java的一些代码题

Question

谁能告诉俺 这几个题的代码是啥 考试大概就考这种手写代码 后天就考了

Answer 1

其实就是百元买百鸡问题的变种，只是数字换了下

public class Main {
    public static void main(String[] args) {
        for (int nan = 0; nan <= 36; nan++)
            for (int nv = 0; nv <= 36; nv++) 
                for (int hai = 0; hai <= 36; hai += 2)
                {
                    if (nan * 4 + nv * 3 + hai / 2 == 36 && nan + nv + hai == 36)
                   System.out.println(nan + "," + nv + "," + hai);
                }
    }
}
结果
3,3,30

回文数，最简单的是转换为字符串，再颠倒，比较颠倒前后

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入一个整数：");
        int number = scanner.nextInt();
        boolean isPalindrome = IsHW(number);
        System.out.println("是否为回文数：" + isPalindrome);
    }

    public static boolean IsHW(int n) {
        String original = String.valueOf(n);
        String reversed = new StringBuilder(original).reverse().toString();
        return original.equals(reversed);
    }
}

后面两个可以用Swing实现

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

public class Main {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

    private static void createAndShowGUI() {
        // 创建窗口
        JFrame frame = new JFrame("标签和文本框示例");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 150);

        // 创建面板
        JPanel panel = new JPanel();
        panel.setLayout(new FlowLayout());

        // 创建标签
        JLabel label = new JLabel("标签的值");
        panel.add(label);

        // 创建文本框
        JTextField textField = new JTextField(15);
        panel.add(textField);

        // 创建按钮
        JButton button = new JButton("复制标签");
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String labelText = label.getText();
                textField.setText(labelText);
            }
        });
        panel.add(button);

        // 将面板添加到窗口
        frame.getContentPane().add(panel);

        // 显示窗口
        frame.setVisible(true);
    }
}

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

public class Main {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

    private static void createAndShowGUI() {
        // 创建窗口
        JFrame frame = new JFrame("按钮示例");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 150);

        // 创建面板
        JPanel panel = new JPanel();
        panel.setLayout(new FlowLayout());

        // 创建确定按钮
        JButton okButton = new JButton("确定");
        okButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.out.println("OK");
            }
        });
        panel.add(okButton);

        // 创建退出按钮
        JButton exitButton = new JButton("退出");
        exitButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
        panel.add(exitButton);

        // 将面板添加到窗口
        frame.getContentPane().add(panel);

        // 显示窗口
        frame.setVisible(true);
    }
}