A concise introduction to collections and arrays

Collections and Array arrays

Arrays can store both the base data type and the object data type, but the length of the array is fixed for cases where the length is clear.

Collection

A collection can store only objects, object types can be different, and are variable in length, for cases where the length is ambiguous, or if the storage object differs

Code practices

Package Com.github.ljmatlight;import java.util.ArrayList;/*** Description: Collections and Arrays* The <br/> Array can store both the base data type and the object data type, but the length of the array is fixed for cases where the length is clear. * <br/> Collection can only store objects, object types may be different, and the length is variable, suitable for cases where the length is ambiguous or the storage object is not. * <br/> author:ljmatlight */ Public classListandarray { Public Static void Main(string[] args) {the//array can store both the base data type and the object data type, but the length of the array is fixed for cases where the length is clear.         int[] Intarray =New int[Ten]; integer[] Integerarray =Newinteger[Ten]; for(inti =0; I <Ten; i++) {Intarray[i] =TenI Integerarray[i] =NewInteger (Ten-i); }intIntarraylength = Intarray.length; for(inti =0; i < intarraylength; i++) {System. out.println("int:"+ i +" = "+ intarray[i]); }intIntegerarraylength = Integerarray.length; for(inti =0; i < integerarraylength; i++) {System. out.println("Integer:"+ i +" = "+ integerarray[i]); }// ===================================================================        The //collection can store only objects, object types can be different, and the length is variable, for cases where the length is ambiguous or the storage object is not. Arraylist<object> objectarraylist =NewArraylist<> (); Objectarraylist.Add("A"); Objectarraylist.Add(1000L); Objectarraylist.Add(false); Objectarraylist.ForEach(O-System. out.println("O = ="+ O)); }}

With the wind floating clouds
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A concise introduction to collections and arrays