java

世界知名IT公司的JAVA面试题

类 
String
Integer
Long 
File 
Date
Thread
(java.lang.Thread
Thread类的定义：public class Thread extends Object implements Runnable
)
===========================
包 
java.lang.*;
java.io.*;
java.util.*;
java.sql.*; 
java.math.*; 
=======================
接口:
Comparable 
Collection
Map
List
Runnable(java.lang.Runnable 该接口的定义public interface Runnable)