运算法则2

public class Demon2 {
public static void main(String[] args) {
long a =12134345L;
int b =123;
short c =12;
byte d =1;
System.out.println(a+b+c+d);//long
System.out.println(b+c+d);//int
System.out.println(c+d);//int
}
}

public class Demon3 {
public static void main(String[] args) {
int a = 20;
int b = 12;
int c = 51;
System.out.println(a>b);
System.out.println(a<b);
System.out.println(a==b);
System.out.println(a>=b);
System.out.println(a<=b);
System.out.println(a!=b);
System.out.println(c%a);//余数,取余数，模运算
//关系运算符返回的结果：正确，错误 布尔值
}
}