The "Java" Java_11 operator

1. Operators(operator)

The Java language supports the following operators:

　　　　arithmetic operators : +,-,*,/,%, ++

　　　　assignment Operator =

relational operators : >,<,>=,<=,= = ,!= instanceof

logical operators : &&,| | , !

bitwise operators : &,| , ^ , ~ , >> , << , >>>

Conditional Operators ?

　　　　Extended Assignment Operators : + =,-=,*=,/=

2.Unary Operators(++, --)

int a = 3; int b = a++;   // after execution, b=3. Assign a value to B first and then increment it.  int c = ++a;   // after execution, c=5. Increment first, then assign a value to B

Note: the exponentiation in Java is handled:

int a = 3^2;    // this cannot be handled in Java, ^ is an XOR symbol.  double b = Math.pow (3, 2);

3. Two-dollar operator

Integer operations:

if the two operands have one Long, The result is also a long

When there is no long , the result is int. Even if the operands are all shot,byte, the result is an int.

Floating-point arithmetic:

If two operands have one double, The result is double.

only two of the operands are float, The result is float.

4.Boolean logical expression

logic with:&& and &, logic or:| | and the | , logical non-:!.

Logic and logic or the use of short-circuit methods . From left to right, if the determined value is no longer evaluated.

The logic returns false directly if there is a false.

logical OR as long as there is a true, then directly returns true;

Boolean c = 1>2&&2> (3/0);

5. Bitwise operators

~-- Take counter &-- bitwise AND

| --Bitwise or ^--bitwise XOR

<<: Left shift operator, >>: Right shift operator >>>: Unsigned shift operator

move right one is equivalent to 2 pick-up.

shift left one is equivalent to multiply by 2.

int a = 3*2*2; int b = 3<<2;  // equivalent: 3*2*2; int a = 12/2/2; int B = 12>>2;

6. Extension operators

Operator	Examples of usage	An equivalent expression
+=	A + = b	A = A+b
-=	A-= b	A = a-b
*=	A *= b	A = A*b
/=	A/= b	A = A/b
%=	A%= b	A = A%b

7. String connector

as long as one of the operands on either side of the "+" operator is a string (string) type , the system automatically converts the other operand to a string and then connects.

8. Three Mesh condition operator

Three-mesh conditional operator, syntax format:

　　X? Y:z

where x is a boolean expression, the value of X is evaluated first , and if true, the result of theentire trinocular operation is the value of the expression y . Otherwise the entire operation result is the value of the expression Z.

Problem with operator Precedence:

R to L	.   ( )   { }   ; , ++ --   ~ ! (data type)
L to R	* / %
L to R	+ -
L to R	<< >> >>>
L to R	< > <= >= instanceof
L to R	== !=
L to R	&
L to R	^
L to R	|
L to R	&&
L to R	||
R to L	? :
R to L	=   *=   /=   %= + = = <<= >>= >>>= &= ^= |=

CODE schematic:

 Public classtestoperator{ Public Static voidMain (string[] agrs) {//Simple Operators        intA = 1; intb = 2; intc = A +b; System.out.println ("The value of C is:" +c); //Unary Operators        intD = 1; inte =d++;//after execution, d=1. Assign the E value first and then increment        intf =++d;//after execution, f=3. Increment first, then assign value, here Increment 2 times, in E that already self-increment once. System.out.println ("E's value is:" +e); System.out.println (The value of "F" is: "+f); //Bitwise Operators        intm = 2; intn = 4; System.out.println (M&N); System.out.println (M|N); System.out.println (~N); System.out.println (M^N); //Three mesh operator        intA1 = 10; intA2 = 20; System.out.println ((A1>A2)?false:true); }}

The "Java" Java_11 operator