lx18.java

JAVA学习源代码,大家可以好好参考,请多提宝贵意见

import java.util.*;
public class Lx18
{
	public static void main(String args[])
	{
		Object w=new Float(3.12f);
		ArrayList al=new ArrayList();
		al.add(new Integer(1));
		al.add(new Integer(2));
		al.add(new Integer(3));
		al.add(w);
		System.out.println("Contents of al:"+al);
		Object ia[]=al.toArray();
		System.out.println(ia[2]);
		System.out.println(w);
		//System.out.println(w+w);
		int sum=0;
		for(int i=0;i<ia.length;i++)
		{
			sum+=((Integer)ia[i]).intValue();
			//sum+=ia[i];
			System.out.println("sum="+sum);
		}
			
		
	}
}