编写一个程序，判断一个字符串是否是合法的Java标识符；
//create string
import java.util.regex.*;
public class Split {
public static void main (String[] args) {
Pattern pattern = Pattern.compile("[,]");
String[] arrStr = pattern.split("abstract,break,byte,boolean,catch,case,class,char,continue,default,double,do,else,extends,false,final,float,for,finally,if,import,implements,int,interface,instanceof,long,length,native,new,null,package,private,protected,public,return,switch,synchronized,short,static,super,try,true,this,throw,throws,threadsafe,transient,void,while");
int length = arrStr.length;
for(int i=0; i<length; ++i) {
System.out.print("\"" + arrStr[i] + "\"" + ",");
}
System.out.println();
}
}
import java.util.*;
public class RE {
public static void main (String[] args) {
String[] keyword = new String[] {"abstract","break","byte","boolean","catch","case","class","char","continue","default","double","do","else","extends","false","final","float","for","finally","if","import","implements","int","interface","instanceof","long","length","native","new","null","package","private","protected","public","return","switch","synchronized","short","static","super","try","true","this","throw","throws","threadsafe","transient","void","while"};
Scanner in = new Scanner(System.in);
p("Input String:");
String
从jdk1.5开始，Java中开始支持范型了。范型是一个很有用的编程工具，给我们带来了极大的灵活性。在看了《java核心编程》之后，我小有收获，写出来与大家分享。
所谓范型，我的感觉就是，不用考虑对象的具体类型，就可以对对象进行一定的操作，对任何对象都� ......
在项目中经常会遇到使用CSV文件，比如从HR中得到的文件拿到其它地方去处理，实际会需要得到当前和上次文件中的差异，比如：添加，删除，修改， 那么如何来实现呢，可能有很的方法，在这里我说一下我的实现方法而且已投入实际使用。
首先， CSV文件典型以,分隔，当然还有其它的字符，由很多列的属性和属性值组成，那么两个� ......
