java中常用的类,包,接口___已看

类
String
Integer
Long
File
Date
Thread
(https://www.wendangku.net/doc/fb13749228.html,ng.Thread
Thread类的定义：public class Thread extends Object implements Runnable
)
===========================
包
https://www.wendangku.net/doc/fb13749228.html,ng.*;
java.io.*;
java.util.*;
java.sql.*;
java.math.*;
=======================
接口:
Comparable
Collection
Map
List
Runnable(https://www.wendangku.net/doc/fb13749228.html,ng.Runnable 该接口的定义public interface Runnable)