What's the simplest way to print a Java array?

In Java, arrays don't override toString(), so if you try to print one directly, you get the className + '@' + the hex of the hashCode of the array, as defined by Object.toString():
int[] intArray = new int[] {1, 2, 3, 4, 5};
System.out.println(intArray); // Prints something like '[I@3343c8b3'


But usually, we'd actually want something more like [1, 2, 3, 4, 5]. What's the simplest way of doing that? Here are some example inputs and outputs:
// Array of primitives:
int[] intArray = new int[] {1, 2, 3, 4, 5};
// Output: [1, 2, 3, 4, 5]

// Array of object references:
String[] strArray = new String[] {"John", "Mary", "Bob"};
// Output: [John, Mary, Bob]


Since Java 5 you can use Arrays.toString(arr) or Arrays.deepToString(arr) for arrays within arrays. Note that the Object[] version calls .toString() on each object in the array. The output is even decorated in the exact way you're asking.

Examples:

• Simple Array:

String[] array = new String[] {"John", "Mary", "Bob"};
System.out.println(Arrays.toString(array));

Output:

[John, Mary, Bob]

• Nested Array:

String[][] deepArray = new String[][] {{"John", "Mary"}, {"Alice", "Bob"}};
// Gives undesired output:
System.out.println(Arrays.toString(deepArray));
// Gives the desired output:
System.out.println(Arrays.deepToString(deepArray));

Output:

[[Ljava.lang.String;@106d69c, [Ljava.lang.String;@52e922]
[[John, Mary], [Alice, Bob]]

• double Array:

double[] doubleArray = { 7.0, 9.0, 5.0, 1.0, 3.0 };
System.out.println(Arrays.toString(doubleArray));

Output:

[7.0, 9.0, 5.0, 1.0, 3.0 ]

• int Array:

int[] intArray = { 7, 9, 5, 1, 3 };
System.out.println(Arrays.toString(intArray));

Output:

[7, 9, 5, 1, 3 ]

Stack Overflow Q#409784, score: 3267