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Java int Array - int Array in Java

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int Array in Java

int Array

Java int Array

Java int array is used to store int data type values only. The default value of the elements in a int array is false.

With the following Java int array examples you can learn

  • how to declare Java int array
  • how to assign values to Java int array
  • how to get values from Java int array

Initializing a int Array in Java

Arrays are declared with [] (square brackets). If you put [] (square brackets) after any variable of any type only that variable is of type array remaining variables in that declaration are not array variables those are normal variables of that type.

If you put [] (square brackets) after any data type all the variables in that declaration are array variables. All the elements in the array are accessed with index. The array element index is starting from 0 to n-1 number i.e. if the array has 5 elements then starting index is 0 and ending index is 4.

// declares an array of ints
int[] intArray;

What is the Length of an Array in Java ?

In Java all the arrays are indexed and declared by int only. That is the size of an array must be specified by an int value and not long or short. All the arrays index beginning from 0 to ends at 2147483646. You can store elements upto 2147483647. If you try to store long (big) elements in array, you will get performance problems. If you overcome performance problems you should go to java collections framework or simply use Vector.

Syntax :

< data type > < variable >[];
< data type >[] < variable >;

Java int Array Example

Following example shows Java int Array . Save the following Java int Array example program with file name JavaIntArrayExample.java .

public class JavaIntArrayExample
{
	public static void main(String args[])
	{
		// JAVA INT ARRAY DECLARATION
		int n[];
		// MEMORY ALLOCATION FOR JAVA INT ARRAY
		n = new int[4];
		// ASSIGNING ELEMENTS TO JAVA INT ARRAY
		n[0] = 5;
		n[1] = 3;
		n[2] = 4;
		n[3] = 7;
		// JAVA INT ARRAY OUTPUT
		System.out.println("Java int Array Example");
		for(int i=0;i<n.length;i++)
		{
			System.out.println("Element at Index : "+ i + " " + n[i]);
		}
	}
}

Related : Java boolean Array

How to assign values to java int array at the time of declaration ?

Following Java int array example you can learn how to assign values to java int array at the time of declaration.

Following example shows How to assign values to java int array at the time of declaration . Save the following assign values to java int array at the time of declaration example program with file name AssignValuesToIntArray.java .

Assign values to java int array at the time of declaration Example

public class AssignValuesToIntArray
{
	public static void main(String args[])
	{
		int n[] = {5,3,4,7};
		System.out.println("Java int Array Example");
		for(int i=0;i<n.length;i++)
		{
			System.out.println("Element at Index : "+ i + " " + n[i]);
		}
	}
}

Related : Java byte Array

How to declare Java int array with other Java int variables ?

Following Java int array example you can learn how to declare Java int array with other Java int variables.

Following example shows How to declare Java int array with other Java int variables . Save the following declare Java int array with other Java int variables example program with file name DeclareIntArrayWithIntVariables.java .

Declare Java int array with other Java int variables Example

public class DeclareIntArrayWithIntVariables
{
	public static void main(String args[])
	{
		// JAVA INT ARRAY DECLARATION
		// n IS AN ARRAY n2 IS NOT AN ARRAY
		int n[], n2;
		n = new int[4];
		n[0] = 5;
		n[1] = 3;
		n[2] = 4;
		n[3] = 7;
		n2 = 555;
		System.out.println("Java int Array Example");
		System.out.println("n2 value is : "+n2);
		for(int i=0;i<n.length;i++)
		{
			System.out.println("Element at Index : "+ i + " " + n[i]);
		}
	}
}

Related : Java char Array

Following Java int array example you can learn how to assign Java int array to other Java int array.

Following example shows How to assign Java int array to other Java int array . Save the following assign Java int array to other Java int array example program with file name AssignIntArrayToIntArray.java .

Assign Java int array to other Java int array Example

public class AssignIntArrayToIntArray
{
	public static void main(String args[])
	{
		int[] n, n2;
		n = new int[4];
		n[0] = 5;
		n[1] = 3;
		n[2] = 4;
		n[3] = 7;
		// ASSIGNING n ARRAY TO n2 ARRAY VARIABLE
		n2 = n;
		System.out.println("Java int Array Example");
		System.out.println("n array values");
		for(int i=0;i<n.length;i++)
		{
			System.out.println("Element at Index : "+ i + " " + n[i]);
		}
		System.out.println("n2 array values");
		for(int i=0;i<n2.length;i++)
		{
			System.out.println("Element at Index : "+ i + " " + n2[i]);
		}
	}
}

Related : Java short Array