Java Guava | Doubles.lastIndexOf() method with Examples
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" ); } } } |
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" ); } } } |
Target is not present in the array
Reference: https://google.github.io/guava/releases/19.0/api/docs/com/google/common/primitives/Doubles.html#lastIndexOf(double[], %20double)