Java arrays: deduplication, add, delete elements

Importjava.util.List;Importjava.util.ArrayList;ImportJava.util.Set;ImportJava.util.HashSet; Public classCode { Public Static voidmain (String [] args) {TestA (); System.out.println ("===========================");        Testb (); System.out.println ("===========================");    TESTC (); }    //remove duplicate values from the array     Public Static voidTestA () {String [] str= {"Java", "C + +", "Php", "C #", "Python", "C + +", "Java"};  for(String elementa:str) {System.out.print (Elementa+ " "); } List<String> list =NewArraylist<string>();  for(inti=0; i<str.length; i++) {            if(!list.contains (Str[i]))            {List.add (str[i]); }        }string[] Newstr= List.toarray (NewSTRING[1]);//returns an array containing the specified type of all objects         for(String elementb:newstr) {System.out.print (Elementb+ " ");    } System.out.println (); }    //Delete One of the elements in an array     Public Static voidTestb () {String [] str= {"Java", "C + +", "Php", "C #", "Python"};//Remove PHPlist<string> list =NewArraylist<string>();  for(inti=0; i<str.length; i++) {List.add (str[i]); } list.remove (2);//list.remove ("Php")string[] Newstr= List.toarray (NewSTRING[1]);//returns an array containing the specified type of all objects    }    //add an element to an array     Public Static voidTESTC () {String [] str= {"Java", "C + +", "Php", "C #", "Python"};//Add Rubylist<string> list =NewArraylist<string>();  for(inti=0; i<str.length; i++) {List.add (str[i]); } list.add (2, "Ruby");string[] Newstr= List.toarray (NewSTRING[1]);//returns an array containing the specified type of all objects    }}

Java arrays: deduplication, add, delete elements