Logical operator, displacement operator

Logical operators

• &&（ And ） ||（ or ） ！（ Take the opposite ）

  boolean a=true;
  boolean b=false;
  Systen.out.pritnln("a&&b:"+(a&&b));// Logic and computation ： Both variables are true , The result is true false
  Systen.out.println("a||b:"+(a||b));// Logic or operation ： Two variables and one is true , The result is true true
  Systen.out.println("!(a&&b):"+!(a&&b));// The result is true , It becomes false , If true, it becomes false  true
  

• Short-circuit operation ( If the first condition is not satisfied, the next condition will not be executed )

  int c=5;
  boolean d=(c<4)&&(c++<4);
  Systen.out.pritnln(c);//5
  Systen.out.pritnln(d);//false
  

Displacement operators

• & 、|、^、~、>>、<<、

  /* 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  Efficient ！！！ << *2 >> /2 0000 0000 0 0000 0001 1 0000 0010 2 0000 0100 4 0000 1000 8 0001 0000 16 */
  Systen.out.pritnln(2<<3);//16