Java Example - Collection Inversion

The following examples demonstrate how to use the listIterator() and collection.reverse() methods of the Collection and Listiterator classes to reverse elements in a collection:

/*
 author by w3cschool.cc
 Main.java
 */

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.ListIterator;

class Main {
   public static void main(String[] args) {
      String[] coins = { "A", "B", "C", "D", "E" };
      List l = new ArrayList();
      for (int i = 0; i < coins.length; i++)
         l.add(coins[i]);
      ListIterator liter = l.listIterator();
      System.out.println("反转前");
      while (liter.hasNext())
         System.out.println(liter.next());
      Collections.reverse(l);
      liter = l.listIterator();
      System.out.println("反转后");
      while (liter.hasNext())
         System.out.println(liter.next());
   }
}

The output result of running the above code is:

反转前
A
B
C
D
E
反转后
E
D
C
B
A

The above is the Java example - the content of set reversal. For more related content, please pay attention to the PHP Chinese website (www. php.cn)!