java?:what does it mean

Java's ? : operator is a ternary operator that selects one of two values ​​based on a conditional expression: if the conditional expression is true, the value 1 is returned. If the conditional expression is false, a value of 2 is returned. It is a concise if-else statement used to select values ​​based on conditions, and can be nested to implement more complex conditional selections.

In Java? : Operator

in Java? : Operator is A ternary operator that selects one of two values ​​at run time based on a conditional expression. The syntax is as follows:

(条件表达式) ? 值1 : 值2;

Meaning:

? : The operator compares the evaluation result of a conditional expression with two values:

• If the conditional expression is true, then value 1 is returned.
• If the conditional expression is false, then value 2 is returned.

Working principle:

? : operator can be seen as a simplified if-else statement. It evaluates the conditional expression, value 1, and value 2 as a whole expression.

Example:

int number = 10;
int result = (number > 5) ? 100 : 200; // result = 100

Explanation:

##Conditional expression
• number > 5 is true.
Thus, the
• ? : operator returns the value 1, which is 100.

Features:

• ? The : operator provides a concise way to select values ​​based on conditions.
It has the same function as the
• if-else statement, but is more concise and reduces the number of lines of code.
• ? : Operators can be nested to achieve more complex condition selection.

Note:

The conditional expression must be a Boolean expression (
• true or false).
• ? : The value returned by the operator must be compatible with the types of value1 and value2.

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