三元运算符 小结

package operator;

public class sanyuan {
    public static void main(String[] args) {
        int a=10;
        int b=20;
        a+=b;//a=a+b
        System.out.println(a);
        a-=b;//a=a-b
        System.out.println(a);
        //字符串连接  + ， String
        System.out.println(""+a+b);//1020
        System.out.println(a+b+"");//30
    }
}

package operator;

public class sanyuanpanduan {
    public static void main(String[] args) {
        //三元运算
        //x?y:z
        //x==ture?则结果为y,否则为z
        int score =80;
        int a=50;
        String type=score<60?"不及格":"及格";
        System.out.println(type);//及格
        String b=a<60?"不及格":"及格";
        System.out.println(b);//不及格
    }
}