What does ? mean in java?

In Java, the question mark (?) represents the null conditional operator, also known as the ternary conditional operator, which provides a simplified if-else syntax: evaluating the Boolean expression condition. If condition is true, return value1; otherwise, return value2.

? Function in Java

In the Java programming language, the question mark (?) means Null value conditional operator , also known as ternary conditional operator. It is a simplified if-else syntax for evaluating a condition and returning a result in a single statement.

Syntax

##result = (condition) ? value1 : value2;

• condition: Boolean expression to evaluate.
• value1: The value returned if condition is true.
• value2: The value returned if condition is false.

Use the method

? operator to separate condition from two values ​​value1 and value2.
• If condition is true, the ? operator returns value1.
• If condition is false, the ? operator returns value2.

Example

int age = 22;
String result = (age > 18) ? "成年人" : "未成年人";

// result 的值为 "成年人"

Advantages

Using the ? operator has the following advantages:

Simplify code: It can replace complex and nested if-else statements with more concise and readable expressions.
• Improve readability: It helps improve the readability of the code, making it easier for other developers to understand the conditional logic.
• Reduce errors: Since the code is more concise, the possibility of writing errors and logical errors is reduced.

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