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Answer by Acuna for How can I create a generic array in Java?

Arrays do not support generics (because it's another type of data), but you can use undeterminate generics while its creation if you don't need casting. By the way, it's better than using...

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Answer by Sam Ginrich for How can I create a generic array in Java?

The syntaxGenSet<Integer> intSet[] = new GenSet[3];creates an array of null references, to be filled asfor (int i = 0; i < 3; i++){ intSet[i] = new GenSet<Integer>();}which is type safe.

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Answer by user1708042 for How can I create a generic array in Java?

If you really want to wrap a generic array of fixed size you will have a method to add data to that array, hence you can initialize properly the array there doing something like this:import...

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Answer by Irfan Ul Haq for How can I create a generic array in Java?

Generic array creation is disallowed in Java, but you can do it like:class Stack<T> { private final T[] array; public Stack(int capacity) { array = (T[]) new Object[capacity]; }}

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Answer by Rodrigo Asensio for How can I create a generic array in Java?

Passing a list of values...public <T> T[] array(T... values) { return values;}

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Answer by user4910279 for How can I create a generic array in Java?

You do not need to pass the Class argument to the constructor.Try this.public class GenSet<T> { private final T[] array; @SafeVarargs public GenSet(int capacity, T... dummy) { if (dummy.length...

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Answer by Crab Nebula for How can I create a generic array in Java?

I actually found a pretty unique solution to bypass the inability to initiate a generic array. You have to create a class that takes in the generic variable T like so:class GenericInvoker <T> { T...

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Answer by KeyC0de for How can I create a generic array in Java?

I have found a quick and easy way that works for me. Note that I have only used this on Java JDK 8. I don't know if it will work with previous versions.Although we cannot instantiate a generic array of...

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Answer by developer747 for How can I create a generic array in Java?

I found a sort of a workaround to this problem.The line below throws generic array creation error:List<Person>[] personLists=new ArrayList<Person>()[10];However, if I encapsulate...

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Answer by Benjamin M for How can I create a generic array in Java?

What about this solution?@SafeVarargspublic static <T> T[] toGenericArray(T ... elems) { return elems;}It works and looks too simple to be true. Is there any drawback?

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Answer by plugwash for How can I create a generic array in Java?

No one else has answered the question of what is going on in the example you posted.import java.lang.reflect.Array;class Stack<T> { public Stack(Class<T> clazz, int capacity) { array =...

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Answer by Pedram Esmaeeli for How can I create a generic array in Java?

Actually an easier way to do so, is to create an array of objects and cast it to your desired type like the following example:T[] array = (T[])new Object[SIZE];where SIZE is a constant and T is a type...

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Answer by Zubair Ibrhaim for How can I create a generic array in Java?

private E a[];private int size;public GenSet(int elem){ size = elem; a = (E[]) new E[size];}

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Answer by samir benzenine for How can I create a generic array in Java?

You could use a cast:public class GenSet<Item> { private Item[] a; public GenSet(int s) { a = (Item[]) new Object[s]; }}

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Answer by Cambot for How can I create a generic array in Java?

I'm wondering if this code would create an effective generic array?public T [] createArray(int desiredSize){ ArrayList<T> builder = new ArrayList<T>(); for(int x=0;x<desiredSize;x++){...

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Answer by Radiodef for How can I create a generic array in Java?

In Java 8, we can do a kind of generic array creation using a lambda or method reference. This is similar to the reflective approach (which passes a Class), but here we aren't using...

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Answer by Valentino for How can I create a generic array in Java?

The forced cast suggested by other people did not work for me, throwing an exception of illegal casting.However, this implicit cast worked fine:Item<K>[] array = new Item[SIZE];where Item is a...

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Answer by Mohsen Afshin for How can I create a generic array in Java?

Maybe unrelated to this question but while I was getting the "generic array creation" error for using Tuple<Long,String>[] tupleArray = new Tuple<Long,String>[10];I find out the following...

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Answer by Jason C for How can I create a generic array in Java?

To extend to more dimensions, just add []'s and dimension parameters to newInstance() (T is a type parameter, cls is a Class<T>, d1 through d5 are integers):T[] array =...

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Answer by MatheusJardimB for How can I create a generic array in Java?

Look also to this code:public static <T> T[] toArray(final List<T> obj) { if (obj == null || obj.isEmpty()) { return null; } final T t = obj.get(0); final T[] res = (T[])...

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Answer by Bobster for How can I create a generic array in Java?

I made this code snippet to reflectively instantiate a class which is passed for a simple automated test utility.Object attributeValue = null;try { if(clazz.isArray()){ Class<?> arrayType =...

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Answer by StarMonkey for How can I create a generic array in Java?

An easy, albeit messy workaround to this would be to nest a second "holder" class inside of your main class, and use it to hold your data.public class Whatever<Thing>{ private class...

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Answer by irreputable for How can I create a generic array in Java?

This is the only answer that is type-safe:E[] a;a = newArray(size);@SafeVarargsstatic <E> E[] newArray(int length, E... array){ return Arrays.copyOf(array, length);}

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Answer by puneeth for How can I create a generic array in Java?

Generics are used for type checking during compile time. Therefore, the purpose is to checkWhat comes in is what you need.What you return is what the consumer needs.Check this:Don't worry about...

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Answer by David Bernard for How can I create a generic array in Java?

Try this:private int m = 0;private int n = 0;private Element<T>[][] elements = null;public MatrixData(int m, int n){ this.m = m; this.n = n; this.elements = new Element[m][n]; for (int i = 0; i...

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Answer by gdejohn for How can I create a generic array in Java?

Here's how to use generics to get an array of precisely the type you’re looking for while preserving type safety (as opposed to the other answers, which will either give you back an Object array or...

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Answer by dimo414 for How can I create a generic array in Java?

You can do this:E[] arr = (E[])new Object[INITIAL_ARRAY_LENGTH];This is one of the suggested ways of implementing a generic collection in Effective Java; Item 26. No type errors, no need to cast the...

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Answer by Bill Michell for How can I create a generic array in Java?

Java generics work by checking types at compile time and inserting appropriate casts, but erasing the types in the compiled files. This makes generic libraries usable by code which doesn't understand...

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Answer by Varkhan for How can I create a generic array in Java?

I have to ask a question in return: is your GenSet"checked" or "unchecked"?What does that mean?Checked: strong typing. GenSet knows explicitly what type of objects it contains (i.e. its constructor was...

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Answer by Jeff Olson for How can I create a generic array in Java?

This is covered in Chapter 5 (Generics) of Effective Java, 2nd Edition, item 25...Prefer lists to arraysYour code will work, although it will generate an unchecked warning (which you could suppress...

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Answer by Esko for How can I create a generic array in Java?

You could create an Object array and cast it to E everywhere. Yeah, it's not very clean way to do it but it should at least work.

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Answer by Ola Bini for How can I create a generic array in Java?

The example is using Java reflection to create an array. Doing this is generally not recommended, since it isn't typesafe. Instead, what you should do is just use an internal List, and avoid the array...

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How can I create a generic array in Java?

Due to the implementation of Java generics, you can't have code like this:public class GenSet<E> { private E a[]; public GenSet() { a = new E[INITIAL_ARRAY_LENGTH]; // Error: generic array...

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