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遍历数组四种方法

2010-05-08 10:21 567 查看
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遍历数组四种方法

import
java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

/**

 *
遍历数组四种方法

 *

 *

 * 2009-10-26

 *

 */

class Test {

 /**

  *

  *
注:Iterator
迭代器

  *

  * @param args

  */

 public static void main(String[] args) {

  Test1 t = new Test1();

  Test1 t1 = new Test1();

  List list = new ArrayList();

  list.add(1);

  list.add(2);

  list.add(4);

  list.add(3);

  

  Iterator iterator = list.iterator();

  System.out.println("------
方法一-------");

  while (iterator.hasNext()) {

   int i = Integer.parseInt(iterator.next().toString());

   System.out.println(i);

  }

  

  System.out.println("------
方法二-------");

  for (Iterator iter = list.iterator(); iter.hasNext();) {

   int i = Integer.parseInt(iter.next().toString());

   System.out.println(i);

  }

  

  System.out.println("------
方法三-------");

  for (Object obj : list) {

   System.out.println(obj);

  }

  

  System.out.println("------
方法四-------");

  for (int i = 0; i < list.size(); i++) {

   int k = Integer.parseInt(list.get(i).toString());

   System.out.println(k);

  }

 }

}

 
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