How to use Switch expressions to handle multiple conditional branches in Java 14

How to use Switch expressions to process multiple conditional branches in Java 14

In programming, we often encounter situations where we need to execute different code blocks based on different conditions. In Java, we usually use the Switch statement to handle such multi-conditional branch situations. However, in Java 14, the new feature of Switch expressions was introduced, which makes the processing of conditional branches more concise and flexible. This article will introduce how to use Switch expressions to process multiple conditional branches in Java 14, and give corresponding code examples.

In versions before Java 14, the Switch statement usually takes the following form:

switch (expression) {
    case value1:
        // 代码块1
        break;
    case value2:
        // 代码块2
        break;
    ...
    default:
        // 默认代码块
}

In Java 14, you can use the new Switch expression to implement the processing of multiple conditional branches. The usage form of Switch expression is:

result = switch (expression) {
    case value1 -> {
        // 代码块1
        yield result1;
    }
    case value2 -> {
        // 代码块2
        yield result2;
    }
    ...
    default -> {
        // 默认代码块
        yield defaultResult;
    }
};

The result of Switch expression can be assigned to a variable, and the result can be returned using the yield keyword. It should be noted that each code block in the Switch expression needs to use the yield keyword to return the result, otherwise an error will be reported.

The following is an example to show how to use Switch expressions to process multiple conditional branches in Java 14.

public class SwitchExpressionExample {
    public static void main(String[] args) {
        String dayOfWeek = "Monday";
        String typeOfDay = switch (dayOfWeek) {
            case "Monday", "Tuesday", "Wednesday", "Thursday", "Friday" -> "Weekday";
            case "Saturday", "Sunday" -> "Weekend";
            default -> throw new IllegalArgumentException("Invalid day of week: " + dayOfWeek);
        };

        System.out.println("Type of day: " + typeOfDay);
    }
}

In the above example, we determine whether it is a working day or a weekend based on the given day of the week, and assign the result to the typeOfDay variable. In the Switch expression, we use the case keyword to define each conditional branch, and use the -> symbol to connect the code block and the result. It should be noted that multiple values ​​can be specified in the case list at the same time, separated by commas.

Run the above code, the output result is:

Type of day: Weekday

Through the above example, we can see that using Switch expressions to process multiple conditional branches in Java 14 is more concise and intuitive. Compared with the traditional Switch statement, the syntax of the Switch expression is more concise, and the result can be directly assigned to a variable, which improves the readability and maintainability of the code.

In addition to the strings representing conditions in the above examples, Switch expressions can also use other data types, such as int, enum, etc. Using Switch expressions makes it easier to handle multiple conditional branches, reducing code redundancy and the possibility of errors. Therefore, when developing Java applications, you can make full use of the functionality of Switch expressions in Java 14 to improve code quality and development efficiency.

In summary, this article introduces how to use Switch expressions to handle multiple conditional branches in Java 14, and demonstrates its use through sample code. Switch expressions make the processing of conditional branches more concise and flexible, and can improve the readability and maintainability of the code. In the actual development process, we can reasonably use Switch expressions to handle different conditional branch situations according to specific needs.

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