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In this section we will learn about **Operator** **Precedence **and** Operator Associativity***. *

## Operator Precedence

*Precedence *decides which operator will be evaluated first in a case where more than one operator is present in the same calculation.

Operators | Precedence(High to Low) |
---|---|

postfix | expr++ expr— |

unary | ++expr —expr +expr –expr ~ ! |

multiplicative | * / % |

additive | + – |

shift | << >> >>> |

relational | < > <= >= instanceof |

equality | == != |

bitwise AND | & |

bitwise exclusive OR | ^ |

bitwise inclusive OR | | |

logical AND | && |

logical OR | || |

ternary | ? : |

assignment | = += -= *= /= %= &= ^= |= <<= >>= >>>= |

## Example of Precedence

/* * Here we will see the effect of precedence in operators life */ class OperatorPrecedenceExample { public static void main(String args[]) { int i = 40; int j = 80; int k = 40; int l = i + j / k; /* * In above calculation we are not using any bracket. So which operator * will be evaluated first is decided by Precedence. As precedence of * divison(/) is higher then plus(+) as per above table so divison will * be evaluated first and then plus. * * So the output will be 42. */ System.out.println("value of L :" + l); int m = (i + j) / k; /* * In above calculation brackets are used so precedence will not come in * picture and plus(+) will be evaluated first and then divison()/. So * output will be 3 */ System.out.println("Value of M:" + m); } }

## Operator Associativity

If two operators have the same precedence in the calculation then * Associativity* of the operators will be used to decide which operator will be executed first.

## Example of Associativity

package jbt.bean; /* * Here we will see the effect of precedence in operators life */ public class OperatorAssociativityExample { public static void main(String args[]) { int i = 40; int j = 80; int k = 40; int l = i / k * 2 + j; /* * In above calculation we are not using any bracket. And there are two * operator of same precedence(divion and multiplication) so which * operator(/ or *) will be evaluated first is decided by association. * Associativity of * & / is left to right. So divison will be evaluated * first then multiplication. * * So the output will be 82. */ System.out.println("value of L :" + l); int m = i / (k * 2) + j; /* * In above calculation brackets are used so associativity will not come * in picture and multiply(*) will be evaluated first and then * divison()/. So output will be 80 */ System.out.println("Value of M:" + m); } }

## Operators in Java

Let us discuss each operator individually.

Assignment (=) and Arithmetic operators(+, -, *, /) work the same way as they do in other programming languages, so we will not discuss them here. The precedence for ‘**/**‘ and ‘*****‘ operators is higher than sum(**+**) or minus(**–**) or modular division(**%**)

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Could you please explain to me the following expression

int m=i/(k*2)+j;

(precedence doesn’t come into action and that is understood)

While evaluating the expression this is what happens(40/(40*2)+80)=(40/(80)+80)==(1+80)==81

Always the (/) is considered to give us the quotient.

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m = i / (k * 2) + j;

there m=80 is incorrect.

Value will be 80 only. Please check once again.

m = i / (k * 2) + j;

there m=80 is incorrect.

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