38.String 是基本数据类型吗?..................................................................................................18
39.static 的用法? .......................................................................................................................18
40.什么是值传递和引用传递? ................................................................................................19
41.重载和重写的区别? ............................................................................................................19
42.成员变量和局部变量的区别有哪些? ................................................................................19
43.静态方法和实例方法有何不同? ........................................................................................19
44.什么是多态? ........................................................................................................................19
45.多态的优点? ........................................................................................................................20
46.多态存在的三个必要条件? ................................................................................................20
47.TreeMap、HashMap、LindedHashMap 的区别? ..............................................................20
48.Java(OOP)面向对象的特征有哪些方面? .....................................................................20
49.列出一些常见的运行时异常? ............................................................................................21
50.什么是反射? ........................................................................................................................21
51.反射的作用? ........................................................................................................................21
52.获取 class 的三种方式?.......................................................................................................21
53.break 和 continue 的区别?...................................................................................................21
54.运行时异常与一般异常有何异同? ....................................................................................21
56.Collection 和 Collections 的区别?.......................................................................................22
57.Error 和 Exception 有什么区别?.........................................................................................22
58.EJB 的生命周期,以及如何管理事务?.............................................................................22
59.Comparable 和 Comparator 接口的区别?...........................................................................22
60.switch 能否作用在 byte、long、string 上?........................................................................22
61.jdk 中哪些类是不能继承的? ..............................................................................................22
62.Set 里的元素是不能重复的,那么用什么方法来区分重复与否呢?.................................23
63.JDK 和 JRE 的区别是什么? ...............................................................................................23
64.是否可以在 static 环境中访问非 static 变量?....................................................................23
65.Java 支持多继承么? ............................................................................................................23
66.什么是迭代器(Iterator)? ......................................................................................................23
67.Iterator 和 ListIterator 的区别是什么?- ..............................................................................23
68.Enumeration 接口和 Iterator 接口的区别有哪些? .............................................................24
69.List,Set,Map 是否继承自 Collection 接口? ..........................................................................24
70.字符串常量池到底存在于内存空间的哪里? ....................................................................24
71.Java 中的编译期常量是什么?使用它又什么风险? ........................................................24
72.用哪两种方式来实现集合的排序? ....................................................................................24
73.说出 JDK1.7 中的三个新特性? ..........................................................................................24
74.说出 5 个 JDK1.8 引入的新特性? ......................................................................................24
75.ArrayList 源码分析?............................................................................................................25
76.HashMap 源码分析?............................................................................................................25
77.ConcurrentHashMap 源码分析?..........................................................................................25
二、JavaIO ..........................................................................................................................................26