使用一个枚举：
public enum Foo {
INSTANCE;
}
实现可序列化单例的正确方法
public enum Elvis {
INSTANCE;
private final String[] favoriteSongs =
{ "Hound Dog", "Heartbreak Hotel" };
public void printFavorites() {
System.out.println(Arrays.toString(favoriteSongs));
}
}
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