 ## Java program for binary to decimal conversion with Example

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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