Java不能在Ubuntu上编译，但可以在Windows上编译

我有个问题。在我的 Windows 桌面上，我运行了一个 java 文件，没有任何错误。我用 java sdk 版本运行它：15.0.2。现在我有我想在我的 ubuntu 机器上运行的相同文件，但是当我尝试：时
javac Test.java，它给了我以下错误：

Test.java:16: error: illegal start of expression
        return switch (unit) {
               ^
Test.java:17: error: : expected
            case "m" -> 60L * Integer.parseInt(quantity);
                    ^
Test.java:17: error: illegal start of expression
            case "m" -> 60L * Integer.parseInt(quantity);
                     ^
Test.java:18: error: : expected
            case "h" -> 60L * 60 * Integer.parseInt(quantity);
                    ^
Test.java:18: error: illegal start of expression
            case "h" -> 60L * 60 * Integer.parseInt(quantity);
                     ^
Test.java:19: error: : expected
            case "d" -> 60L * 60 * 24 * Integer.parseInt(quantity);
                    ^
Test.java:19: error: illegal start of expression
            case "d" -> 60L * 60 * 24 * Integer.parseInt(quantity);
                     ^
Test.java:20: error: : expected
            default -> 0;
                   ^
Test.java:20: error: illegal start of expression
            default -> 0;
                    ^
9 errors

这是完整的代码Test.java：

package com.company.drivers;

public class Test {

    public static void main(String[] args) {

        System.out.println(getPeriodMultiplierSecs("15m"));
        
    }


    public static long getPeriodMultiplierSecs(String period) {
        String quantity = period.substring(0, period.length() - 1);
        String unit = period.substring(period.length() - 1);

        return switch (unit) {
            case "m" -> 60L * Integer.parseInt(quantity);
            case "h" -> 60L * 60 * Integer.parseInt(quantity);
            case "d" -> 60L * 60 * 24 * Integer.parseInt(quantity);
            default -> 0;
        };
    }
}

java ubuntu 版本是11.0.10. 为什么我会在 ubuntu 上收到这些错误，我该如何解决？

回答

int v;
switch (unit) {
case "m":
    v = 60L * Integer.parseInt(quantity);
    break;
case "h": .... and so on.
}