Java遍历集合、数组的四种方法

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;
/**

* 遍历数组四种方法

*

* @author JRunner

*

* 2009-10-26

*

* Email: JRunner@126.com

*/

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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