How to use case in java

The switch-case statement in Java is a control flow statement used to execute different blocks of code based on the value of an expression. Its syntax is: switch (expression) { case value1: // Execute code break; ... default: // Execute code}. Can be used to execute different blocks of code based on the value of an expression, such as menu selections or file extension handling. The advantages include readability and maintainability, but the disadvantages are that it may lead to code redundancy and missing values ​​leading to undefined behavior.

Switch-case statement in Java

What is switch-case statement?

The switch-case statement is a control flow statement used to execute different blocks of code based on the value of an expression.

Syntax:

<code class="java">switch (expression) {
    case value1:
        // 执行当表达式的值为 value1 时的代码
        break;
    case value2:
        // 执行当表达式的值为 value2 时的代码
        break;
    ...
    default:
        // 执行当表达式的值与任何 case 不匹配时的代码
}</code>

Working mechanism:

1. The expression value is compared with the value of each case .
2. If a matching case is found, the code block below the case is executed.
3. If there is no matching case, the default code block is executed.
4. The break statement can be used to explicitly exit a switch statement without executing subsequent cases.

When to use switch-case statements?

When you need to execute different blocks of code based on the value of an expression, you can use the switch-case statement. For example:

• Menu selection
• Process files based on file extension
• Determine behavior based on status value

Advantages:

• High code readability
• Easy to maintain and expand

Disadvantages:

• A large number of case statements may lead to redundant code
• Some values ​​may be missed, resulting in undefined behavior

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