ArrayList

[java]代码库

import java.util.ArrayList;
import java.util.HashMap;

/** 
 * @ClassName: ArrayListTest2 
 * @Description: TODO(这里用一句话描述这个类的作用) 
 * @author Zhouwei
 * @date 2014-4-3 上午9:03:21 
 *  
 */
public class ArrayListTest2 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
			
		Student zhoutao=new Student("周涛",19);
		Student chenwenjie=new Student("陈文杰",20);
		Student qiaoxin=new Student("乔鑫",20);
		
		ArrayList arrList=new ArrayList();
		arrList.add(zhoutao);
		arrList.add(chenwenjie);
		arrList.add(qiaoxin);
		
		//查询name属性="陈文杰 " 的student 对象
		
		for(int i=0;i<arrList.size();i++){
			//取出元素,需要强转
		     Student s=(Student)arrList.get(i);
		     
		     if(s.getName().equals("陈文杰")){
		    	 System.out.println(s);
		     }
		 
		}
		
		
		//泛型集合  ArraList<元素类型>
		ArrayList<Student> list=new ArrayList<Student>();
		list.add(zhoutao);
		list.add(chenwenjie);
		list.add(qiaoxin);
		
		//泛型集合的好处，取元素不需强转
		Student s=list.get(0);
		
		HashMap<String, Student> map=new HashMap<String, Student>();
		
		
		
	}

}