Java Guava | Longs.lastIndexOf() method with Examples
Last Updated :
31 Jan, 2019
The lastIndexOf() method of Longs Class in Guava library is used to find the last index of the given long value in a long array. This long value to be searched and the long array in which it is to be searched, both are passed as a parameter to this method. It returns an integer value which is the last index of the specified long value. If the value is not found, it returns -1.
Syntax:
public static int lastIndexOf(long[] array,
long target)
Parameters: This method accepts two mandatory parameters:
- array: which is the array of long values in which the long value is to searched.
- target: which is long value to be searched for last index in the long array.
Return Value: This method returns an integer value which is the last index of the specified long value. If the value is not found, it returns -1.
Below programs illustrates this method:
Example 1:
import com.google.common.primitives.Longs;
import java.util.Arrays;
class GFG {
public static void main(String[] args)
{
long [] arr = { 1 , 2 , 3 , 4 , 3 , 5 , 3 , 4 };
long target = 3 ;
int index
= Longs.lastIndexOf(arr, target);
if (index != - 1 ) {
System.out.println( "Target is present"
+ " at index "
+ index);
}
else {
System.out.println( "Target is not present"
+ " in the array" );
}
}
}
|
Output:
Target is present at index 6
Example 2:
import com.google.common.primitives.Longs;
import java.util.Arrays;
class GFG {
public static void main(String[] args)
{
long [] arr = { 3 , 5 , 7 , 11 , 13 };
long target = 17 ;
int index
= Longs.lastIndexOf(arr, target);
if (index != - 1 ) {
System.out.println( "Target is present"
+ " at index "
+ index);
}
else {
System.out.println( "Target is not present"
+ " in the array" );
}
}
}
|
Output:
Target is not present in the array
Reference: https://google.github.io/guava/releases/21.0/api/docs/com/google/common/primitives/Longs.html#lastIndexOf-long:A-long-
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