Binary String to Integer conversion ..

Convert a Binary string to Integer...

code snippet:

method 1 :-
import java.util.*;

public class BinaryToInt{


public static void main(String nag[]){

Scanner console= new Scanner(System.in);

System.out.println("enter any binary number:");

String binaryString=console.next().trim();

System.out.println("int representation of the given binary is:"+binaryToInt(binaryString));


}


private static  int binaryToInt(String numberString){
int result=0;

int numberStringLength=numberString.length();
char[] binaryCharArray=new char[numberStringLength];

for(int i=0;i<numberStringLength;i++){
binaryCharArray[i]=numberString.charAt(i);
}

int[] binaryIntArray=convertBinaryCharArrayToBinaryIntArray(binaryCharArray);

result= calculateBinary(binaryIntArray);

return result;
}

private static int[] convertBinaryCharArrayToBinaryIntArray(char[] charArray){

int arrayLength=charArray.length;
int[] intArray=new int[arrayLength];

for(int i=0;i<arrayLength;i++){

if((int)charArray[i]==48){
intArray[i]=0;
}
if((int)charArray[i]==49){
intArray[i]=1;

}
}
return intArray;
}

private static  int calculateBinary(int[] binaryIntArray){

int value=0;
int arrayLength=binaryIntArray.length;


for(int i=0;i<arrayLength;i++){

value=value+binaryIntArray[i]*pow(2,(arrayLength-1)-i);

}

return value;
}

public static  int pow(int value, int power){

int v=1;
for(int i=0; i<power;i++){

// System.out.println("loop:"+(i-1));
v=v*value;
}
return v;
}
}//end class

method 2 :-
Use    Integer.parseInt(String str, int num);  directly