NetBeans编写Java儿歌代码时指定歌词行重复输出问题如何解决

问题根因 #

你定义的ifYoureHappyVerse方法内部包含了then your face will surely show it这行歌词的输出逻辑，而你在main方法中连续调用了3次该方法，所以这行内容自然会被重复输出3次。

可行修改方案 #

方案1：拆分输出逻辑（推荐） #

把仅需要输出1次的歌词抽到方法外部，单独调用输出，拆分后的代码如下：

public static void main(String[] args) {
    // 三次输出带动作的歌词行
    printActionLine("clap your hands", "(clap clap)");
    printActionLine("clap your hands", "(clap clap)");
    printActionLine("clap your hands", "(clap clap)");
    // 单独输出仅需展示一次的结尾歌词
    System.out.println("If you're happy and you know it, then your face will surely show it");
}

// 封装动作行的输出逻辑
public static void printActionLine(String action, String sound) {
    System.out.println("If you're happy and you know it, " + action + sound);
}

方案2：新增参数控制输出逻辑 #

如果不想拆分原有方法，可以新增布尔参数控制是否输出结尾歌词：

public static void main(String[] args) {
    ifYoureHappyVerse("clap your hands", "(clap clap)", false);
    ifYoureHappyVerse("clap your hands", "(clap clap)", false);
    // 最后一次调用时再输出结尾行
    ifYoureHappyVerse("clap your hands", "(clap clap)", true);
}

public static void ifYoureHappyVerse(String action, String sound, boolean showEndLine) {
    System.out.println("If you're happy and you know it, " + action + sound);
    if (showEndLine) {
        System.out.println("If you're happy and you know it, then your face will surely show it");
    }
}

注：原代码中System.out.println语句末尾缺少分号，修改时记得补上避免编译报错。

内容的提问来源于stack exchange，提问作者Pain