Java disconnects ArrayList to generate a random ArrayList, javaarraylist

Java disconnects ArrayList to generate a random ArrayList, javaarraylist

Write one by yourself. Sometimes it is necessary.

public static <V> boolean isEmpty(ArrayList<V> sourceList) {        return (sourceList == null || sourceList.size() == 0);    }

/*** Disrupt ArrayList ***/public static <V> ArrayList <V> randomList (ArrayList <V> sourceList) {if (isEmpty (sourceList) {return sourceList ;} arrayList <V> randomList = new ArrayList <V> (sourceList. size (); do {int randomIndex = Math. abs (new Random (). nextInt (sourceList. size (); randomList. add (sourceList. remove (randomIndex);} while (sourceList. size ()> 0); return randomList ;}

[Java] helps to randomly disrupt the order of an array element,

Dizzy. Don't bother.

Convert to list first (why do I use List at the beginning ?)

Example:

String [] arr = new String [] {"1", "2 "};
List list = Arrays. asList (arr );

Directly calling shuffle means random sorting.

Example: Collections. shuffle (list );

Direct output is the result you want.

Java cannot disrupt objects in the arraylist.

As long as a number is selected and inserted at the end, there will be no Bound problem.