java嵌套循环

Question

它给出了以下错误:对于参数类型,运算符==未定义
boolean,int标记语法错误,删除这些标记

package javaproject;

public class NestedIFandIFandElse {
    public static void main(String[] args) {
        int vanus = 50;

        if (vanus == 40) {
            System.out.println("first if ");
        } else {
            System.out.print("first else");

            if (vanus == 50 ?? vanus == 20) {
                System.out.println("second if");
            } else {
                System.out.println("second else");
            }
        }
    }
}

Answer 1

你应该??改为||.它们看起来一样,但它们不是:

if (vanus == 50 || vanus == 20)