java 運算子參考手冊

Precedence     Operator     Description                          Association
1              ++,--        Postincrement, Postdecrement         R -> L
2              ++,--        Preincrement, Predecrement           R -> L
               +,-          Unary plus, unary minus              R -> L
               ~            Bitwise compliment                   R -> L
               !            Boolean NOT                          R -> L
3              new          Create object                        R -> L
               (type)       Type cast                            R -> L
4              *,/,%        Multiplication, division, remainder  L -> R
5              +,-          Addition, subtraction                L -> R
               +            String concatenation                 L -> R
6              <<, >>, >>>  Left shift, right shift, unsigned right shift     L -> R
7              <, <=, >, >=                                      L -> R
               instanceof   Type comparison                      L -> R
8              ==, !=       Value equality and inequality        L -> R
               ==, !=       Reference equality and inequality    L -> R
9              &            Boolean AND                          L -> R
               &            Bitwise AND                          L -> R
10             ^            Boolean XOR                          L -> R
               ^            Bitwise XOR                          L -> R
11             |            Boolean OR                           L -> R
               |            Bitwise OR                           L -> R
12             &&           Conditional AND                      L -> R
13             ||           Conditional OR                       L -> R
14             ?:           Conditional Ternary Operator         L -> R
15             =,+=,-=,     Assignment Operators                 R -> L
               *=,/ =,%=,
               &=,^=, |=,
               <<=, >> =,
               >>>=

Operator Precedence Group Associativity Operator Precedence
(), [], postfix ++, postfix -- left Highest
unary +, unary -, prefix ++, prefix --, ~, ! right 
(type), new left 
*, /, % left 
+, - left 
<<, >>, >>> left 
< ,<= , >, >=, instanceof  
==, !=  
& left 
^ left 
| left 
&& left 
|| left 
?: left 
=, +=, -=, *=, /=, %=, <<=, >>=, >>>=, &=, |=, ^= right lowest

簡單加號運算

public class MainClass {

  public static void main(String[] arg) {
    int count = 1;

    count += 5;
    System.out.println(count);

    count = count + 5;
    System.out.println(count);

  }

}

條件運行與逗號運算子

if(value > conditionValue){
  result = result1;
}else{
  result = result2;
}

 logical_expression ? expression1 : expression2
 
public class MainClass {
  public static void main(String[] args) {
    int v = 1;
    System.out.println(v == 1 ? "A" : "B");

    v++;
    System.out.println(v == 1 ? "A" : "B");
  }
}