# How to Decode Hex in Java

## What is the formula to convert hexadecimal to decimal?

This is simple algorithm where you have to multiply positional value of binary with their digit and get the sum of these steps. Example-1 ‘ Convert hexadecimal number ABCDEF into decimal number. = (10485760+720896+49152+3328+224+15)10 = (11259375)10 which is answer.

## What is hex in binary?

Hexadecimal (or hex) is a base 16 system used to simplify how binary is represented. A hex digit can be any of the following 16 digits: 0 1 2 3 4 5 6 7 8 9 A B C D E F. Each hex digit reflects a 4-bit binary sequence.

## What is charAt in Java?

The charAt() method returns the character at the specified index in a string. The index of the first character is 0, the second character is 1, and so on.

## What do the replaceAll () do?

The replaceAll() method returns a new string with all matches of a pattern replaced by a replacement . The pattern can be a string or a RegExp , and the replacement can be a string or a function to be called for each match.

## What is reverse method in Java?

reverse() is an inbuilt method which is used to reverse the characters in the StringBuffer. The method causes this character sequence to be replaced by the reverse of the sequence.

## How do I turn a string into an int?

We can convert String to an int in java using Integer. parseInt() method. To convert String into Integer, we can use Integer. valueOf() method which returns instance of Integer class.

## What is 0xff hexadecimal in decimal?

Representing 0xff With Different Data Types Java allows us to define numbers interpreted as hex (base 16) by using the 0x prefix, followed by an integer literal. The value 0xff is equivalent to 255 in unsigned decimal, -127 in signed decimal, and 11111111 in binary.

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## What is hex code?

Hex color codes are one type of HTML color code that you’ll often hear referred to as hexadecimal color or hex. The reason to use hexadecimal numbers is it’s a human-friendly representation of values in binary code. Hex color codes start with a pound sign or hashtag (#) and are followed by six letters and/or numbers.