Java程序示例，展示十六进制的使用方法

Here, the usage of Hexadecimal shall be demonstrated through the Java Program.

Let us get acquainted with the term Hexadecimal before seeing a Java program.

The Hexadecimal is a type of number system that has a base value of 16. There are 16 symbols representing hexadecimal numbers. These symbols or values are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, and F. Each digit represents a decimal value. 

十六进制数从0到9相当于十进制数从0到9。

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此外，A代表10，B代表11，C代表12，D代表13，E代表14，F代表15。

Demonstrating the usage of the Hexadecimal number system through certain examples:

• Converting Decimal numbers to Hexadecimal numbers

• Converting Hexadecimal numbers to Decimal numbers

• Converting Hexadecimal numbers to long number

• 将长数字转换为十六进制数字

转化的基础知识

Consider any decimal value and convert it into a hexadecimal number system.

Let us consider the decimal number 775 .

因此，相应的十六进制值为307

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Let us consider another decimal number 1256.

因此，相应的十六进制值 = 4E8

Example 1

示例1

Let us see a java program to convert a decimal number into its corresponding Hexadecimal number.

// Java program to convert a decimal
// number into a hexadecimal number
import java.io.*;
public class DectoHexadecimal {
	// method to convert decimal to hexadecimal number system
	static void decToHexa(int num)	{
		// char array that stores the hexadecimal number
		char[] hexaDec = new char[100];
		int j = 0;
		while (num != 0) {
			// temporary variable to store the remainder
			int t = 0;
			// storing the remainder in the temp variable.
			t = num % 16;
			// check if temp < 10
			if (t < 10) {
				hexaDec[j] = (char)(t + 48);
				j++;
			} else {
				hexaDec[j] = (char)(t + 55);
				j++;
			}

			num = num / 16;
		}
		// hexadecimal number array in reverse order
	
		for (int k = j - 1; k >= 0; k--)
			System.out.print( hexaDec[k]);
	}
	public static void main(String[] args){
		int num = 4698;
		System.out.print("Hexadecimal equivalent of " +num+ " is " );
		decToHexa(num);
	}
}

Output

Hexadecimal equivalent of 4698 is 125A

This Program is written to demonstrate the working of Hexadecimal number systems. Here, a decimal number is assigned in a variable and the same is converted into a corresponding Hexadecimal number using custom logic.

Example 2

示例2

Let us see a java program to convert a decimal number into its corresponding Hexadecimal number using a predefined function that is a library function toHexString.

// Java Program to demonstrate the Usage of HexaDecimal
import java.io.*;
public class DecimaltoHex {
	// Main  method
	public static void main(String[] args){
		//Decimal number to be converted
		int d = 986;
		// Using the toHexString() method to convert decimal value to its 
		// corresponding hexadecimal value
		String hexd = Integer.toHexString(d);
		// Displaying hexaDec value
		System.out.println("Hexadecimal value of " +d+ " is " + hexd);
	}
}

Output

Hexadecimal value of 986 is 3da

这是另一个演示十六进制数使用方法的程序。在这里，使用 toHexString 方法将十进制数转换为相应的十六进制数。 

Example 3

示例3

Let us see a java program to convert a Hexadecimal number into its corresponding decimal number using a library function parseInt.

// Java program to convert Hexadecimal numbers to corresponding Decimal number
import java.io.*;
public class HexToDecimal {
	// Main method
	public static void main(String[] args)	{
		// Random Hexadecimal number stored in a string
		String hexd = "4B6A";
		// Passing hexd and base 16 as parameters
		// to parseInt method
		int dec = Integer.parseInt(hexd, 16);
		// Displaying the corresponding
		// decimal value of a hexadecimal number
		System.out.println("Corresponding Decimal value of" + hexd + " is " + dec);
	}
}

Output

Corresponding Decimal value of4B6A is 19306

This Program is written to demonstrate the working of Hexadecimal number systems. Here, a Hexadecimal number is assigned to a variable and is converted into its corresponding decimal number using a library function integer.parseInt .

Example 4

Let us see a java program to convert a Hexadecimal number into its corresponding long number using a library function Long.toHexString.

// Java Program to demonstrate the Usage of HexaDecimal
import java.io.*;
public class LongToHex {
	// Main method
	public static void main(String[] args)	{
		// Long number to be converted 
		long l = 2028;
		// Storing the result in a string hexd
		String hexd = Long.toHexString(l);
		// Displaying the corresponding hexadecimal value
		System.out.println("Corresponding Hex value of long number " +l+ " is " + hexd);
	}
}

Output

Corresponding Hex value of long number 2028 is 7ec

这个程序是为了演示十六进制数系统的工作原理而编写的。在这里，一个十六进制数被赋给一个变量，并使用库函数Long.toHexString将其转换为相应的长整数。

Example 5

让我们看一个Java程序，使用库函数 toHexString 将一个长整型数转换为其对应的十六进制数。

// Java Program to Illustrate the Usage of HexaDecimal by converting a hexadecimal value into long value
import java.io.*;
public class HexToLong {
    // Main method
    public static void main(String[] args) {
        // Hexadecimal number to be converted
        String hs = "7850";
        // passing hs and base 16 as parameters
        //  to parseLong function
        long l = Long.parseLong(hs, 16);
        // Displaying the corresponding hexadecimal value
        System.out.println("Corresponding Long value of hexadecimal no. " +hs+ " is " + l);
    }
}

Output

Corresponding Long value of hexadecimal no. 7850 is 30800

This Program is written to demonstrate the working of Hexadecimal number systems. Here, a hexadecimal number is assigned to a variable and is converted into its corresponding long number using a library function Long.parseLong

本文讲解了在Java中使用十六进制的用法。我们展示了四种使用十六进制值的方法。我们还看到了五种不同的实现方式，以了解其用法。