JAVA二进制转换为十进制

import java.util.Scanner;

public class binaryToDecimal {

/**

* @param args

*/

public static int binary(String str){ //Scanner input=new

Scanner(System.in);

//System.out.print("Please input your string:");

//String str=input.next();

int len=str.length();

char ch;

int num=0;

for(int i=len-1;i>=0;i--){

ch=str.charAt(i);

if(ch!='0'&&ch!='1'){

System.out.println("input

wrong!!");

break;

}

if(ch=='1'){

num= (int)

(num+Math.pow(2,(len-1)-i));

}

}

return num;

}

public static void main(String[] args) { // TODO Auto-generated method stub

Scanner input=new Scanner(System.in);

while(true){

System.out.print("Please input your string:");

String str=input.next();

int total;

total=binary(str);

System.out.println("total="+total);

}

}

}