Rule of Precedence in Java
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When two or more operator in an expression then which will be evaluated first, operator work in with the higher precedence goes first. For example, 1 + 2 * 3 is treated as 1 + (2 * 3), whereas 1 * 2 + 3 is treated as (1 * 2) + 3 since multiplication has a higher precedence than addition.
Rule of Associativity
When an expression has two operators with the same precedence, the expression is evaluated according to its associativity.
Example :
5+4*2*5%-8+13%-5 5+8*5%-8+13%-5 5+40%-8+13%-5 5+0+3
Output :
8
Precedence of Operator
| Operator | Description | Level | Associativity |
| [] | access array element | ||
| . | access object member | ||
| () | invoke a method | 1 | Left to Right |
| ++ | post-increment | ||
| -- | post-decrement | ||
| ++ | pre-increment | ||
| -- | pre-decrement | ||
| + | unary plus | 2 | Right to Left |
| - | unary minus | ||
| ! | logical NOT | ||
| ~ | bitwise NOT | ||
| () | cast | ||
| new | object creation | 3 | Right to Left |
| * | |||
| / | multiplicative | 4 | Left to Right |
| % | |||
| +- | additive | ||
| + | string concatenation | 5 | Left to Right |
| <<>> | shift | 6 | Left to Right |
| >>> | |||
| < <= | |||
| > >= | relational type comparison | 7 | Left to Right |
| instanceof | |||
| == | equality | 8 | Left to Right |
| != | |||
| & | bitwise AND | 9 | Left to Right |
| ^ | bitwise XOR | 10 | Left to Right |
| | | bitwise OR | 11 | Left to Right |
| && | conditional AND | 12 | Left to Right |
| || | conditional OR | 13 | left to Right |
| ?: | conditional | 14 | Right to Left |
| = += -= | |||
| *= /= %= | assignment | 15 | Right to Left |
| &= ^= |= | conditional AND | 12 | Left to Right |
| <<= >>= >>>= | |||
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