What does || mean in java?

The || operator in Java is a logical OR operator that connects two Boolean expressions. If at least one is true, the result is true; if both are false, the result is false.

Meaning of || in Java

In Java, || is a logical OR operator, used for Concatenate two Boolean expressions. Here's how it works:

Syntax:

<code>booleanExpression1 || booleanExpression2</code>

Result:

• If two If all expressions are true, the result is true.
• The result is true if at least one expression is true.
• If both expressions are false, the result is false.

Example:

boolean a = true;
boolean b = false;

System.out.println(a || b); //输出：true
System.out.println(b || a); //输出：true
System.out.println(b || b); //输出：false

Priority:

|| operator has higher precedence than &&( logical AND) operator, which means that if both operators appear at the same time, || will be evaluated first.

Usage scenario:

|| operator is usually used to determine whether at least one of multiple conditions is true. For example:

if (username != null || password != null) {
    // 用户名或密码不为空，执行某项操作
}

Note:

To avoid short-circuit evaluation, use the short-circuit replacement for the || operatorbooleanExpression1 ? true : booleanExpression2 . This ensures that the second expression is always evaluated.

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