Java basic Syntax (operator)

If the negative number is modulo, the modulus symbol can be ignored, such as: 5%-2 = 1

for/, Integer divide and decimal divide are distinguished, integers are divide, and integers are preserved to remove remainder

+ Besides the function of string addition, we can convert non-string into string

System.out.println ("5+5=" +5+5);    5+5=55

System.out.println (' * ' + ' \ t ' + ' * ');  93SYSTEM.OUT.PRINTLN ("*" + ' \ t ' + ' * ');  //* *

 Public classTestApp {@Test Public voidTest () {intI1 = 10, I2= 20; inti = i1++; System.out.print ("I=" +i);//i=10System.out.println ("i=" +i1);//i=11I= ++I1; System.out.print ("I=" +i);//i=12System.out.println ("i=" +i1);//i=12I= i2--; System.out.print ("I=" +i);//i=20System.out.println ("i=" +i2);//i=19I= --I2; System.out.print ("I=" +i);//i=18System.out.println ("i=" +i2);//i=18    }}                

Assignment operators:

You can use automatic types for type conversions when data on both sides is inconsistent

  public  class   TestApp {@Test  public  void   Test () { boolean  B1 = false  ;  //  if  (B1 = true  " System.out.println ( "The result is true"  else   System.out.println ( "Result false"    

 Public class TestApp {    @Test    publicvoid  Test () {        int i = 1;        *= 0.1;        System.out.println (i); // 0        i++;        System.out.println (i); // 1     }}

Comparison operators

logical operators

An expression that is used by logical operators to concatenate Boolean types

The difference between & and &&:

&, whether true or false, both sides are to be operated on.

&&, the left is false, not the operation on the right

^ (XOR) and (|) Differences: When both sides are true, the result is false

@Test Public voidTest () {intx = 1; intY=1; if(X++==2 & ++y==2) {x=7; } System.out.println ("X=" +x+ ", y=" +y);//x=2,y=2x= 1; Y= 1; if(x++==2 && ++y==2) {x=7; } System.out.println ("X=" +x+ ", y=" +y);//X=2,y=1x= 1; Y= 1; if(X++==1 | ++y==1) {x=7; } System.out.println ("X=" +x+ ", y=" +y);//x=7,y=2x= 1; Y= 1; if(X++==1 | | ++y==1) {x=7; } System.out.println ("X=" +x+ ", y=" +y);//X=7,y=1}

　　

Bitwise operators

Java basic Syntax (operator)