二维ArrayList，get()方法为引用，arraylistget

二维ArrayList，get()方法为引用，arraylistget

从二维ArrayList通过get()得到element，对element的操作会反映在从二维ArrayList
public void MultiDimArrayListOpr(){
		ArrayList<Double> list1 = new ArrayList<Double>(2);
		ArrayList<Double> list2 = new ArrayList<Double>(4);
		ArrayList<Double> list3 = new ArrayList<Double>(3);
		ArrayList<ArrayList<Double>> twoDimList = new ArrayList<ArrayList<Double>>(3);
		
		list1.add(3.5);
		list1.add(6.9);

		list2.add(1.5);
		list2.add(7.9);
		list2.add(3.3);
		list2.add(8.9);

		list3.add(1.9);
		list3.add(8.2);
		list3.add(5.8);
		
		twoDimList.add(list1);
		twoDimList.add(list2);
		twoDimList.add(list3);
		
		int count = 0;
		for(List<Double> tmp : twoDimList){
			System.out.print("twoDimList index: ");
			System.out.println(count++);
			for(Double temp : tmp){
			    System.out.println(temp);
		    }
		}
		
		ArrayList<Double> tmpList = twoDimList.get(1);
		
		System.out.println("twoDimList 2:");
		for(Double temp : tmpList){
			System.out.println(temp);
		}
		
		System.out.println("。。。Test ArrayList reference。。。！");
		
		tmpList.remove(0);
		tmpList.add(15.7);
		
		count = 0;
		for(List<Double> tmp : twoDimList){
			System.out.print("twoDimList index: ");
			System.out.println(count++);
			for(Double temp : tmp){
			    System.out.println(temp);
		    }
		}
		System.out.println("Test end！");
	}