iteratordemo.java~1~

来自「java2参考大全上的例子的源码和自己的理解.」· JAVA~1~ 代码 · 共 61 行

package iterator和listiterator;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2005</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */

// Demonstrate iterators.
import java.util.*;

class IteratorDemo {
  public static void main(String args[]) {
    // create an array list
    ArrayList al = new ArrayList();

    // add elements to the array list
    al.add("C");
    al.add("A");
    al.add("E");
    al.add("B");
    al.add("D");
    al.add("F");

// use iterator to display contents of al
    System.out.print("Original contents of al: ");
    Iterator itr = al.iterator();
    while (itr.hasNext()) {
      Object element = itr.next();
      System.out.print(element + " ");
    }
    System.out.println();

    // modify objects being iterated
    ListIterator litr = al.listIterator();
    while (litr.hasNext()) {
      Object element = litr.next();
      litr.set(element + "+");
    }

    System.out.print("Modified contents of al: ");
    itr = al.iterator();
    while (itr.hasNext()) {
      Object element = itr.next();
      System.out.print(element + " ");
    }
    System.out.println();

    // now, display the list backwards
    System.out.print("Modified list backwards: ");
    while (litr.hasPrevious()) {
      Object element = litr.previous();
      System.out.print(element + " ");
    }
    System.out.println();
  }
}