Introduction to the differences between Java collections and arrays

This article mainly introduces the difference between Java collections and arrays. It has a very good reference value. Let’s take a look at it with the editor.

Collections and containers are both containers in Java.

Difference

Array features: fixed size, can only store data of the same data type

Collection features: the size can be dynamically expanded, and can store various Types of data

Conversion

Convert array to collection:

Arrays.asList( Array)

Example:

int[] arr = {1,3,4,6,6};
Arrays.asList(arr);
for(int i=0;i<arr.length;i++){
  System.out.println(arr[i]);
}　　

##Collection converted to array:

Collection.toArray();

Example:

List list = new ArrayList();
list.add("a");
list.add("b"); 
list.toArray();
System.out.println(list.toString());　　

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