The role of case in java

In Java, the case keyword is used to specify the condition of the code block to be executed in the switch statement. The executed code block is determined by matching the constant value corresponding to the condition and the expression in the switch statement. If If there is no matching case, you can specify a default code block to handle the mismatch.

The role of case in Java

In Java, case is A keyword in a switch statement that specifies the block of code to be executed. It is used with the switch statement to execute different blocks of code based on given conditions.

Detailed explanation of the function

• Specify the condition: case followed by a constant value indicating the code to be executed The conditions corresponding to the block.
• Matching conditions: When the expression in the switch statement matches the constant value after case, the code block will be executed.
• Code block: Code block contains the statements to be executed. These statements will be executed when the conditions match.
• Default behavior: If there is no matching case, you can specify a default block that will be used in the expression with any case Executed when there is no match.

Example

switch (dayOfWeek) {
    case "Monday":
        System.out.println("今天是星期一");
        break;
    case "Tuesday":
        System.out.println("今天是星期二");
        break;
    default:
        System.out.println("无效的星期");
}

In this example:

• switch statement based on dayOfWeek Judge the value of the variable. The
• case clause specifies the different days of the week, and the block of code to be executed.
• If dayOfWeek is "Monday", execute the "Today is Monday" code block.
• If dayOfWeek is "Tuesday", execute the "Today is Tuesday" code block.
• If dayOfWeek is not "Monday" or "Tuesday", the default code block for "invalid weekday" is executed.

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