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Operators supported by Java can be categorized into arithmetic, logical, relational, bitwise used for bit manipulation and some special operators.
Please note that some of the expressions in which a variable is present in both sides can be written as:. Consider two operands A and B. A B evaluates to True if any of the two operands is True. Note that any non-zero value is considered True and zero is considered False. Following program shows logical operators in action:. Following program illustrates the behaviour of relational operators:. These operators operate at bit level. Consider two bits bit1 and bit2. The difference is observed in case of negative integers.
You might have noticed that all decimal numbers are represented using 8 bits 1 Octet but in the system memory it is stored as a sequence of multiple octets 4 in case of 32 bit systems. In our case, other 3 octets would be all 0 s. But NOT operation would toggle all those 0 s to 1 s which would result into a very high value outside the range of int.
As a result, some unexpected value would be displayed. It can be useful in knowing the actual class of an object when we are using inheritance , a feature which we will discuss later in the tutorial. Higher precedence operators will be evaluated first. Associativity determines whether an expression is evaluated left to right or right to left. Consider the expressions below:.
Following program demonstrates the behaviour of postfix and prefix operators:. Typecasting Sometimes it is required to explicitly convert a variable from one data type to another.
This concept is known as typecasting. Following program will make it clear. In the above program, both a and b are integers. Now, since x is a float type variable, so x stores 2. Automatic Type Conversion In Java , we can mix variables and constants of different data types in an expression. During evaluation, operands of lower type is automatically converted to higher type.
Following program shows logical operators in action: Following program illustrates the behaviour of relational operators: Special Operators instanceof This operator is applicable to objects only. It checks whether an object is of particular class type. Condition Conditional Operator returns a value depending on a condition. If condition is true, a is returned else b is returned. Assignment It is used to assign one value to other in an expression. Following program illustrates the use of conditional operator: Consider the expressions below: Following program demonstrates the behaviour of postfix and prefix operators: This operator is applicable to objects only.
Conditional Operator returns a value depending on a condition. It is used to assign one value to other in an expression.