operator-Demo05-06

package operator;
//=====================
//Demo05
//=====================
public class Demo05 {
    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));//逻辑于运算:两个变量都为真,结果才为true
        System.out.println("a || b:" + (a||b));//逻辑或运算:两个变量有一个为真,结果才为true
        System.out.println("!(a && b):" + !(a&&b));//如果是真,则为假; 如果是假,则为真

        //短路于是暖
        int c = 5;
        boolean d = (c<4)&&(c++<4);
        System.out.println(d);
        System.out.println(c);

    }
}

package operator;
//=====================
//Demo06
//=====================
public class Demo06 {
    public static void main(String[] args) {
        /*
        A = 0011 1100
        B = 0000 1101
        -------------------
        A&B = 0000 1100
        A|B = 0011 1101
        A^B = 0011 0001
        ~B  = 1111 0010

        2*8=16      2*2*2*2
        效率极高!!!
        <<      *2
        >>      /2

        0000 0000       0
        0000 0001       1
        0000 0010       2
        0000 0100       4
        0000 1000       8
        0001 0000       16

         */

        System.out.println(2<<3);
    }
}