方法的调用

package day2;
/*void只可单独调用不可打印和赋值
public class Hello {
    public static void main(String[] args) {
      //单独调用
        sum(10,20);
        //打印调用
        System.out.println(sum(10,20));
        //赋值调用
        int n =sum(15,35);
        System.out.println(n);


    }
    public static int sum(int a,int b){
        System.out.println("执行了");
        int result = a+b;
        return result;
    }
}