What's the Simplest Way to Print a Java Array?

Java Array Examples

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• Java Array - Create, Declare, Initialize and Print Examples
• How to Initialize an Array in Java in One Line
• What's the Simplest Way to Print a Java Array?
• Create and Initialize Two Dimensional Array in Java
• How to Check if Two Arrays are Equal in Java
• Java ArrayBlockingQueue Example
• Java Convert Array to Set
• Copying part of Array in Java Example
• Sorting an Array using Arrays.sort() Method
• Check Two Arrays are Deeply Equal
• Java Arrays.copyOf() Example - Copying an Array
• Java Arrays.binarySearch() Example - Searching an Array
• Java Arrays.asList() Example - Convert Array to ArrayList
• Java Convert Array to Stack Example
• Java Pyramid Examples

In this post, we show the simplest way to print different types of Array in Java with an example.

Java library provides Arrays.toString(arr) or Arrays.deepToString(arr) methods to print string representation of the contents of the specified array.

Print Array in Java Example

package net.javaguides.corejava;

import java.util.Arrays;

public class ArrayExample {

    public static void main(String[] args) {

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

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

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

Output:

[John, Mary, Bob]
[[Ljava.lang.String;@7852e922, [Ljava.lang.String;@4e25154f]
[[John, Mary], [Alice, Bob]]
[7.0, 9.0, 5.0, 1.0, 3.0]
[7, 9, 5, 1, 3]

Let's understand above program divided into small pieces:

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 ]

Reference

https://stackoverflow.com/questions/409784/whats-the-simplest-way-to-print-a-java-array