How to convert an int array to String with toString method in Java

Question

I am using trying to use the toString(int[]) method, but I think I am doing it wrong:

http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Arrays.html#toString(int[])

My code:

int[] array = new int[lnr.getLineNumber() + 1];
int i = 0;

System.out.println(array.toString());

The output is:

[I@23fc4bec

Also I tried printing like this, but:

System.out.println(new String().toString(array));  // **error on next line**
The method toString() in the type String is not applicable for the arguments (int[])

I took this code out of bigger and more complex code, but I can add it if needed. But this should give general information.

I am looking for output, like in Oracle's documentation:

The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space).

Answer 1

What you want is the Arrays.toString(int[]) method:

import java.util.Arrays;

int[] array = new int[lnr.getLineNumber() + 1];
int i = 0;

..      

System.out.println(Arrays.toString(array));

There is a static Arrays.toString helper method for every different primitive java type; the one for int[] says this:

public static String toString(int[] a)

Returns a string representation of the contents of the specified array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(int). Returns "null" if a is null.