Maven 主线：坐标、生命周期与依赖范围

import java.util.*;
public class Main {
    enum Scope { COMPILE, PROVIDED, RUNTIME, TEST }
    enum Use { MAIN_COMPILE, MAIN_RUNTIME, TEST_COMPILE }
    record Dependency(String name, Scope scope) {}
    static List<String> visible(List<Dependency> deps, Use use) {
        Set<String> seen = new HashSet<>();
        List<String> result = new ArrayList<>();
        for (Dependency d : deps) {
            if (d.name() == null || d.name().isBlank() || d.scope() == null)
                throw new IllegalArgumentException("invalid");
            // 重复声明直接拒绝，不覆盖已有配置。
            if (!seen.add(d.name())) throw new IllegalArgumentException("duplicate");
            boolean allowed = switch (use) {
                case MAIN_COMPILE -> d.scope() == Scope.COMPILE || d.scope() == Scope.PROVIDED;
                case MAIN_RUNTIME -> d.scope() == Scope.COMPILE || d.scope() == Scope.RUNTIME;
                // 这四种直接依赖均参与测试编译类路径。
                case TEST_COMPILE -> true;
            };
            if (allowed) result.add(d.name());
        }
        // 只排序新结果，保持输入不变。
        Collections.sort(result);
        return List.copyOf(result);
    }
    static void eq(Object expected, Object actual) {
        if (!Objects.equals(expected, actual)) throw new AssertionError(actual);
    }
    public static void main(String[] args) {
        List<Dependency> deps = List.of(new Dependency("api",Scope.COMPILE),
            new Dependency("driver",Scope.RUNTIME),new Dependency("junit",Scope.TEST),
            new Dependency("servlet",Scope.PROVIDED));
        eq(List.of("api","servlet"),visible(deps,Use.MAIN_COMPILE));
        eq(List.of("api","driver"),visible(deps,Use.MAIN_RUNTIME));
        eq(List.of("api","driver","junit","servlet"),visible(deps,Use.TEST_COMPILE));
        eq(List.of(),visible(List.of(),Use.MAIN_RUNTIME));
        try {
            visible(List.of(deps.get(0),deps.get(0)),Use.MAIN_COMPILE);
            throw new AssertionError("duplicate");
        } catch (IllegalArgumentException expected) {}
        System.out.println("PASS 5 dependency scope tests");
    }
}