b.get(0)---> a 其实这里就是a对象了（而且已经被clear）,然后你继续get(0),a对象已经被你clear()了，那么会报错是理所应当的，并不是b的元素被清理掉了，b的元素就是b.get(0)
list.add("Java"); list.add("Python"); //清空集合 list.clear(); 在这个例子中,我们使用了List中的Clear方法来清除List中的所有元素。 4、Clear方法需要注意的地方 在使用Clear方法时,需要注意以下两点: (1)Clear方法清除的是集合中的元素,而不是释放集合的引用。 (2)Clear方法只能清除集合中的元素,而不...
Learn to clear arraylist or empty an arraylist in Java. Clearing a list means to remove all elements from the list. Difference between clear and removeAll.
ArrayList<String> A= new ArrayList<String>(); A.add("1"); A.add("2"); ArrayList<String> B = new ArrayList<String>();; B = A; A.clear(); A清空后发现B也清空了。 此时B对象相当与A对象的引用,而并不是将A对象的值单纯的传递给B对象。即:B对象的操作将直接改变A对象。如B.add("3")...
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0 How to correctly clear list in java 34 Java ArrayList clear() function 12 How do I clear an ArrayList? 0 Clearing a specific arraylist instead of all the copies of it 1 Java ArrayList clear() method 1 Clear() function for Arraylist in Arraylist 1 Java ArrayList.clear() function...
Clear a selection : Selection « Document « JavaScript DHTMLJavaScript DHTML Document Selection Clear a selection <head> <script language="JavaScript"> function function1() { document.selection.clear(); } </script> </head> <body> <p id=...
Does it take the garbage collector longer to free up objects that are sitting in a list, even if the list itself is no longer referenced? If so, will they free up sooner if I call clear() on the list before it goes out of context? thanks - dave java list garbage-collection Share ...
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