You cannot print array elements directly in Java, you need to useArrays.toString() orArrays.deepToString() to print array elements. UsetoString() if you want to print a one-dimensional array and usedeepToString() method if you want to print a two-dimensional array. Have you tried printing arrays in Java before? What did you do? just passed an array to println() method and expecting it prints its elements? Me too, but surprisingly array despite beingObjectand providing alengthfield, doesn't seemoverriding the toString() method fromjava.lang.Object class. All it prints istype@somenumber. This is not at all useful for anyone who is interested in seeing whether an array is empty or not, if not then what elements it has etc.

Toprint Java array in a meaningful way, you don't need to look further because your very own Collection framework provides lots of array utility methods injava.util.Arrays class. Here we havetoString() anddeepToString() method to print array in Java.

These methods areoverloaded, much likeSystem.out.println() method to accept all primitive types, which means a different method is called if you pass a boolean array, and a different one is called when youprint integer array.

The same is true withdeepToString(), which is used toprint two-dimensional arrays in Java. In this Java array tutorial, we will see examples of a printingstring array, integer array, byte array and a two-dimensional array in Java. The rest of them are like that, which means by following these examples, you should be able to printboolean,char,short,float,double andlongarray by your own.

How to Print int array in Java - Examples

In order to print an integer array, all you need to do is callArrays.toString(int array) method and pass your integer array to it. This method will take care of the printing content of your integer array, as shown below. If you directly passintarray toSystem.out.println(), you will only see the type of array and a random number.

int[] primes = {5,7,11,17,19,23,29,31,37};System.out.println("Prime numbers : " + primes);System.out.println("Real prime numbers : " + Arrays.toString(primes));//OkOutput:Prime numbers :[I@5eb1404fReal prime numbers : [5,7,11,17,19,23,29,31,37]

How to Print byte array in Java

the printingbytearray is no different than printingintarray, as Arrays class provides an overloaded methodtoString(byte[] bytes) to print contents of byte array in Java, as shown below. By the way, if you want toprint byte array as Hex String then see this link.

String random ="In Java programming langue, array is object";byte[] bytes = random.getBytes();System.out.println("What is inside bytes : " + bytes);System.out.println("Not visible, check closely .." + Arrays.toString(bytes));OutputWhat is inside bytes :[B@31602bbcNot visible, check closely ..[73,110,32,74,97,118,97,32,112,114,111,103,114,97,109,109,105,110,103,32,108,97,110,97,103,117,101,44,32,97,114,114,97,121,32,105,115,32,111,98,106,101,99,116]

How to Print String array in Java

Printing string array in Java is probably the easiest thing to do becauseArraysclass has another overloaded version oftoString() to acceptObject. This method callstoString() of Object to get a printable String. This can also be used toprint the array of any arbitrary object in Java. The user-defined object must override the toString() method to show something reasonable on the console.

String[] buzzwords = {"Java","Android","iOS","Scala","Python"};System.out.println("Buzzing .." + buzzwords);System.out.println("Not buzzing? try again : " + Arrays.toString(buzzwords));Output:Buzzing ..[Ljava.lang.String;@46f5331aNot buzzing?try again : [Java, Android, iOS, Scala, Python]

How to Print Two Dimensional Array in Java

Arrays class provides a different method toprint a two-dimensional array in Java, it’s calledtoDeepString(). It's capable of printing multi-dimensional array in Java and similar totoDeepEquals() which is used to compare multi-dimensional array in Java. This method is also overloaded and provides 8 + 1 primitive and object versions to acceptboolean,byte,short,char,int,long,float,doubleandObjectin Java. Here is an example ofhow to print a two-dimensional array in Java.

String[][] phones = {{"Apple","iPhone"}, {"Samsung","Galaxy"}, {"Sony","Xperia"}};System.out.println("Hot phones .. " + phones);System.out.println("Not hot? See again.." + Arrays.deepToString(phones));OutputHot phones ..[[Ljava.lang.String;@57398044Not hot? See again..[[Apple, iPhone], [Samsung, Galaxy], [Sony, Xperia]]

Complete Java Program to Print Array in Java

This is the full Java code of print different types of arrays in Java. As explained in this article, it prints integer, String, byte, and two-dimensional array usingtoString() anddeepToString() method ofjava.util.Arrays class. 

You can copy-paste this program in your Java IDE and run it. Don't need any third-party libraries.

importjava.util.Arrays;/** * Java Program to print arrays in Java. We will learn how to print String, int, * byte and two dimensional arrays in Java by using toString() and * deepToString() method of Arrays class. * * @author http://java67.blogspot.com */publicclassPrintArrayInJava{publicstaticvoidmain(String args[]) {// Example 1 : print int array in Javaint[] primes = {5,7,11,17,19,23,29,31,37};        System.out.println("Prime numbers : " + primes);// Not OK        System.out.println("Real prime numbers : " + Arrays.toString(primes));//Ok// Example 2 : print String array in Java        String[] buzzwords = {"Java","Android","iOS","Scala","Python"};        System.out.println("Buzzing .." + buzzwords);        System.out.println("Not buzzing? try again : " + Arrays.toString(buzzwords));// Example 3 : print two dimensional array in Java        String[][] phones = {{"Apple","iPhone"}, {"Samsung","Galaxy"},                        {"Sony","Xperia"}};        System.out.println("Hot phones .. " + phones);        System.out.println("Not hot? See again.." + Arrays.deepToString(phones));// Example 4 : print byte array in Java        String random ="In Java programming langue, array is object";byte[] bytes = random.getBytes();        System.out.println("What is inside bytes : " + bytes);        System.out.println("Not visible, check closely .." + Arrays.toString(bytes));    }}Output:Prime numbers :[I@5eb1404fReal prime numbers :[5,7,11,17,19,23,29,31,37]Buzzing ..[Ljava.lang.String;@46f5331aNot buzzing?try again :[Java, Android, iOS, Scala, Python]Hot phones ..[[Ljava.lang.String;@57398044Not hot? See again..[[Apple, iPhone], [Samsung, Galaxy], [Sony, Xperia]]What is inside bytes :[B@31602bbcNot visible, check closely ..[73,110,32,74,97,118,97,32,112,114,111,103,114,97,109,109,105,110,103,32,108,97,110,97,103,117,101,44,32,97,114,114,97,121,32,105,115,32,111,98,106,101,99,116]

That's all abouthow to print array in Java. We have learned how to print objects of an array, instead of an array object, which is nothing but a hashCode. I really hope that Java should add atoString() in Array, instead of providingArrays.toString(), don't know when they chose other parts. 

Nevertheless,toString() andtoDeepString() fromjava.util.Arrays class is sufficient to print any kind of one-dimensional and two-dimensional array in Java. Though special care needs to take, while printing byte arrays, which requires byte to be encoded in Hex string.