AbstractList lastIndexOf() method in Java with Examples
Last Updated :
21 Nov, 2019
The lastIndexOf() method of java.util.AbstractList class is used to return the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element. More formally, returns the highest index i such that (o==null ? get(i)==null : o.equals(get(i))), or -1 if there is no such index.
Syntax:
public int lastIndexOf(Object o)
Parameters: This method takes Object o as a parameter which is the element to search for.
Returns Value: This method returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
Exception: This method throws NullPointerException if the specified element is null and this list does not permit null elements.
Below are the examples to illustrate the lastIndexOf() method.
Example 1:
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
AbstractList<String>
arrlist1 = new ArrayList<String>();
arrlist1.add( "A" );
arrlist1.add( "B" );
arrlist1.add( "A" );
arrlist1.add( "B" );
arrlist1.add( "E" );
System.out.println( "ArrayList : "
+ arrlist1);
int lastindex = arrlist1.lastIndexOf( "A" );
System.out.println( "Last index of A : "
+ lastindex);
}
catch (NullPointerException e) {
System.out.println( "Exception thrown : " + e);
}
}
}
|
Output:
ArrayList : [A, B, A, B, E]
Last index of A : 2
Example 2:
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
throws Exception
{
try {
AbstractList<String> arrlist1 = null ;
System.out.println( "ArrayList : "
+ arrlist1);
System.out.println( "\nTrying to get"
+ " the index from"
+ " null ArrayList" );
int lastindex = arrlist1.lastIndexOf( "B" );
System.out.println( "Last index of B : "
+ lastindex);
}
catch (NullPointerException e) {
System.out.println( "Exception thrown : " + e);
}
}
}
|
Output:
ArrayList : null
Trying to get the index from null ArrayList
Exception thrown : java.lang.NullPointerException
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