Convert Binary to Decimal number

Convert Binary to Decimal number in Java. OR
Write a program to convert Binary to Decimal number in Java.

Algorithm

1. Compress a given string in-place and with constant extra space.
2. Check whether a given string is an interleaving of String 1 and String 2.
3. Given two words (beginWord and endWord), and a dictionary's word list, find the length of shortest transformation sequence from beginWord to endWord.
4. Serialize and Deserialize a Binary Tree
5. Advanced Multithreading Interview Questions In Java

  Convert Binary to Decimal number in Java.

package javabypatel;

public class ConvertBinaryToDecimal {
 
 public static void main(String[] args) {
  System.out.println(binaryToInt(101)); 
 }

 public static int binaryToInt(int number){
  int index = 0;
  int sum = 0;
  
  while (number > 0){
   
   int lastBit = number % 10; //Get last bit of binary number
   
   sum += Math.pow(2, index) * lastBit; 
   //sum all corresponding position value. 
   //lastBit will be either 1 or 0 as it is binary number, so if bit is not set that is 0, then that value will be 0.
   //If bit is set that is 1, then we sum value of corresponding position using Math.pow(2, index).
   
   number = number/10; //we already checked last bit above, so discard it in next iteration.
   index++; //Increment index for next position.
  }
  return sum;
 }
}