java!What does it mean?

The exclamation point (!) in Java represents a logical NOT operation, used to convert true to false and false to true, applied to Boolean expressions or expressions that can be converted to Boolean values. Has higher precedence than logical AND/OR operators and is used to invert conditions and convert non-zero/zero values ​​to false/true.

java !Meaning

In the Java programming language, the exclamation point (!) operator represents a logical NOT operation, Also called logical negation.

Logical NOT operation

The logical NOT operation operates on a Boolean value and returns its opposite value. In other words, it converts true to false and false to true.

Grammar

The syntax of logical NOT operation is as follows:

!expression

Where:

• expression is a Boolean expression or an expression that can be converted to a Boolean value.

Examples

Here are some examples:

boolean isTrue = true;

// 逻辑非运算
boolean isFalse = !isTrue; // isFalse 为 false

// 应用于表达式
if (!isFalse) {
    // 此代码块将执行，因为 !isFalse 为 true
}

Priority

Logical NOT The operator has higher precedence than the logical AND (&&) and logical OR (||) operators. This means that if an expression contains both the logical NOT operator and the logical AND/OR operator, the logical NOT operator will be executed first.

Usage Scenarios

The logical NOT operator is used in various scenarios, including:

• Convert true to false and vice versa
• Invert Boolean condition
• Convert non-zero values ​​to false and zero values ​​to true (due to boolean type)

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