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