Java Switch如何與其他控制結構結合

在Java中，switch語句可以與其他控制結構（如if-else、for、while和do-while）結合使用，以實現更復雜的邏輯。以下是一些示例：

1. switch與if-else結合：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a number between 1 and 3: ");
        int num = scanner.nextInt();

        switch (num) {
            case 1:
                System.out.println("You entered 1.");
                break;
            case 2:
                System.out.println("You entered 2.");
                break;
            default:
                if (num < 1 || num > 3) {
                    System.out.println("Invalid number. Please enter a number between 1 and 3.");
                }
        }
    }
}

2. switch與for結合：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a character: ");
        char ch = scanner.next().charAt(0);

        for (int i = 0; i < 5; i++) {
            switch (ch) {
                case 'a':
                case 'e':
                case 'i':
                case 'o':
                case 'u':
                    System.out.println(ch + " is a vowel.");
                    break;
                default:
                    System.out.println(ch + " is a consonant.");
            }
        }
    }
}

3. switch與while結合：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a number between 1 and 5: ");
        int num = scanner.nextInt();

        while (num > 0) {
            switch (num) {
                case 1:
                    System.out.println("You entered 1.");
                    break;
                case 2:
                    System.out.println("You entered 2.");
                    break;
                case 3:
                    System.out.println("You entered 3.");
                    break;
                case 4:
                    System.out.println("You entered 4.");
                    break;
                case 5:
                    System.out.println("You entered 5.");
                    break;
                default:
                    System.out.println("Invalid number. Please enter a number between 1 and 5.");
            }
            num--;
        }
    }
}

這些示例展示了如何在Java中將switch語句與其他控制結構結合使用。根據需要，您可以根據自己的需求組合不同的控制結構。