Java Convert Hexadecimal to Decimal

In Java, you can convert a hexadecimal string to decimal using the Integer.parseInt() method by passing the hexadecimal string and the radix value 16 as arguments. Here’s an example:

String hex = "1A"; // hexadecimal string
int decimal = Integer.parseInt(hex, 16); // convert hexadecimal to decimal
System.out.println(decimal); // prints "26"

In this example, the hex variable contains the hexadecimal string “1A”. The Integer.parseInt() method is called with the hex string and the radix value 16 as arguments, which tells Java to interpret the string as a hexadecimal number. The method returns an integer value, which is then stored in the decimal variable. Finally, the decimal value is printed to the console using the System.out.println() method.

Java Hexadecimal to Decimal conversion: Integer.parseInt()

Yes, in Java, you can use the Integer.parseInt() method to convert a hexadecimal string to a decimal integer value.

The parseInt() method takes two arguments: the string to be parsed and the radix or base of the number system used in the string. In the case of a hexadecimal string, the radix should be 16.

Here’s an example of how to use Integer.parseInt() to convert a hexadecimal string to a decimal integer:

String hexString = "4D2"; // hexadecimal string
int decimalInt = Integer.parseInt(hexString, 16); // convert hexadecimal to decimal
System.out.println(decimalInt); // prints "1234"

In this example, we have a hexadecimal string “4D2”. We pass this string as the first argument to parseInt(), and 16 as the second argument to specify that we want to parse it as a hexadecimal number. The parseInt() method returns an integer value, which is then assigned to the decimalInt variable. Finally, we print the decimal integer value using the System.out.println() method.

Java Hexadecimal to Decimal conversion: Custom Logic

In Java, you can also implement a custom logic to convert a hexadecimal string to a decimal integer value. Here’s an example of how to do that:

public static int hexToDecimal(String hexString) {
    int decimal = 0;
    String hexDigits = "0123456789ABCDEF";
    hexString = hexString.toUpperCase();

    for (int i = 0; i < hexString.length(); i++) {
        char c = hexString.charAt(i);
        int d = hexDigits.indexOf(c);
        decimal = 16 * decimal + d;
    }

    return decimal;
}

n this example, we have defined a static method hexToDecimal() that takes a hexadecimal string as an argument and returns the equivalent decimal integer value.

Inside the method, we first initialize a decimal variable to 0. We also define a hexDigits string that contains the characters used in the hexadecimal number system. We convert the input hexadecimal string to uppercase using the toUpperCase() method to handle both lowercase and uppercase input strings.

We then loop through each character in the hexadecimal string and use the indexOf() method of hexDigits to find its corresponding decimal value. We then multiply the current decimal value by 16 and add the decimal value of the current hexadecimal digit to the running total.

Finally, we return the resulting decimal integer value.

Here’s an example of how to use the hexToDecimal() method:

String hexString = "4D2"; // hexadecimal string
int decimalInt = hexToDecimal(hexString); // convert hexadecimal to decimal using custom logic
System.out.println(decimalInt); // prints "1234"

In this example, we pass the hexadecimal string “4D2” as an argument to the hexToDecimal() method, which returns the decimal integer value 1234. We then print this value to the console using the System.out.println() method.