Simplest way to print an array in Java

Question

What's the simplest way of printing an array of primitives or of objects in Java? Here are some example inputs and outputs:

int[] intArray = new int[] {1, 2, 3, 4, 5};
//output: [1, 2, 3, 4, 5]

String[] strArray = new String[] {"John", "Mary", "Bob"};
//output: [John, Mary, Bob]

Answer 1

In Java 5 Arrays.toString(arr) or Arrays.deepToString(arr) for arrays within arrays. Note that Object[] version calls .toString() of each object in array. If my memory serves me correct, the output is even decorated in the exact way you're asking.

Answer 2

Always check the standard libraries first. Try:

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

or if your array contains other arrays as elements:

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

Answer 3

If you're using Java 1.4, you can instead do:

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

(This works in 1.5+ too, of course.)

Answer 4

This is nice to know, however, as for "always check the standard libraries first" I'd never have stumbled upon the trick of Arrays.toString( myarray )

--since I was concentrating on the type of myarray to see how to do this. I didn't want to have to iterate through the thing: I wanted an easy call to make it come out similar to what I see in the Eclipse debugger and myarray.toString() just wasn't doing it.

This works great. Thanks!!!

import java.util.Arrays;
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.
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System.out.println( Arrays.toString( myarray ) );