How To Change Size Of Array Java

Can yous change size of Array in Java once created?

An array is a data structure/container/object that stores a stock-still-size sequential collection of elements of the same type. The size/length of the array is determined at the fourth dimension of cosmos.

The position of the elements in the array is called as alphabetize or subscript. The starting time element of the array is stored at the index 0 and, the second element is at the index ane and and so on.

Each element in an assortment is accessed using an expression which contains the proper name of the array followed by the index of the required chemical element in square brackets.

For example, if an array of half dozen elements is created with name myArray, you can access the element of the array at alphabetize 3 as −

System.out.println(myArray[3]); //25

Size of an array

In Java, arrays are treated as referenced types you tin can create an assortment using the new keyword similar to objects and populate information technology using the indices every bit −

The size of an array is stock-still, if you lot create an assortment using the new keyword yous demand to specify the length/size of it in the constructor as −

int myArray[] = new int[7]; myArray[0] = 1254; myArray[1] = 1458; myArray[two] = 5687; myArray[3] = 1457; myArray[4] = 4554; myArray[five] = 5445; myArray[vi] = 7524;

You can likewise direct assign values inside flower braces separating them with commas (,) as −

int myArray = {1254, 1458, 5687, 1457, 4554, 5445, 7524}; //size 7

If you create an array by initializing its values directly, the size will exist the number of elements in it.

Thus the size of the array is determined at the time of its creation or, initialization in one case it is done you cannot change the size of the array.

Still if you endeavor to assign value to the element of the array beyond its size a run time exception volition be generated.

Example

In the following case nosotros are creating an array with seven elements and alter we are trying to assign value to the 8th chemical element.

public grade Examination {    public static void main(Cord[] args) {       int myArray[] = new int[vii];       myArray[0] = 1254;       myArray[i] = 1458;       myArray[two] = 5687;       myArray[iii] = 1457;       myArray[iv] = 4554;       myArray[five] = 5445;       myArray[six] = 7524;       myArray[7] = 4238;       Organization.out.println(Arrays.toString(myArray));    } }

Run fourth dimension error

Exception in thread "chief" coffee.lang.ArrayIndexOutOfBoundsException: 7 at Test.principal(Examination.java:13)

Changing the size of an array

You can modify the size of the existing array by reassigning information technology to the new one equally −

Example

import coffee.util.Arrays; public class Test {    public static void main(String[] args) {       int myArray[] = new int[7];       myArray[0] = 1254;       myArray[i] = 1458;       myArray[two] = 5687;       myArray[three] = 1457;       myArray[4] = 4554;       myArray[5] = 5445;       myArray[6] = 7524;       Organisation.out.println(Arrays.toString(myArray));       myArray = new int[8];       myArray[0] = 1254;       myArray[1] = 1458;       myArray[two] = 5687;       myArray[3] = 1457;       myArray[4] = 4554;       myArray[5] = 5445;       myArray[6] = 7524;       myArray[7] = 3165;       Organisation.out.println(Arrays.toString(myArray));    } }

Output

[1254, 1458, 5687, 1457, 4554, 5445, 7524] [1254, 1458, 5687, 1457, 4554, 5445, 7524, 3165]

In this scenario the earlier array object will be left out for garbage collection. Thus, when used extensively this approach causes memory issues therefore, it is non recommended.

Published on 02-Aug-2019 14:26:49

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