CodeSprout 官方2026/10/04 00:19

官方解答 · 置頂Java

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CodeSprout 官方解答 · 題意分析、解題步驟與完整參考程式

import java.util.*;

public class Solution {
    private static class Tracked implements AutoCloseable {
        private final String name;
        private final List<String> events;
        private final boolean fail;
        Tracked(String name, List<String> events, boolean fail) {
            this.name=name; this.events=events; this.fail=fail;
            events.add("open:"+name);
        }
        public void close() throws Exception {
            events.add("close:"+name);
            if (fail) throw new Exception("close:"+name);
        }
    }

    public static List<String> solve(boolean bodyFail, boolean closeFail, boolean flag) {
        List<String> events = new ArrayList<>(), messages = new ArrayList<>();
        try (Tracked r0 = new Tracked("R0",events,closeFail && false);
             Tracked r1 = new Tracked("R1",events,closeFail && true);
             Tracked r2 = new Tracked("R2",events,closeFail && false);
             Tracked r3 = new Tracked("R3",events,closeFail && true)) {
            events.add("body");
            if (bodyFail || flag) throw new Exception("body");
        } catch (Exception error) {
            messages.add(error.getMessage());
            events.add("caught:"+error.getMessage());
            for (Throwable suppressed : error.getSuppressed()) {
                messages.add(suppressed.getMessage());
                events.add("suppressed:"+suppressed.getMessage());
            }
        } finally {
            if (messages.isEmpty()) events.add("success");
            events.add("finally");
        }
        return messages;
    }
}