public class Tbyte{
    public static void main(String args[]){
        Byte b1=new Byte("a");
        
        int i1;
        i1=b1.intValue();
        
        System.out.println(i1);
    }
}

public class test {
    public static void main(String args[]) {
        Byte b1 = new Byte((byte)'a');

        int i1;
        i1 = b1.intValue();

        System.out.println(i1);
    }
}

------解决方案--------------------
Java code

String str = "127";//取值范围："-128","-127",...."-2","-1","0","1","2",....,"126","127"
Byte b1 = new Byte(str);//因为它只有八个二进制位，十进制形式为大于-128小于127
int i1;
i1 = b1.intValue();

/*
Constructs a newly allocated Byte object that represents the byte value indicated by the String parameter. The string is converted to a byte value in exactly the manner used by the parseByte method for radix 10. 
*/