作业9-1

package ArrayList;  
  
import java.util.ArrayList;  
import java.util.Iterator;  
import java.util.List;  
  
public class Arraya {  
  
    public static void main(String[] args) {  
        // TODO 自动生成的方法存根  
        List<String> list =new ArrayList<String>();  
        System.out.println("100元素：");  
        for(int i=0;i<100;i++) {  
            list.add(""+i);  
        }  
        System.out.println("输出字符：");  
        Iterator it = list.iterator();  
        while(it.hasNext()) {  
            Object obj = it.next();  
            System.out.println(obj);  
        }         
        System.out.println("字符串长度:"+list.size());  
        System.out.println("获取元素：");  
        try {  
        System.out.println("第50元素:
"+list.get(50));  
        System.out.println("第102元素：");  
        System.out.println(list.get(102));  
        }catch(Exception e){  
            System.out.println("元素下标越界！");  
        }  
        System.out.println("字符串长度"+list.size());  
    }  
  
}