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java HashSetÈ¥ÖØÊ¾Àý

import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
public class HashSetDemo {

public static void main(String[] args){
List tableList = new ArrayList();
tableList.add("hello");
tableList.add("hell0");
tableList.add("world");
tableList.add("world");
tableList.add(2);
tableList.add(2);
tableList.add(true);
tableList.add(true);
HashSet hs = new HashSet(tableList);
//System.out.println(hs.toString());
//System.out.println(tableList);
Iterator i = hs.iterator();
while(i.hasNext()){
Object temp = i.next();
System.out.println(temp.toString());
}
}
}
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true
hell0
hello
world


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javaÒì³£»úÖÆ¼òÒª·ÖÎö

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1¡¢±ØÐëÒýÈ룺java.text.SimpleDateFormat
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    SimpleDateFormat sdf=new SimpleDateFormat("yyyyÄêMMÔÂddÈÕ");
     String date=sdf.format(blog.getCreatedTime());
    
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import java.nio.channel.*;   
import java.io.*;   
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