Java实现二进制与十进制之间互相转换的完整代码

public class DecimalToBinary {
    public static void main(String[] args) {
        int decimal = 42;
        String binary = Integer.toBinaryString(decimal);
        System.out.println("十进制 " + decimal + " 转换为二进制为: " + binary);
    }
}

十进制 42 转换为二进制为: 101010

public class BinaryToDecimal {
    public static void main(String[] args) {
        String binary = "101010";
        int decimal = Integer.parseInt(binary, 2);
        System.out.println("二进制 " + binary + " 转换为十进制为: " + decimal);
    }
}

二进制 101010 转换为十进制为: 42

import java.util.Scanner;

public class BinaryDecimalConverter {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请选择操作：");
        System.out.println("1. 十进制转二进制");
        System.out.println("2. 二进制转十进制");
        int choice = scanner.nextInt();

        if (choice == 1) {
            System.out.print("请输入十进制数字: ");
            int decimal = scanner.nextInt();
            String binary = Integer.toBinaryString(decimal);
            System.out.println("转换后的二进制为: " + binary);
        } else if (choice == 2) {
            System.out.print("请输入二进制数字: ");
            String binary = scanner.next();
            try {
                int decimal = Integer.parseInt(binary, 2);
                System.out.println("转换后的十进制为: " + decimal);
            } catch (NumberFormatException e) {
                System.out.println("输入的不是有效的二进制数字！");
            }
        } else {
            System.out.println("无效的选择！");
        }

        scanner.close();
    }
}