Are you curious to know how to print an array in Java? Have you ever considered the standard procedures for printing an array in Java? Your search ends here as the most detailed article on Array Printing in Java is now at your fingertips.
If you have just completed your basic journey in Java Programming Language, then the Array Concept can be the best host to welcome you to the Intermediate Level of Java. Once, the Array concept clears to you, the door of Data Structures will also be opened for you.
This article is all about arrays and the array elements. We will see how we can print arrays in Java with the help of coding examples that will further clear your doubts. So, let’s get started!
Summary or Key Highlights:ย
An Array is a Data Structure that helps to store similar kinds of data elements. It can store Integer, String, and Float values at a time.
Array concept falls under the Static Data Structure where the size can’t be changed.
Printing ways are categorized based on the Array Type used in the program. Printing of String Array in the normal process is not possible in Java.
There are many ways among them four are most suitable for printing Java Array. We can either use loops or interfaces for it.
What Is Array In Java? Know More
Like other programming languages, Java array can only be able to store similar types of data. This means, that if the programmer declares an array as an integer array, then it can only able to accept the integer value. We canโt able to store the character in a certain array.
In Java, there are two types of arrays present. One is theย One Dimension array & the other is the Multi Dimension Array. One Dimension Array means it can only able to store a single line of data. A Multidimensional Arrayย means it can able to store multi-line information.
An array is different from the List. A list can able to store different types of data in a single list. However, the array is only meant to store a similar type of data. Still have no clue about the topic and you want to hire a Java programmerย for you then you can contact us for the best Java help.
What Are The Methods To Print An Array In Java?
After knowing the basics of Java array, now it is time to know how to print an array in Java. For that purpose, there are some Java array methods present. Some apply to One Dimension Arrays & some to Multidimensional Arrays. Letโs make a list of those methods:
- Using Loop Method
- Converting To String Method
- Converting To the Deep String Method
Letโs look at each method one by one.
How To Print An Array In Java Using Loop Method?
Now, the very first method will use the loop concept of Java programming. There are two potential loop methods present in Java that can be utilized for array printing purposes. The two main loop methods are the For Each loop and For Loop.
You should be aware of the differences between the For Each Loop and Normal For Loop. Using both methods we are going to create a Java program that will focus on the Array printing process.
How To Print A Java Array Using For Each Loop Method?ย
Here, the simple For Each Loop will be utilized. The method will pick up each one of the objects from the array and print it in the program. Whatever, elements are present in the array will all get printed. Also, the use of tricky printing statements will be utilized.
Program To Define The Use Ofย For Each Loop To Print Java Array:
public class Main
{
public static void main(String[] args)
{
// Declaring One Array
int[] a = {10,20,30,40,50};
// Running For Each Loop
for(int i: a)
{
// Printing Each Value With Space
System.out.print(i+" ");
}
}
}
Steps Of The Program:ย
- One single-dimensional array will be declared and some values will be provided there.
- Now, the for each loop will be used along with one variable that is pointing towards the array name.
- Now, each one of the values will be printed and one space will also be inserted after the printed value.ย
Letโs look at the output of the above code. Hence, we come to know how to print an array in Java.
Output:
From the above output, we can see that some numbers are printed in the output window. These are the numbers present in the array. So, the For Each Loop is working perfectly as the required output is coming in the output window.
How To Print A Java Array Using Normal For Loop Method?
Now, after the For Each Loop method, it is time to demonstrate the use of the Normal For Loop method for printing the values in the array. The use of the Normal For Loop will be quite different from the use of For Each Loop.
Program To Define The Use Of Normal For Loop To Print Java Array:
public class Main
{
public static void main(String[] args)
{
// Declaring One Array
int[] a = {10,20,30,40,50};
// Taking The Length Of The Array
int i, j=a.length;
for(i=0; i<j; i++)
{
// Printing Each Value With Space
System.out.print(a[i]+ " ");
}
}
}
Steps Of The Program:ย
- A one-dimensional array will be declared along with some values.
- Now, the length of the array will be stored in one variable.
- Now, the For Loop will be declared. The For Loop will run from the Zero Index to the Length of Array.
- For each iteration, the Loop will print the value of the array along with some spaces to make the gap between the values.
Letโs look at the output of the above code. Hence, we come to know how to print an array in Java.
Output:
From the above output, we can see that the Values of the Java array are printed in the output window. All the values are printed with some spaces as defined in the printing statements. So, the Java Code is compiled successfully.ย
How To Print An Array In Java In One Line?
It is one of the simplest programs to print Java Array without having any such issues. However, no Java program can be concluded within one line. But the following program will take one necessary punch line to complete the entire program.
The central theme of the program is to convert an array to a string. Now, we have to print the string which is recently converted and all of our tasks will get done.ย
General Syntax: Arrays.toString(arrayname)
Program To Print Java Array By Converting To String Concept:
import java.util.Arrays;
public class Main
{
public static void main(String[] args)
{
// Declaring One Array
int[] a = {10,20,30,40,50};
// Converting To String or List From Array
System.out.println(Arrays.toString(a));
}
}
Steps Of The Program:ย
- At first, one necessary package will be called into the program. The package belongs to the Array classes that help to gain some more inbuilt packages.
- Now, one single-dimensional array will be declared along with some values.
- Now, the above-mentioned syntax will be used that will fully convert the array to the string.
- Along with that, the string will get printed on the output as well.
