Program
import java.util.LinkedHashSet;
public class LinkedHashSetExample {
public static void main(String args[]) {
LinkedHashSet<String> set = new LinkedHashSet<String>();
set.add("Welcome");
set.add("To");
set.add("tamilnadu");
System.out.println("LinkedHashSet: " + set);
// contains(Object o)
System.out.println("\nDoes the Set contains 'tamilnadu'? " + set.contains("tamilnadu"));
System.out.println("\nDoes the Set contains '4'? " + set.contains("4"));
//size()
System.out.println("\nThe size of the set is: "+ set.size());
//isEmpty()
System.out.println("\nIs the set empty: " + set.isEmpty());
// remove(Object o)
set.remove("Welcome");
set.remove("To");
System.out.println("\nLinkedHashSet after removing elements: " + set);
//clear()
set.clear();
System.out.println("\nIs the set empty after clearing: " + set.isEmpty());
}
}Output
LinkedHashSet: [Welcome, To, tamilnadu] Does the Set contains 'tamilnadu'? true Does the Set contains '4'? false The size of the set is: 3 Is the set empty: false LinkedHashSet after removing elements: [tamilnadu] Is the set empty after clearing: true
Description
public boolean contains(Object o)
Returns true if this set contains the specified element. More formally, returns true if and only if this set contains an element e such that Objects.equals(o, e).
Specified by:
contains in interface Collection<E>
Specified by:
contains in interface Set<E>
Overrides:
contains in class AbstractCollection<E>
Parameters:
o – element whose presence in this set is to be tested
Returns:
true if this set contains the specified element
public int size()
Returns the number of elements in this set (its cardinality).
Specified by:
size in interface Collection<E>
Specified by:
size in interface Set<E>
Returns:
the number of elements in this set (its cardinality)
public boolean isEmpty()
Returns true if this set contains no elements.
Specified by:
isEmpty in interface Collection<E>
Specified by:
isEmpty in interface Set<E>
Overrides:
isEmpty in class AbstractCollection<E>
Returns:
true if this set contains no elements
public boolean remove(Object o)
Removes the specified element from this set if it is present. More formally, removes an element e such that Objects.equals(o, e), if this set contains such an element. Returns true if this set contained the element (or equivalently, if this set changed as a result of the call). (This set will not contain the element once the call returns.)
Specified by:
remove in interface Collection<E>
Specified by:
remove in interface Set<E>
Overrides:
remove in class AbstractCollection<E>
Parameters:
o – object to be removed from this set, if present
Returns:
true if the set contained the specified element
public void clear()
Removes all of the elements from this set. The set will be empty after this call returns.
Specified by:
clear in interface Collection<E>
Specified by:
clear in interface Set<E>
Overrides:
clear in class AbstractCollection<E>
