case "/":
            result = firstNum / secondNum;
            break;
          default:
            break;
        }
        textField.setText("" + result);
      }
    });
    // 清除按钮
    JButton clearButton = new JButton("C");
    clearButton.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        textField.setText("");
      }
    });
    // 添加组件到按钮面板
    buttonPanel.add(button1);
    buttonPanel.add(button2);
    buttonPanel.add(button3);
    buttonPanel.add(addButton);
    buttonPanel.add(button4);
    buttonPanel.add(button5);
    buttonPanel.add(button6);
    buttonPanel.add(subtractButton);
    buttonPanel.add(button7);
    buttonPanel.add(button8);
    buttonPanel.add(button9);
    buttonPanel.add(multiplyButton);
    buttonPanel.add(clearButton);
    buttonPanel.add(button0);
    buttonPanel.add(equalsButton);
    buttonPanel.add(divideButton);
    // 添加组件到窗体
    add(buttonPanel, BorderLayout.CENTER);
    add(textField, BorderLayout.NORTH);
    // 显示窗体
    pack();
    setVisible(true);
  }
  // 主函数
  public static void main(String[] args) {
    new Calculator();
  }
}

现在我们已经实现了一个简易的计算器界面，包括加减乘除和清除功能。我们可以在主函数中调用Calculator类来显示计算器窗口。

三个

上一篇: idea打包java可执行jar包

下一篇: 如何使用C语言判断输入为空

评论区

相似文章