How to Use Logical Operators in Java

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Instructions

Use the AND Operator

1

Use the AND operator, whose symbol is &&. In Java, && evaluates to true if and only if both of its operands -- the objects being manipulated -- evaluate to true.
2

Understand that its operands can be any expression that evaluates to a boolean value.
3

Note that this includes any comparison operator, such as greater than >, less than < or equal to ==, any method that returns a boolean or any boolean variable itself. Given "int a = 7; int b = 10;" then "a > 4 && b < 20" will evaluate to true.

Use the OR and NOT Operators

1

Use the OR operator, whose symbol is ||. It evaluates to true if either or both of its operands evaluate to true. The operands can be any expression that evaluates to a boolean. If we have "int a = 10;int b = 40;" then "a == 7 || b > a" will be true. Even though the first operand evaluates to false, the second will evaluate to true.
2

Consider using the exclusive OR operator, or XOR, whose symbol is ^. It evaluates to true if either but not both of its operands evaluates to true. Here the XOR operator is used as a logical boolean operator. Suppose "int a = 7;int b = 10;" then "b > a ^ b == 10". This will evaluate to false since both operands are true.
3

Reverse the result of a boolean expression in Java by using the logical NOT operator NOT, whose symbol is !. If its operand is true, the NOT expression will evaluate to false.
4

Use the NOT operator with parentheses and another boolean expression since the NOT operator binds very tightly (its operator precedence is very high). The exception is if it's paired with a single boolean variable. This example demonstrates the usage of the boolean NOT operator:

Given "int a = 7; int b = 10;" then "!(a == b)" will evaluate to true since a == b will be false, and the NOT operator will reverse it.
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