Letโs look at the output of the above code. Hence, we come to know how to print an array in Java.
Output:
From the above output, we can see that the values in the array are now printed on the screen. However, the brackets can also be visible as the entire array is converted. And in one array, the brackets are also necessary.
If youโre facing any difficulties checking if an array contains a given value using Java, then you can check out our article, weโve mentioned various methods to tackle these difficulties.
How To Print An 2D Array In Java?
This method is only used for Multidimensional Arrays. That means the arrays where 2 or more dimensions are present can only be used for this case. Here, the 2D array will be used where under a big array, some small arrays are inserted.
In this case, also the string will not be the traditional string we are used to seeing. It will be a List-like structure. In this structure, there will be two brackets at two ends of the structure. Also, this structure will make the multidimensional array an acceptable form. This form helps to do more work easily.
Also, you must be aware ofย comparing 2 strings in Java if you have covered Strings. If not, then weโve written a detailed article on it.
General Syntax: Arrays.deepToString(arrayname)
Program To Demonstrate The Use Of Deep String Method In Java Array:
import java.util.Arrays;
public class Main
{
public static void main(String[] args)
{
// Declaring One Array
int[][] a = {{10,20},{30,40},{50}};
// Converting To String or List From Multi dimension Array
System.out.println(Arrays.deepToString(a));
}
}
Steps Of The Program:ย
- At first, the necessary package to deal with the Java Array will be called in the program.
- Now, one 2D array will be declared along with some values. We have to place the brackets carefully for the 2D Array.
- Now, according to the above syntax we have to declare the function. Also, we have to provide the array name to the function.
- It will print the entire array in the output window.
Letโs look at the output of the above code. Hence, we come to know how to print an array in Java.
Output:
From the above output, we can see that the array values are printed in the output in the proper order. Also, the brackets of each value are placed in the right manner. So, the complete code works successfully and easily.
How Print String Array In Java?
Printing the string array in Java is not possible at all. If you want to print the String values in an array using Java programming language, we will find an error as it is not legal in Java. So, the trick is to convert the entire array to the string.
And you should know which method we have to use for such Array to String conversion!
Program To Print String Array In Java Using the Array To String Method:
import java.util.Arrays;
public class Main
{
public static void main(String[] args) {
String a[] = { "Coding", "Zap", "Tech" }; // One Dimensional Array
System.out.println("Array Values: " + Arrays.toString(a)); // Printing String Array
}
}
Steps Of The Program:ย
- The necessary array package will be imported into the program to use the ToString() function.
- Now, one 1D Array will be declared where only string values can be stored.
- Now, using the ToString() value, the array will be converted to one string.
- And the entire string will get printed.
Let us have a look at the output of the above program. It will increase your understanding.
Output:ย
From the above output, we can see that the string values that are stored in the array are not printed on the screen. This is only possible as the entire array is now converted to one string. And printing string is not a big deal in Java.
How To Print Long Array In Java?
Don’t get confused with the heading of the question! We are not referring to a big array in Java. Rather we are talking about one array where the values are categorized as the Long Data Type which is a similar thing with Integer values.
We can handle such issues efficiently with the Loop method. We will use the For Each method in this case.
Program To Demonstrate The Process To Print Long Array In Java Language:
public class Main
{
public static void main(String[] args) {
// Declaring One Array
long[] a = { 101L, 202L, 303L, 404L};
// Running For Each Loop
for(long i: a)
{
// Printing Each Value With Space
System.out.print(i+" ");
}
}
}
Steps Of The Program:ย
- One array will be declared as the Long Data Type and all the values will have the Long symbol.
- Now, the For Each loop will be initialized.
- The variable in the For Each loop will also be categorized under the Long Format.
- Now, as usual, the For Each loop will get executed.
Let us have a look at the following output coming by executing the above code. It will help to clarify the concept more.
Output:ย
Why We Use Array In Java?
At the end of our discussion, it is a necessity to put light upon the need for arrays in Java. This final touch will increase your capability to grab the concept more preciously. For before concluding, we would like to discuss some of the necessities of Java Array.
The necessities or needs of the Java arrays are the following. We have to check each one of the points.
- To Store Items: The array concept in Java programming language helps to store similar kinds of data within a single variable. We don’t have to declare multiple variables for each value. This helps to reduce the space consumption of the code. Like, Dynamic arraysย allow elements to be added and removed at runtime.
- Easy To Access: The elements stored in the Java array can easily be accessed with the help of the index numbers. The array starts with the predefined index number Zero. To access the Second Element, index number One will be used.
- Improve Performance: The Array helps to improve the overall performance of the code. If the array is used properly, it can reduce the Space and Time Complexity of the code. And this is the great symbol of every program.
Conclusion:
As we saw printing an array in Java is very important. It is a very important feature that helps to provide the output in a good manner form.
So, it is advisable to use the Loop method instead of converting it to the string method, this will create trouble with the brackets available at the ends of the output.
Takeaways:ย
- The Loop Method can be the best process to print the values of any Java Array.
- Along with the Integer format, the Long Data Type can also be printed using the loop method.
- To complete the process in short, conversion to String can also be one alternative.
- For 1D arrays, the ToString() Method will be utilized.
- For 2D arrays, the Deep String Method is used.
- Reversing of the String can be done with some inbuilt functions present in Java.
- Array helps to store similar types of data in the continuous memory block to save time.
