SortedSet removeAll() method in Java with Examples
Last Updated :
29 Dec, 2021
The removeAll() method of SortedSet interface is used to remove from this SortedSet all of its elements that are contained in the specified collection.
Syntax:
public boolean removeAll(Collection c)
Parameters: This method takes collection c as a parameter containing elements to be removed from this SortedSet.
Returns Value: This method returns true if this set changed as a result of the call.
Exception: This method throws NullPointerException if this set contains a null element and the specified collection does not permit null elements (optional), or if the specified collection is null.
Note: The removeAll() method in SortedSet is inherited from the Set interface in Java.
Below are the examples to illustrate the removeAll() method.
Example 1:
Java
import java.util.*;
public class GFG1 {
public static void main(String[] args)
throws Exception
{
try {
SortedSet<Integer> set1
= new TreeSet<Integer>();
set1.add( 1 );
set1.add( 2 );
set1.add( 3 );
set1.add( 4 );
set1.add( 5 );
System.out.println(
"Set before "
+ "removeAll() operation : "
+ set1);
SortedSet<Integer> set2
= new TreeSet<Integer>();
set2.add( 1 );
set2.add( 2 );
set2.add( 3 );
System.out.println(
"Collection Elements "
+ "to be removed : "
+ set2);
set1.removeAll(set2);
System.out.println(
"Set after "
+ "removeAll() operation : "
+ set1);
}
catch (NullPointerException e) {
System.out.println("Exception thrown : "
+ e);
}
}
}
|
Output:
Set before removeAll() operation : [1, 2, 3, 4, 5]
Collection Elements to be removed : [1, 2, 3]
Set after removeAll() operation : [4, 5]
Example 2: For NullPointerException.
Java
import java.util.*;
public class GFG1 {
public static void main(String[] args)
throws Exception
{
try {
SortedSet<Integer> set1
= new TreeSet<Integer>();
set1.add( 1 );
set1.add( 2 );
set1.add( 3 );
set1.add( 4 );
set1.add( 5 );
System.out.println(
"Set before "
+ "removeAll() operation : "
+ set1);
SortedSet<Integer> set2 = null ;
System.out.println(
"Collection Elements"
+ " to be removed : "
+ set2);
System.out.println(
"\nTrying to pass "
+ " null as a specified element\n");
set1.removeAll(set2);
System.out.println(
"Set after "
+ "removeAll() operation : "
+ set1);
}
catch (NullPointerException e) {
System.out.println(e);
}
}
}
|
Output:
Set before removeAll() operation : [1, 2, 3, 4, 5]
Collection Elements to be removed : null
Trying to pass null as a specified element
java.lang.NullPointerException
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Set.html#removeAll(java.util.Collection)
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