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abbreviated code »º³å´æ´¢Æ÷
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´úÂëÈçÏ£ºimport java.io.*;
public class MainHT {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
if (args.length == 1) {
MainHT mainHT = new MainHT();
mainHT.ReadFile(args[0]);
}
else{
System.out.println("Usage fileName");
}
}
public void ReadFile(String fileNameandPath)
{
String record = null;
int recCount = 0;
try {
FileReader fr = new FileReader(fileNameandPath);
BufferedReader br = new BufferedReader(fr);
record = new String();
FileWriter fw1 = new FileWriter("one.txt");
PrintWriter pw1= new PrintWriter(fw1);
FileWriter fw2 = new FileWriter("two.txt");
PrintWriter pw2= new PrintWriter(fw2);
while ((record = br.readLine()) != null) {
recCount++;
System.out.print
Ïà¹ØÎĵµ£º
StringתCharacterÊý×飬ÓÃCharacterµÄisDigitºÍisLetterº¯ÊýÈ¥Åжϡ£
public static boolean isNumeric(String str) {
for (int i = str.length(); i = 0;) {
if (!Character.isDigit(str.charAt(i))) {
return false;
}
}
return true;
}
public static boolean isNumeric(String str) {
Pattern patt ......
public class Foo {
static void operate(StringBuffer x,StringBuffer y){
x.append(y);
y=x;
}
public static void main(String args[]){
StringBuffer a = new StringBuffer("A");
StringBuffer b = new StringBuffer("B");
& ......
service = new
Service();
thread=new
Thread(service);
try
{
  ......
ÔÚjavaÖУ¬¼ÙÉèÄãÓÐÒ»¸öuser ¶ÔÏóµÄlist£¬´Ëuser¶ÔÏó·â×°ÁËÓû§µÄid, first name, last name and age. È»ºóÄãÏëµ÷ÓÃÒ»¸öweb service(eg. UserService.deleteUsersByIds(List<Integer> userIds) ȥɾ³ýÊý¾Ý¿âÖÐÖ¸¶¨µÄÕâЩuser¡£ ÌýÆðÀ´Ëƺõ²»Ì«À§ÄÑ£¬²»ÊÇô? ÄãËùÐèÒªÖ»Êǽ« List<User> ת»¯³ÉList&l ......
ÔÚJava concurrent°üÖÐÓÐÕâôһ¸ö½Ó¿Ú£ºConcurrentMap¡£
ConcurrentMap¼Ì³Ð×ÔMap£¬²¢Ìí¼ÓÁ˼¸¸öеÄÔ×Ó·½·¨£º putIfAbsent¡¢remove¡¢replace
Æä·½·¨ÕªÒªÈçÏ£º
V
putIfAbsent(K key, V value)
Èç¹ûÖ¸¶¨¼üÒѾ²»ÔÙÓëij¸öÖµÏà¹ØÁª£¬Ôò½ ......