Programming Tutorials

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Use List, Set, SortedSet, LinkedHashSet, Map, LinkedHashMap in java

By: Saravanan in Java Tutorials on 2010年01月01日 [フレーム]

In this tutorial we can see how to use Collections in java program. Now we can see uses of List, Set, SortedSet, LinkedHashSet, Map, LinkedHashMap.

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import java.util.TreeMap;
import java.util.TreeSet;
public class CollectionExample 
 {
 public static void main(String[] args) 
  {
  List l = new LinkedList();
  l.add("List:angel");
  l.add("schildt");
  l.add("mathew");
  l.add("schildt");
  print(l); 
 
  Set s = new HashSet();
  s.add("set:rose");
  s.add("schildt");
  s.add("mathew");
  s.add("schildt");
  print(s); 
  SortedSet ss = new TreeSet();
  ss.add("set:jasmine");
  ss.add("schildt");
  ss.add("mathew");
  ss.add("schildt");
  print(ss); 
  LinkedHashSet sss = new LinkedHashSet();
  sss.add("set:winslet");
  sss.add("schildt");
  sss.add("mathew");
  sss.add("schildt");
  print(sss); 
  Map m1 = new HashMap();
  m1.put("map", "HashMap");
  m1.put("schildt", "java2");
  m1.put("mathew", "Hyden");
  m1.put("schildt", "java2s");
  print(m1.keySet()); 
  print(m1.values()); 
  SortedMap sm = new TreeMap();
  sm.put("map", "TreeMap");
  sm.put("schildt", "java2");
  sm.put("mathew", "Hyden");
  sm.put("schildt", "java2s");
  print(sm.keySet()); 
  print(sm.values());
 
  LinkedHashMap lm = new LinkedHashMap();
  lm .put("map", "LinkedHashMap");
  lm .put("schildt", "java2");
  lm .put("mathew", "Hyden");
  lm .put("schildt", "java2s");
  print(lm .keySet()); 
  print(lm .values()); 
 }
 static void print(Collection coll) 
 {
  Iterator iter = coll.iterator();
  while (iter.hasNext()) 
  {
   String elem = (String) iter.next();
   System.out.print(elem + " ");
  }
  System.out.println();
 }
}

Output:

List:angel schildt mathew schildt
set:rose schildt mathew
schildt set:jasmine mathew
set:winslet schildt mathew
schildt mathew map
java2 Hyden HashMap
schildt mathew map
java2 Hyden TreeMap
map schildt mathew
LinkedHashMap java2 Hyden

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