Java8的新特性,二进制序列转十进制数字

package kata_007_二进制序列转十进制int;
/**
 * java8 Lambda表达式转换binary序列->十进制数
 */
import java.util.ArrayList;

public class ShortBinaryToDecimal {

    public static void main(String[] args) {

        ArrayList<Integer> binary = new ArrayList();
        binary.add(1);
        binary.add(0);
        binary.add(1);
        binary.add(0);
        int result = binaryToDecimal(binary);
        System.out.println(result);
    }
    
    public static int binaryToDecimal(ArrayList<Integer> binary) {
          return binary.stream().reduce((x, y) -> x * 2 + y).get();
    }

}

package kata_007_二进制序列转十进制int;

import java.awt.List;
import java.util.ArrayList;

public class TestBinaryToDecimal {

    public static void main(String[] args) {
        
        //test method
        ArrayList binary = new ArrayList();
        binary.add(1);
        binary.add(0);
        binary.add(0);
        binary.add(1);
        int result = binaryToDecimal(binary);
        System.out.println(result);
    }
    
    public static int binaryToDecimal(ArrayList<Integer> binary) {
        String binaryStr = "";
        for(int i=0;i<binary.size();i++) {
            binaryStr += binary.get(i);
        }
        //String binary -> String decimal
        String decimalStr = Integer.valueOf(binaryStr,2).toString();
        //String decimal -> int
        int decimalResult = Integer.parseInt(decimalStr);
        
        
        return decimalResult;
    }

}