LinkedHashSet( Collection c )

public LinkedHashSet(Collection<? extends E> c)

Constructs a new linked hash set with the same elements as the specified collection. The linked hash set is created with an initial capacity sufficient to hold the elements in the specified collection and the default load factor (0.75).

import java.util.*;

class LinkedHashSetConstructor4{
 public static void main(String args[]){
  LinkedHashSet<Integer> lnkHashSet;
  ArrayList<Integer> arrayList;
  
  arrayList = new ArrayList<> ();
  
  /* Add Elements to arrayList */
  arrayList.add(10);
  arrayList.add(50);
  arrayList.add(-33);
  arrayList.add(987);
  arrayList.add(1);
  arrayList.add(-76);
  
  lnkHashSet = new LinkedHashSet<> (arrayList);
  
  System.out.println("Elements in arrayList");
  System.out.println(arrayList);
  
  System.out.println("Elements in lnkHashSet");
  System.out.println(lnkHashSet);
 }
}

Output

Elements in arrayList
[10, 50, -33, 987, 1, -76]
Elements in lnkHashSet
[10, 50, -33, 987, 1, -76]

1. throws NullPointerException if the specified collection is null

import java.util.*;

class LinkedHashSetConstructor4NullPointer{
 public static void main(String args[]){
 
  LinkedHashSet<Integer> lnkHashSet;
  ArrayList<Integer> arrayList=null;

  lnkHashSet = new LinkedHashSet<> (arrayList);
 }
}

Output

Exception in thread "main" java.lang.NullPointerException
        at java.util.LinkedHashSet.<init>(LinkedHashSet.java:168)
        at LinkedHashSetConstructor4NullPointer.main(LinkedHashSetConstructor4NullPointer.java:9)

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