圣誕樹的錯誤顯示-有解無憂

問題是星星不會形成圣誕樹，它們只是形成一個直角三角形。如何解決？ https://i.imgur.com/vKpxRhP.png <--- 這就是它的樣子。 https://i.imgur.com/eyuccNn.png <--- 這應該是它的樣子。

public static void main(String[] args) throws FileNotFoundException {
    File file = new File("In0103.txt");
    Scanner in = new Scanner(file);
    int maxWidth = in.nextInt();
    int initialWidth = 1;
    int initialLevel = 1;
    int maxLevel = (maxWidth   1) / 2;
    int freeSpace = maxLevel - 1;

    printChristmasTree(initialWidth, initialLevel, maxLevel, freeSpace, null);
}

static void printChristmasTree(int width, int level, int maxLevel, int freeSpace, PrintWriter save) throws FileNotFoundException {
    if (save == null) {
        save = new PrintWriter("Out0103.txt");
    }
    if (level < maxLevel) {
        save.println(Stream.generate(() -> " ").limit(freeSpace).collect(Collectors.joining()));
        save.println(Stream.generate(() -> "*").limit(width).collect(Collectors.joining()));
        save.println();
        printChristmasTree(width = width   2,   level, maxLevel, --freeSpace, save);
    } else {
        save.println(Stream.generate(() -> " ").limit(freeSpace).collect(Collectors.joining()));
        save.println(Stream.generate(() -> "*").limit(width).collect(Collectors.joining()));
        save.close();
    }

}

uj5u.com熱心網友回復：

你幾乎明白了。但是您正在列印freeSpacewithsave.println()但不需要新行，只需save.print(). 此外，還有一個不需要的額外內容save.println()：

public static void main(String[] args) throws FileNotFoundException {
    File file = new File("In0103.txt");
    Scanner in = new Scanner(file);
    int maxWidth = in.nextInt();
    int initialWidth = 1;
    int initialLevel = 1;
    int maxLevel = (maxWidth   1) / 2;
    int freeSpace = maxLevel - 1;

    printChristmasTree(maxWidth, initialWidth, initialLevel, maxLevel, freeSpace, null);
}

static void printChristmasTree(int maxWidth, int width, int level, int maxLevel, int freeSpace, PrintWriter save) throws FileNotFoundException {
    if (save == null) {
        save = new PrintWriter("Out0103.txt");
        save.println("n ="   maxWidth   "");
    }

    if (level < maxLevel) {
        save.print(Stream.generate(() -> " ").limit(freeSpace).collect(Collectors.joining()));
        save.println(Stream.generate(() -> "*").limit(width).collect(Collectors.joining()));
        printChristmasTree(maxWidth, width   2,   level, maxLevel, --freeSpace, save);
    } else {
        save.print(Stream.generate(() -> " ").limit(freeSpace).collect(Collectors.joining()));
        save.println(Stream.generate(() -> "*").limit(width).collect(Collectors.joining()));
        save.close();
    }
}

也許您需要將行從更改int freeSpace = maxLevel - 1;為int freeSpace = maxLevel;，因為您的樹的最后一行似乎有一個可用空間。

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