later equals never

[code="java"]package equals;import java.io.File;import java.io.FileWriter;import java.io.BufferedWriter;import java.io.FileReader;import java.io.BufferedReader;import java.io.IOException...

1. Generations for Garbage Collection info: Java objects are created in Heap and Heap is divided into three parts, these are called as Young generation, Tenured or Old Generation and Perm Area. ...

读取properties配置文件如下:[code="java"]package conf;import java.io.InputStream;import java.util.Properties;public class ReadProp { public static void main(String[] args){ String fileName =...

[url]http://blog.youkuaiyun.com/linwei_1029/article/details/7010539[/url]

core class: package com.itreply.oschina;import java.lang.reflect.Field;public class GeneralToString { public static String toString(Object obj) { if(obj == null) return "null";...

1. collection: map/hashmap2. string(like reverse string, stringBuffer...)3. multi-thread4.valatile

[b]1)[/b] String is immutable while StringBuffer and StringBuilder is mutable object.[b]2)[/b] StringBuffer is synchronized while StringBuilder is not which makes StringBuilder faster than StringBuf...

[b]What are transient variables? What role do they play in Serialization process?[/b]The transient keyword in Java is used to indicate that a field should not be serialized. Once the process of de-s...