三元运算符and小结

 1 public class Demo3 {
 2     public static void main(String[] args) {
 3         int a = 10;
 4         int b = 20;
 5 
 6         a+=b;//a = a + b
 7         a-=b;//a = a - b
 8         System.out.println(a);
 9         //字符串连接符   +    ,String
10         System.out.println(""+a+b);//输出1020
11         System.out.println(a+b+"");//输出30
12     }
13 }
 1 public class Demo4 {
 2     //三元运算符
 3     public static void main(String[] args) {
 4         //x ? y : z
 5         //如果x == true,则结果为y,否则结果为z
 6 
 7         int score = 50;
 8         String type = score <60 ? "不及格" : "及格";//必须掌握!!!
 9         System.out.println(type);//输出为不及格
10     }
11 }

 

posted @ 2021-03-14 21:43  HeartlessHero  阅读(98)  评论(0)    收藏  举报