Set array method on java

Another way to solve this declare the argument as a "varargs" argument as follows:

public void setArray(int ... array) {
     _array = array;
}

and then this will work:

A.setArray(1, 2, 3, 4, 5);

You can do the same with a constructor argument.

While I have your attention, it is important that you learn the Java naming conventions, and learn to follow them strictly.

• A class name should always start with an uppercase letter
• A variable name should always start with a lowercase letter ... unless it is a static final constant.
• Using an underscore as a prefix generally frowned on.

For more information, read the Java Style Guidelines.

So your example class should look like this:

public class ArrayFun {

    private int[] array;

    public void setArray(int ... array) {
       this.array = array;
    }
}

and should be used like this:

ArrayFun a = new ArrayFun();
a.setArray(1, 2, 3, 4, 5);

You can use this instead

public void setArray(int... array) { _array = array; }

// later
ArrayFun a = new ArrayFun(some_constructor_values);
a.setArray(1,2,3,4,5);

Unless you take a copy of the array, you will be using the same array in the caller and callee.

What you're asking to do doesn't really make sense. Also, why use a function to "set the array", why not just set the array directly:

_array = newArray

You can also set an array's values like this:

int[] array = {1,2,3,4,5};

Your method's signature is :

public void setArray(int[] array)

So it accepts only one argument that is of type array of integers.

But in your method call, you are calling it as:

A.setArray(1,2,3,4,5);

In this you are passing 5 arguments to the method. So it does not match any method with 5 arguments. Thats why it does not work.

You should pass one array of integers.

You can do it in various ways :

int myArr[] = {1,2,3,4,5};
A.setArray(myArr);

or

A.setArray(new int[]new int[]{1,2,3,4,5});

Setting array the way you did is fine. But what you are setting from A.setArray(1,2,3,4,5); will throw you error saying "Method setArray(int,int,int,int,int) is not found".

You can do something like int[] ar = { 1, 2 }; a.setArray(ar);