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

Update link of documentation to latest LTS

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edited Feb 10, 2023 at 8:56

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Since Java 5 you can use Arrays.toString(arr)Arrays.toString(arr) or Arrays.deepToString(arr)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 ]

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 ]

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 ]

Just extracting some additional output from the code fragment to be consistent.

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edited Sep 29, 2022 at 19:02

YoYo

9.5k
8
62
75

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));
//output: [[Ljava.lang.String;@106d69c,Gives [Ljava.lang.String;@52e922]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 ]

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"}};
System.out.println(Arrays.toString(deepArray));
//output: [[Ljava.lang.String;@106d69c, [Ljava.lang.String;@52e922]
System.out.println(Arrays.deepToString(deepArray));

Output:

[[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 ]

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 ]

Fixed indentation of the output, removed redundant padding and removed the import statement. The package is already available in the link.

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edited Jan 7, 2021 at 11:35

Ivar

7k
12
58
69

Since Java 5 you can import java.util.Arrays; and then 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]

Output:

    [John, Mary, Bob]

Nested Array:

  String[][] deepArray = new String[][] {{"John", "Mary"}, {"Alice", "Bob"}};
  System.out.println(Arrays.toString(deepArray));
  //output: [[Ljava.lang.String;@106d69c, [Ljava.lang.String;@52e922]
  System.out.println(Arrays.deepToString(deepArray));

Output:

[[John, Mary], [Alice, Bob]]

Output:

    [[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 ]

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 ]

Output:

    [7, 9, 5, 1, 3 ]

Since Java 5 you can import java.util.Arrays; and then 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"}};
  System.out.println(Arrays.toString(deepArray));
  //output: [[Ljava.lang.String;@106d69c, [Ljava.lang.String;@52e922]
  System.out.println(Arrays.deepToString(deepArray));

Output:

    [[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 ]

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"}};
System.out.println(Arrays.toString(deepArray));
//output: [[Ljava.lang.String;@106d69c, [Ljava.lang.String;@52e922]
System.out.println(Arrays.deepToString(deepArray));

Output:

[[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 ]

the import statement for 'Arrays' should be provided in this answer as well.

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edited Sep 20, 2020 at 21:47

questionto42

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deleted 53 characters in body

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edited Feb 8, 2019 at 20:00

azro

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Rollback to Revision 12 - Edit approval overridden by post owner or moderator

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edited Dec 6, 2018 at 20:43

Esko

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Edited first sentence to remove ambiguity

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edit approved Oct 31, 2018 at 0:13

TechnicallyTrue

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add llinks to documentation

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edited Nov 22, 2017 at 20:33

diralik

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formatting improvements (break up code blocks)

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edited Mar 24, 2016 at 20:12

randers

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fixed wording, marked code. also: we don't need to add a remark about which packages to include in each and every post..

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edited Feb 17, 2016 at 7:50

Georg Plaz

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Rollback to Revision 6

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edited Jan 5, 2016 at 18:14

Pshemo

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int count = 0; for (int i = 0; i < numbers.length; i++) { System.out.print(numbers[i] + " "); count++; if (count == 10) { System.out.println(); count = 0; } }

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edited Nov 3, 2015 at 10:30

Saddam Abu Ghaida

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int count = 0; for (int i = 0; i < numbers.length; i++) { System.out.print(numbers[i] + " "); count++; if (count == 10) { System.out.println(); count = 0; } }

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edit approved Nov 3, 2015 at 10:30

Community Bot

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Added double and int support

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edited Oct 21, 2015 at 22:05

Naveed Ahmad

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For beginners like myself, this would be highly appreciated (might be irritating for advanced users however)

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edited Aug 18, 2015 at 9:16

mleko

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For beginners like myself, this would be highly appreciated (might be irritating for advanced users however)

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edit approved Aug 18, 2015 at 9:16

Solocid

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take out weird sentence fragment

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edited May 25, 2015 at 23:27

Barett

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Explain necessary import for noobs.

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edited Jul 31, 2013 at 2:00

Richard Cotrina

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Post Made Community Wiki by Esko

occurred Oct 3, 2012 at 8:51

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answered Jan 3, 2009 at 20:43

Esko

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Collectives™ on Stack Overflow

Return to Answer

Simple Array:

Nested Array:

`double` Array:

`int` Array:

Simple Array:

Nested Array:

`double` Array:

`int` Array:

Simple Array:

Nested Array:

`double` Array:

`int` Array:

Simple Array:

Nested Array:

`double` Array:

`int` Array:

Simple Array:

Nested Array:

`double` Array:

`int` Array:

Simple Array:

Nested Array:

`double` Array:

`int` Array:

Simple Array:

Nested Array:

`double` Array:

`int` Array:

Simple Array:

Nested Array:

`double` Array:

`int` Array:

Simple Array:

Nested Array:

`double` Array:

`int` Array:

Collectives™ on Stack Overflow

Return to Answer

Simple Array:

Nested Array:

double Array:

int Array:

Simple Array:

Nested Array:

double Array:

int Array:

Simple Array:

Nested Array:

double Array:

int Array:

Simple Array:

Nested Array:

double Array:

int Array:

Simple Array:

Nested Array:

double Array:

int Array:

Simple Array:

Nested Array:

double Array:

int Array:

Simple Array:

Nested Array:

double Array:

int Array:

Simple Array:

Nested Array:

double Array:

int Array:

Simple Array:

Nested Array:

double Array:

int Array:

`double` Array:

`int` Array:

`double` Array:

`int` Array:

`double` Array:

`int` Array:

`double` Array:

`int` Array:

`double` Array:

`int` Array:

`double` Array:

`int` Array:

`double` Array:

`int` Array:

`double` Array:

`int` Array:

`double` Array:

`int` Array: