What does ?: in java mean?

?: operator (ternary operator) is a conditional operator that selects one of two values based on the result of a Boolean expression. Here's how it works: A conditional expression is evaluated. If the condition is true, value1 is selected, otherwise value2 is selected. This operator is a shortened version of the if-else statement that returns only a single value.

In Java, the meaning of ?: operator

?: operator, also known as triple Meta operator is a conditional operator used to select one of two values based on the result of a conditional expression. The syntax is as follows:

condition ? value1 : value2;

where:

• conditionis a Boolean expression that determines whether to selectvalue1orvalue2.
• value1is the expression to select ifconditionistrue.
• value2is the expression to select ifconditionisfalse.

How it works

?: The operator works through the following steps:

1. First, the conditional expression is evaluated.
2. If the conditional expression istrue, then selectvalue1.
3. If the conditional expression isfalse, selectvalue2.

Example

The following example demonstrates how to use the ?: operator:

int age = 25; String result = age >= 18 ? "成年" : "未成年"; System.out.println(result); // 输出：成年

In this example, the conditional expressionage >= 18istrue, so the ?: operator selectsvalue1, which is "adult".

Note

?: operator is a shortened version of theif-elsestatement, but it can only return a single value. If you need to return complex results based on conditions, you should use theif-elsestatement or theswitch-casestatement.

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