The lastIndexOf() method of Doubles Class in Guava library is used to find the last index of the given double value in a double array. This double value to be searched and the double 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 double value. If the value is not found, it returns -1.
Syntax:
public static int lastIndexOf(double[] array,
double target)
Parameters: This method accepts two mandatory parameters:
- array: which is the array of double values in which the double value is to searched.
- target: which is double value to be searched for last index in the double array.
Return Value: This method returns an integer value which is the last index of the specified double value. If the value is not found, it returns -1.
Below programs illustrates this method:
Example 1:
// Java code to show implementation of // Guava's Doubles.lastIndexOf() method import com.google.common.primitives.Doubles;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating a double array
double[] arr = { 1.2, 2.2, 3.2, 4.2,
3.2, 5.6, 3.2, 4.4 };
double target = 3.2;
// Using Doubles.lastIndexOf() method
// to get the index of last appearance
// of a given element in array
// and return -1 if element is
// not found in the array
int index
= Doubles.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:
// Java code to show implementation of // Guava's Doubles.lastIndexOf() method import com.google.common.primitives.Doubles;
import java.util.Arrays;
class GFG {
// Driver's code
public static void main(String[] args)
{
// Creating a double array
double[] arr = { 1.2, 2.2, 3.2, 4.2,
3.2, 5.6, 3.2, 4.4 };
double target = 10.2;
// Using Doubles.lastIndexOf() method
// to get the index of last appearance
// of a given element in array
// and return -1 if element is
// not found in the array
int index
= Doubles.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