There are two methods for converting a binary number to a decimal number(binary to decimal conversion):

1) Using the Integer class’s Integer.parseInt() method.
2) Perform conversion by writing your own logic rather than relying on predefined methods.

Example: Binary to Decimal conversion using Integer.parseInt() method

import java.util.Scanner;
class BinaryToDecimal {
    public static void main(String args[]){
       Scanner input = new Scanner( System.in );
       System.out.print("Enter a binary number: ");
       String binaryString =input.nextLine();
       System.out.println("Output: "+Integer.parseInt(binaryString,2));
    }
}

Output:

Enter a binary number: 1101
Output: 13

Example 2: Conversion without using parseInt

public class Details {
 
  public int BinaryToDecimal(int binaryNumber){
 
    int decimal = 0;
    int p = 0;
    while(true){
      if(binaryNumber == 0){
        break;
      } else {
          int temp = binaryNumber%10;
          decimal += temp*Math.pow(2, p);
          binaryNumber = binaryNumber/10;
          p++;
       }
    }
    return decimal;
  }
 
  public static void main(String args[]){
    Details obj = new Details();
    System.out.println("110 --> "+obj.BinaryToDecimal(110));
    System.out.println("1101 --> "+obj.BinaryToDecimal(1101));
    System.out.println("100 --> "+obj.BinaryToDecimal(100));
    System.out.println("110111 --> "+obj.BinaryToDecimal(110111));
  }
}

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Output:

110 –> 6
1101 –> 13
100 –> 4
110111 –> 55

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binary to decimal conversion binary to decimal conversion binary to decimal conversion binary to decimal conversion binary to decimal conversion binary to decimal conversion

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