三元运算符

运算符

package operator;

public class Demo01 {
    public static void main(String[] args) {
        //二元运算符
        int a = 10;
        int b = 20;
        int c = 25;
        int d = 30;

        System.out.println(a+b);
        System.out.println(a-b);
        System.out.println(a*b);
        System.out.println(a/(double)b);


    }

}

---

package operator;

public class Demo02 {
    public static void main(String[] args) {
        long a = 212456882;
        int b = 123;
        short c = 10;
        byte d = 8;
        System.out.println(a+b+c+d);//long
        System.out.println(b+c+d);//int
        System.out.println(c+d);//int
        System.out.println(b+d);//int
    }
}

---

package operator;

public class Demo03 {
    public static void main(String[] args) {
        //关系运算返回结果 ： 正确  错误   布尔值
        //if

        int a = 10;
        int b = 20;
        int c = 22;

        //取余  模运算
        System.out.println(c%a);

        System.out.println(a>b);
        System.out.println(a<b);
        System.out.println(a==b);
    }


}

---

package operator;

public class Demo04 {
    public static void main(String[] args) {
        //++   --   自增  自减
        int a = 3;

        int b = a++;//执行完这行代码后，先给b赋值，再自增
        //a = a+1;
        System.out.println(a);

        // a = a + 1;
        int c = ++a;//执行完这行代码后,先自增，再给c赋值
        System.out.println(a);
        System.out.println(b);
        System.out.println(c);

        //幂运算 2^3=8
       double pow = Math.pow(2,3);
        System.out.println(pow);
    }
}

---

package operator;
//逻辑运算符
public class Demo5 {
    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));//与，两个变量都为真，结果才为真
        System.out.println("a || b :"+(a||b));//或，两个变量有一个为真，结果为真
        System.out.println("!(a || b) :"+!(a||b));//非 true变false  相反同理

        //短路运算
        int c= 5 ;
        boolean d = (c<4)&&(c++<4);
        System.out.println(d);
        System.out.println(c);
    }
}

---

package operator;

public class Demo06 {
    public static void main(String[] args) {
        /*
        A = 0011 1100
        B = 0000 1101
        --------------------------
        A&B = 0000 1100 (与)
        A|B = 0011 1101 (或)
        A^B = 0011 0001 (相同为0，不同为1)
        ~B = 1111 0010 (取反)

        2*8 = 16  2*2*2*2

        效率高！！！
        <<  *2
        >>  /2
        0000 0000 0
        0000 0001 1
        0000 0010 2
        0000 0011 3
        0000 0100 4
        0000 1000 8
        0001 000 16
         */
        System.out.println(2<<3);
    }
}

---

三元运算符

package operator;

public class Demo08 {
    public static void main(String[] args) {
        // x  ? y :  z
        //如果 x== true ,则结果为y，否则为z

        int score = 50 ;
        String type = score <60 ?"不及格" : "及格";

        //if

        System.out.println(type);

    }
}

标签：0000,int,System,运算符,println,三元,public,out
来源： https://www.cnblogs.com/zhongjianYuan/p/16479766.html