Java byte变成无符号整数~~~ 拂晓风起

public class Test{   
  
    public static void main(String[] args) {   
  
        byte bytes = -42;   
           
        int result = bytes&0xff;   
        System.out.println("无符号数: \t"+result);   
        System.out.println("2进制bit位: \t"+Integer.toBinaryString(result));   
    }   
}