From hexadecimal to decimal: JAVA programming implementation

1. JAVA programming: Convert the input hexadecimal number string into a decimal number and output it?

You can use Java's built-in functions and methods to convert the input hexadecimal number string into a decimal number and output it. The following is a possible method:

import java.util.Scanner;

public class HexToDecimal {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        
        System.out.print("请输入一个16进制数字串: ");
        String hexString = scanner.nextLine();
        
        try {
            // 使用parseInt方法将16进制字符串转换为10进制整数
            int decimalValue = Integer.parseInt(hexString, 16);
            
            // 输出10进制结果
            System.out.println("转换为10进制结果: " + decimalValue);
        } catch (NumberFormatException e) {
            System.out.println("无效的输入，请确保输入的是有效的16进制数字串。");
        }
        
        scanner.close();
    }
}

The above Java program first accepts the hexadecimal number string entered by the user, and then uses the Integer.parseInt() method to convert it to decimal integer and finally output the result.

2. How does java convert a hexadecimal number into a decimal number?

In Java, to convert a hexadecimal number to a decimal number, you can use the Integer.parseInt() method, as shown below:

public class HexToDecimal {
    public static void main(String[] args) {
        String hexValue = "1A"; // 要转换的十六进制数
        
        try {
            int decimalValue = Integer.parseInt(hexValue, 16);
            System.out.println("十六进制数 " + hexValue + " 转换为十进制数为: " + decimalValue);
        } catch (NumberFormatException e) {
            System.out.println("无效的十六进制数。");
        }
    }
}

In the above code, Integer.parseInt(hexValue, 16)converts the hexadecimal string hexValue to a decimal integer and outputs the result.

3. How to program in Java to convert hexadecimal to decimal?

To convert hexadecimal to decimal in Java, you can use the Integer.parseInt() method, as shown below:

public class HexToDecimal {
    public static void main(String[] args) {
        String hexValue = "1A"; // 要转换的十六进制数
        
        try {
            int decimalValue = Integer.parseInt(hexValue, 16);
            System.out.println("十六进制数 " + hexValue + " 转换为十进制数为: " + decimalValue);
        } catch (NumberFormatException e) {
            System.out.println("无效的十六进制数。");
        }
    }
}

The above code , Integer.parseInt(hexValue, 16)Convert the hexadecimal string hexValue to a decimal integer and output the result.

Summary: In Java, you can convert a string of hexadecimal numbers to a decimal integer using the Integer.parseInt() method. Make sure to provide valid hexadecimal input and handle NumberFormatException in your code to handle invalid input.

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