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");        }    }} |
Output:
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");        }    }} |
Output:
Target is not present in the array
