java new constructor with array and int

Question

I am practicing with Java, and I'm trying to build an constructor that takes in an int[] array, and an int.

public static App(int[] name, int n) {}

Now in my main(), I am trying to build a new object with the constructor, and I'm getting an error message.

public static void main(String[] args) {
    int n;
    int[] name = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};

    App app1 = new App(name, n);

}

The error message I'm getting back is:

"constructor App in class App cannot be applied to given types; required: no arguments; found: int[],int; reason: actual and formal argument lists differ in length"

Can someone please explain more about what this error means, and how can I correct my code?

A constructor should (a) have the exact same name as the class (including upper/lower case), (b) no return type, (c) no static modifier. — RealSkeptic
– RealSkeptic, Commented Apr 12, 2017 at 16:38
a constructor cannot have a return type and must not be static also you dont want it to be private — 0xDEADBEEF
– 0xDEADBEEF, Commented Apr 12, 2017 at 16:43

Suresh Atta · Accepted Answer · 2017-04-12 16:32:32Z

1

public static App(int[] name, int n) {}

Thae became a static method with invalid signature and that is not constructor.

According to your description, It should be

public App(int[] name, int n) {

}

answered Apr 12, 2017 at 16:32

Suresh Atta

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5 Comments

as.beaulieu Over a year ago

I have changed from public static to public on the constructor, and I am still getting the same error message. To be more clear, my constructor now reads public int[] app(int[] name, int n) {}

Suresh Atta Over a year ago

@as.beaulieu It should not be. Atleast a different error message. Can you post a screenshot ?

Suresh Atta Over a year ago

@as.beaulieu Why there is a return again ? it should be just public App(int[] name, int n) {}

Lew Bloch Over a year ago

@as.beaulieu, what is app? Isn't your class named App? Please clarify.

0xDEADBEEF Over a year ago

@as.beaulieu it must not have a return type not even void please change your constructor to the specified answers

Elliott Frisch · Accepted Answer · 2017-04-12 16:32:51Z

1

A constructor does not have a static modifier, and a static method needs a return type. Your posted code isn't valid.

public static App(int[] name, int n) {}

should be

public App(int[] name, int n) {}

As it is, your class doesn't have a constructor at all - so you get the default (no-args) constructor.

answered Apr 12, 2017 at 16:32

Elliott Frisch

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Comments

Vasu · Accepted Answer · 2017-04-12 16:39:26Z

1

There are two problems with your code, you need to resolve both of them to make it compiled.

(1) A constructor can't have static keyword, so remove it

(2) variable n is not initialized, so initialize it before its first use as shown below:

int n=1; //or any value you wanted

answered Apr 12, 2017 at 16:39

Vasu

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