Generally speaking, the data you’re being asked to process most likely has not been input in the format you need. It comes in hexadecimal, octal, or even in binary formats.

Converting this data into decimal/integer format can be tedious. Fortunately, the Java API provides a method that performs this conversion without any overhead for the developer.

The method takes two arguments. The first argument is the string value that needs to be converted to integer format. The second argument establishes the type of the argument?whether it is in hexadecimal, octal, or binary format. In the following code, the syntax is Integer.parseInt(stringValue,radixValue);. stringValue is the value to be converted and radixValue is the value for hexadecimal, octal, or binary as 16, 8, or 2 respectively:

 String hexVal = "A"; //HexadecimalString octVal = "81"; //OctalString binVal = "1101"; //Binary System.out.println("Hex to Decimal. Hex = "+ hexVal + ", Decimal = "+Integer.parseInt(hexVal,16);System.out.println("Octal to Decimal. Hex = "+ octVal + ", Decimal = "+Integer.parseInt(octVal,8);System.out.println("Binary to Decimal. Hex = "+ binVal + ", Decimal = "+Integer.parseInt(binVal,2);

The result is the conversion from the respective formats to decimal value.