逻辑运算符、三元运算符

package operator;

//逻辑运算符
public class Demo01 {
    public static void main(String[] args) {
        //与（and）  或（or）  非（取反）
        boolean a = true;
        boolean b = false;

        System.out.println("a && b : "+(a&&b));
        System.out.println("a || b : "+(a||b));
        System.out.println("!(a && b) : "+!(a&&b));

        //短路运算
        int c = 5;
        boolean d = (c<4)&&(c++<4); //前面错了不会执行后面的
        System.out.println(d);
        System.out.println(c);

        int m = 5;
        boolean n = (m<4)||(++m>5);
        System.out.println(n);
        System.out.println(m);

        
    }
}

package operator;

public class Demo01 {
    public static void main(String[] args) {
        int a = 10;
        int b = 20;
        a+=b;   //a = a+b
        a-=b;   //a = a-b
        System.out.println(a);

        //字符串连接符
        System.out.println(a+b);
        System.out.println(""+a+b); //字符串连接符
        System.out.println(a+b+"");

        //三元运算符
        //x ? y : z
        //如果x==true，则结果为y，否则结果为z
        int score = 80;
        String type = score<60 ? "不及格" : "及格";
        System.out.println(type);

    }
}

(93条消息) Java运算符及运算符的优先级_feifuzeng的博客-CSDN博客_java运算符优先级