Singleton就是一个很好的private 构造函数的例子,如下 public class Singleton{ private static Singleton _instance; private Singleton(){ System.out.println("only one instance of this class"); } public static Singleton getInstance(){ if(_instance==null) _instance=new Singleton(); return _instance; } }
public class Singleton{
private static Singleton _instance;
private Singleton(){
System.out.println("only one instance of this class");
}
public static Singleton getInstance(){
if(_instance==null)
_instance=new Singleton();
return _instance;
}
}