The lastIndexOf() method of Chars Class in Guava library is used to find the last index of the given char value in a char array. This char value to be searched and the char 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 char value. If the value is not found, it returns -1.
Syntax:
public static int lastIndexOf(char[] array,
char target)
Parameters: This method accepts two mandatory parameters:
- array: which is the array of char values in which the char value is to searched.
- target: which is char value to be searched for last index in the char array.
Return Value: This method returns an integer value which is the last index of the specified char 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 Chars.lastIndexOf() method import com.google.common.primitives.Chars; import java.util.Arrays; class GFG { // Driver's code public static void main(String[] args) { // Creating a char array char[] arr = { 'a', 'b', 'c', 'd', 'b', 'c', 'b', 'd' }; char target = 'b'; // Using Chars.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 = Chars.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 Chars.lastIndexOf() method import com.google.common.primitives.Chars; import java.util.Arrays; class GFG { // Driver's code public static void main(String[] args) { // Creating a char array char[] arr = { 'a', 'b', 'c', 'd', 'b', 'c', 'b', 'd' }; char target = 'z'; // Using Chars.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 = Chars.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
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