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Get reverse order using Comparator in Java
The objects of a user defined class can be ordered using the Comparator interface in Java. The java.util.Collections.reverseOrder() method reverses the order of an element collection using a Comparator.
A program that demonstrates this is given as follows −
Example
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
public class Demo {
public static void main(String args[]) throws Exception {
Comparator comparator = Collections.reverseOrder(); { "John", "Amy", "Susan", "Peter" };
int n = str.length;
System.out.println("The array elements are: ");
for (int i = 0; i < n; i++) {
System.out.println(str[i]);
}
Arrays.sort(str, comparator);
System.out.println("
The array elements sorted in reverse order are: ");
for (int i = 0; i < n; i++) {
System.out.println(str[i]);
}
}
}The output of the above program is as follows −
The array elements are: John Amy Susan Peter The array elements sorted in reverse order are: Susan Peter John Amy
Now let us understand the above program.
The Comparator is created along with reverseOrder() method. Then the string array str[] is defined and then the elements are displayed using a for loop. A code snippet which demonstrates this is as follows −
Comparator comparator = Collections.reverseOrder(); { "John", "Amy", "Susan", "Peter" };
int n = str.length;
System.out.println("The array elements are: ");
for (int i = 0; i < n; i++) {
System.out.println(str[i]);
}The string array is sorted in reverse order using the java.util.Arrays.sort() method. Then the array elements are displayed using a for loop. A code snippet which demonstrates this is as follows −
Arrays.sort(str, comparator);
System.out.println("
The array elements sorted in reverse order are: ");
for (int i = 0; i < n; i++) {
System.out.println(str[i]);
}
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