Why can't we just use arrays instead of varargs?

Why can't we just use arrays instead of varargs?

By : user2948373
Date : November 14 2020, 04:51 PM
may help you . I just came across varargs while learning android(doInBackground(Type... params)) ,SO posts clarified the use of it , The only difference between
code :
foo(String... strings)
foo(String[] strings)
foo("a", "b");
for(new String[] { "a", "b" }); // Valid for either declaration

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Why are varargs and arrays sometimes incompatible?

Why are varargs and arrays sometimes incompatible?

By : user6321804
Date : March 29 2020, 07:55 AM
may help you . there is a method like this:
code :
class Test
void go()
    foo("first", "second", "third", new String []{"hello", "world"});

 void foo(String first, final String second, final String third, final String... headers) {}

Overloading varargs arrays, choosing method

Overloading varargs arrays, choosing method

By : eleanor66
Date : March 29 2020, 07:55 AM
With these it helps This is basically compiler deciding to call the most specific method among all.
When you call
code :
System.out.println(foo(i));//Object[]... vs Integer[]...
   //Object... vs Integer[]...
    public static String bar(Object args) {

        return "Object args";

    public static String bar(Integer[] args) {
        return "Integer[] args";
Casting object arrays in varargs

Casting object arrays in varargs

By : manokara
Date : March 29 2020, 07:55 AM
will help you Assuming that Rectangle class implements Relatable interface and that Rectangle class has move(int x, int y) method, you get ClassCastException because you cannot treat an array of Relatable as an array of Rectangle even though Rectangle implements an Relatable. Java arrays are covariant, that means it is allowed to do stuff like that:
code :
public class A {...}
public class B extends A{...}
A[] array = new B[2];
public static void moveAll( int x, int y, Relatable... obj) {

    for(Relatable r: obj){
        ((Rectangle)r).move(x, y);

public interface Relatable {
    public static void moveAll( int x, int y, Relatable... obj) {

        for(Relatable r: obj){
            r.move(x, y);


    public void move(int x, int y);

How to pass two arrays into one varargs

How to pass two arrays into one varargs

By : DennisVD
Date : March 29 2020, 07:55 AM
Hope that helps Sadly not possible in java as there is no spread operator (like in Kotlin, Ecmascript 6). You have to work your way around this by creating an intermediate array:
code :
String arrayThree = new String[arrayOne.length + arrayTwo.length];
System.arraycopy(arrayOne, 0, arrayThree, 0, arrayOne.length);
System.arraycopy(arrayTwo, 0, arrayThree, arrayOne.length, arrayTwo.length);

String arrayThree = Stream.concat(Arrays.stream(arrayOne), Arrays.stream(arrayTwo))
val arrayOne: Array<String> = ...
val arrayTwo: Array<String> = ...

doSomething(*arrayOne, *arrayTwo)
const arrayOne = ...
const arrayTwo = ...

doSomething([...arrayOne, ...arrayTwo]);
Java varargs with 2-dimensional arrays

Java varargs with 2-dimensional arrays

Date : March 29 2020, 07:55 AM
hop of those help? The following works for me. Perhaps you're not doing what you think you're doing?
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