Linked HashSet to an array in Java Program

Basic Linked HashSet Operations

package com.java2novice.linkedhashset;

import java.util.LinkedHashSet;

public class MyLkdHashSetOperations

{

public static void main(String a[])

{

        LinkedHashSet lhs = new LinkedHashSet();

        lhs.add("first");

        lhs.add("second");

        lhs.add("third");

        System.out.println(lhs);

        System.out.println("LinkedHashSet size: "+lhs.size());

        System.out.println("Is LinkedHashSet emplty? : "+lhs.isEmpty());

    }

}

How to delete all elements from Linked HashSet

package com.java2novice.linkedhashset;

import java.util.LinkedHashSet;

public class MyLinkedHashSetClear

{

public static void main(String a[])

{

        LinkedHashSet lhs = new LinkedHashSet();

        lhs.add("first");

        lhs.add("second");

        lhs.add("third");

        System.out.println("My LinkedHashSet content:");

        System.out.println(lhs);

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

        lhs.clear();

        System.out.println("Content After clear:");

        System.out.println(lhs);

    }

}

How to add another collection to Linked HashSet

package com.java2novice.linkedhashset;

import java.util.HashSet;

import java.util.LinkedHashSet;

public class MyLhsAddAllEx

{

public static void main(String a[])

{

        LinkedHashSet lhs = new LinkedHashSet();

        lhs.add("first");

        lhs.add("second");

        lhs.add("third");

        System.out.println(lhs);

        HashSet subSet = new HashSet();

        subSet.add("s1");

        subSet.add("s2");

        lhs.addAll(subSet);

        System.out.println("LinkedHashSet content after adding another collection:");

        System.out.println(lhs);

    }

}

How to iterate through Linked HashSet

package com.java2novice.linkedhashset;

import java.util.Iterator;

import java.util.LinkedHashSet;

public class MyLhsIterateEx

{

public static void main(String a[])

{

        LinkedHashSet lhs = new LinkedHashSet();

        lhs.add("first");

        lhs.add("second");

        lhs.add("third");

        Iterator itr = lhs.iterator();

        while(itr.hasNext())

       {

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

        }

    }

}

How to compare two Linked HashSet and retain elements which are same on both Linked HashSet

package com.java2novice.linkedhashset;

import java.util.LinkedHashSet;

public class MyLhsRetainEx

{

public static void main(String a[])

{

        LinkedHashSet lhs = new LinkedHashSet();

        lhs.add("first");

        lhs.add("second");

        lhs.add("third");

        lhs.add("apple");

        lhs.add("rat");

        System.out.println(lhs);

        LinkedHashSet subSet = new LinkedHashSet();

        subSet.add("rat");

        subSet.add("second");

        subSet.add("first");

        lhs.retainAll(subSet);

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

        System.out.println(lhs);

    }

}

How to copy content of Linked HashSet to an array

package com.java2novice.linkedhashset;

import java.util.LinkedHashSet;

public class MyLhsToArrayEx

{

public static void main(String a[])

{

        LinkedHashSet lhs = new LinkedHashSet();

        lhs.add("first");

        lhs.add("second");

        lhs.add("third");

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

        System.out.println(lhs);

        String[] strArr = new String[lhs.size()];

        lhs.toArray(strArr);

        System.out.println("Copied array content:");

        for(String str:strArr)

        {

            System.out.println(str);

        }

    }

}