Operators works the same way as mathematics. It also has a precedence. Precedence is kind of a way on who goes to perform first. Like for example the operators +, -, *, /. If we didn't use a parenthesis, * or / will go first before + or -. If you want to know the sequence of precedence of all operators, check the link on the first page. Though, to avoid conflicts, why not just use a parenthesis. A parenthesis has the highest priority of them all anyway.
Note:
In the precedence, the assignment operator is neglected.
Assignment operator ( = )
- Assignment operator is the equal sign in mathematics. It is called assignment since we, normally used this symbol to assign a value in a variable and also this is a better way to avoid confusion with equality operator ( == ).
Arithmetic operators
1. Addition ( + )
2. Subtraction ( - )
3. Multiplication ( * )
4. Division ( / )
5. Remainder ( % )
Note:
There is a remainder operator since division works great in numbers with decimals which is either a float or a double but problem occurs with whole numbers which is an integer.
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int x = 5;
int y = 2;
int z = x / y;
System.out.println(z);
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Result:
2
The result is a whole number 2 and not 2.5 since the data type of 2.5 is either a float or a double.
You can either use a float or double in variable z or you can use the remainder of modulus operator.
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int x = 5;
int y = 2;
int za = 5 / 2;
int zb = 5 % 2;
System.out.println(za + " r " + zb);
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Result:
2 r 1
Other functions of addition operator is to concatenate strings just like in Result above.
Compound assignment
+=, -=, *=, /=, %=
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int x += 5;
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Equivalent:
x = x + 5
Unary Operator
+, -, ++, --, !
These operators are usually use together with a variable.
-( x ) means negative of x
! ( false ) means not false or true
x++ or ++x means x = x + 1
y-- or --y means y = y - 1
Note:
Incrementing (++) or decrementing (--) depends on the placement. If it is before the variable like ++x, the increment will take place right away but if after the variable, the increment will take effect on the invocation of x.
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