What do two vertical lines mean in java

The two vertical bars (||) in Java represent the logical OR operator, which is used to connect two Boolean expressions and return a Boolean result. According to the rules, if both expressions are true, or one of them is true, the result is true; only if both expressions are false, the result is false. This operator is used to check whether multiple conditions are met, compute the union of two Boolean expressions, or determine whether an expression is true or false.

Two vertical bars in Java: Logical OR operator in Java

In the Java programming language , two vertical bars (||) represent the logical OR operator. It is used to concatenate two Boolean expressions and return a Boolean result.

Operation method:

The logical OR operator evaluates two Boolean expressions respectively, and then returns the result according to the following rules:

• If both expressions are true, the result is true.
• If one of the two expressions is true, the result is true.
• The result will be false only if both expressions are false.

Syntax:

<code class="java">布尔表达式1 || 布尔表达式2</code>

Example:

<code class="java">boolean a = true;
boolean b = false;

boolean result = a || b; // 结果为true
result = b || a; // 结果为true
result = b || b; // 结果为false</code>

Usage:

Logical OR operators are very useful in various scenarios, such as:

• Checking whether multiple conditions are met.
• Computes the union of two Boolean expressions.
• Determine whether the expression is true or false.

Comparison with the logical AND operator:

The logical OR operator is different from the logical AND operator (&&), after or returns true only if both expressions are true.

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