arraylisttoarray.java

软通公司培训的课件和习题里面有答案。。。

package com.eight.java;

import java.util.*;

public class ArrayListToArray {

	public static void main(String[] args) {
		 ArrayList list = new ArrayList();
		 list.add(new Integer(100));
		 list.add(new Integer(46));
		 list.add(new Integer(12));
		 System.out.println("ArrayList:"+list);
		 
		 Object[] ar = list.toArray() ;
		 int sum = 0 ;
		 for(int i=0;i<ar.length;i++){
			 sum += ((Integer)ar[i]).intValue();    // 数组是 Oject类型,转换称int
		 }
		 System.out.println("SUM:"+sum);

	}

}