yangfengby的专栏

【学习笔记】ThreadLocal 1.ThreadLocal主要的API public class ThreadLocal { protected T initialValue();  public T get(); public void set(T value); public void remove();}

1、一个类只包含私有的构造方法，不能被继承 public class Father { private Father() { } } public class Child extends Father { } 编译器提示：Implicit super constructor Father() is not visible for default constructor. Mu