Java Hashmap Pro

Simple Java Linked Hash Map

import java.util.LinkedHashMap;

public class JavaLinkedHashMapExample

{

public static void main(String[] args)

{

LinkedHashMap lHashMap = new LinkedHashMap();

lHashMap.put("One", new Integer(1));

lHashMap.put("Two", new Integer(2));

Object obj = lHashMap.get("One");

System.out.println(obj);  

    }

}

Check if a particular element exists in Java Linked Hash Set

import java.util.LinkedHashSet;

public class CheckElementLinkedHashSetExample

{

public static void main(String[] args)

{

LinkedHashSet lhashSet = new LinkedHashSet();

lhashSet.add(new Integer("1"));

lhashSet.add(new Integer("2"));

lhashSet.add(new Integer("3"));

boolean blnExists = lhashSet.contains(new Integer("3"));

System.out.println("3 exists in LinkedHashSet ? : " + blnExists);

   }

}

Copy all elements of Java Linked Hash Set to an Object Array

import java.util.LinkedHashSet;  

public class CopyElementsOfHashSetToArrayExample

{

public static void main(String[] args)

{

LinkedHashSet lhashSet = new LinkedHashSet();

lhashSet.add(new Integer("1"));

lhashSet.add(new Integer("2"));

lhashSet.add(new Integer("3"));

Object[] objArray = lhashSet.toArray();

System.out.println("LinkedHashSet elements are copied into an Array.

Now Array Contains..");

for(int index=0; index < objArray.length ; index++)

System.out.println(objArray[index]);

    }

}

Get Size of Java Linked Hash Set

import java.util.LinkedHashSet;  

public class GetSizeOfJavaLinkedHashSetExample

{

public static void main(String[] args)

{

LinkedHashSet lhashSet = new LinkedHashSet();System.out.println("Size of LinkedHashSet : " + lhashSet.size());

lhashSet.add(new Integer("1"));

lhashSet.add(new Integer("2"));

lhashSet.add(new Integer("3"));

System.out.println("Size of LinkedHashSet after addition : " + lhashSet.size());

lhashSet.remove(new Integer("1"));

System.out.println("Size of LinkedHashSet after removal : " + lhashSet.size());

    }

}

Iterate through elements of Java Linked Hash Set

import java.util.LinkedHashSet;

import java.util.Iterator;

public class IterateThroughElementsOfLinkedHashSetExample

{

public static void main(String[] args)

{

LinkedHashSet lhashSet = new LinkedHashSet();

lhashSet.add(new Integer("1"));

lhashSet.add(new Integer("2"));

lhashSet.add(new Integer("3"));

Iterator itr = lhashSet.iterator();

System.out.println("LinkedHashSet contains : ");

while(itr.hasNext())

System.out.println(itr.next());

   }

}

Remove all elements from Java Linked Hash Set

import java.util.LinkedHashSet;

public class RemoveAllElementsFromLinkedHashSetExample

{

public static void main(String[] args)

{

LinkedHashSet lhashSet = new LinkedHashSet();

lhashSet.add(new Integer("1"));

lhashSet.add(new Integer("2"));

lhashSet.add(new Integer("3"));   

System.out.println("LinkedHashSet before removal : " + lhashSet);

lhashSet.clear();

System.out.println("LinkedHashSet after removal : " + lhashSet);

System.out.println("Is LinkedHashSet empty ? " + lhashSet.isEmpty());    

    }

}

Remove specified element from Java Linked Hash Set

import java.util.LinkedHashSet;

public class RemoveSpecifiedElementFromLinkedHashSetExample

{  

public static void main(String[] args)

{

LinkedHashSet lhashSet = new LinkedHashSet();

lhashSet.add(new Integer("1"));

lhashSet.add(new Integer("2"));

lhashSet.add(new Integer("3"));

System.out.println("LinkedHashSet before removal : " + lhashSet);

boolean blnRemoved = lhashSet.remove(new Integer("2"));

System.out.println("Was 2 removed from LinkedHashSet ? " + blnRemoved);

System.out.println("LinkedHashSet after removal : " + lhashSet);

   }

}