Creating a new ArrayList in Java

Question

Assuming that I have a class named Class   And I would like to make a new ArrayList that it s values will be of type Class   My question is that  How do I do that   I can t understand from Java Api   I tried this   ArrayList lt Class gt  myArray  new ArrayList ArrayList lt Class gt

User · Answer

You can use in Java 8   List lt Class gt  myArray  new ArrayList lt  gt

User · Answer

If you just want a list   ArrayList lt Class gt  myList   new ArrayList lt Class gt       If you want an arraylist of a certain length  in this case size 10    List lt Class gt  myList   new ArrayList lt Class gt  10     If you want to program against the interfaces  better for abstractions reasons    List lt Class gt  myList   new ArrayList lt Class gt       Programming against interfaces is considered better because it s more abstract  You can change your Arraylist with a different list implementation  like a LinkedList  and the rest of your application doesn t need any changes

User · Answer

You re very close  Use same type on both sides  and include      ArrayList lt Class gt  myArray   new ArrayList lt Class gt

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Material please go through this Link  And also try this   ArrayList lt Class gt  myArray  new ArrayList lt Class gt

User · Answer

ArrayList lt Class gt  myArray   new ArrayList lt Class gt       Here ArrayList of the particular Class will be made  In general one can have any datatype like int char  string or even an array in place of Class   These are added to the array list using      myArray add      And the values are retrieved using       myArray get

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Do this  List lt Class gt  myArray  new ArrayList lt Class gt

User · Answer

You are looking for Java generics  List lt MyClass gt  list   new ArrayList lt MyClass gt       Here s a tutorial http   docs oracle com javase tutorial java generics index html

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Java 8  In order to create a non-empty list of fixed size where different operations like add  remove  etc won t be supported   List lt Integer gt  fixesSizeList  Arrays asList 1  2     Non-empty mutable list   List lt Integer gt  mutableList   new ArrayList lt  gt  Arrays asList 3  4      Java 9  With Java 9 you can use the List of      static factory method   List lt Integer gt  immutableList   List of 1  2    List lt Integer gt  mutableList   new ArrayList lt  gt  List of 3  4      Java 10  With Java 10 you can use the Local Variable Type Inference   var list1   List of 1  2    var list2   new ArrayList lt  gt  List of 3  4     var list3   new ArrayList lt String gt       Check out more ArrayList examples here

User · Answer

Fixed the code for you     ArrayList lt Class gt  myArray  new ArrayList lt Class gt

[java] Creating a new ArrayList in Java

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