Array get() Method in Java - GeeksforGeeks

23 Jul, 2020
The java.lang.reflect.Array.get() is an inbuilt method in Java and is used to return the element at a given index from the specified Array.
Syntax
Array.get(Object []array, int index)

Parameters : This method accepts two mandatory parameters:
array: The object array whose index is to be returned.
index: The particular index of the given array. The element at ‘index’ in the given array is returned.
Return Value: This method returns the element of the array as type of Object class.
Exceptions: This method throws following exceptions:
NullPointerException – when the array is null.
IllegalArgumentException – when the given object array is not an Array.
ArrayIndexOutOfBoundsException – if the given index is not in the range of the size of the array.
Below programs illustrate the get() method of Array class:
Program 1:
import java.lang.reflect.Array;  public class GfG {    // main method    public static void main(String[] args)    {        // Declaring and defining an int array        int a[] = { 1, 2, 3, 4, 5 };          // Traversing the array        for (int i = 0; i < 5; i++) {              // Array.get method            // Note : typecasting is essential            // as the return type in Object.            int x = (int)Array.get(a, i);              // Printing the values            System.out.print(x + " ");        }    }}
1 2 3 4 5

Program 2: To demonstrate ArrayIndexOutOfBoundsException.
import java.lang.reflect.Array;  public class GfG {    // main method    public static void main(String[] args)    {        // Declaring and defining an int array        int a[] = { 1, 2, 3, 4, 5 };          try {            // invalid index            int x = (int)Array.get(a, 6);            System.out.println(x);        }        catch (Exception e) {            // throws Exception            System.out.println("Exception : " + e);        }    }}
Exception : java.lang.ArrayIndexOutOfBoundsException

Program 3: To demonstrate NullPointerException.
import java.lang.reflect.Array;  public class GfG {    // main method    public static void main(String[] args)    {        // Declaring an int array        int a[];          // array to null        a = null;          try {            // null Object array            int x = (int)Array.get(a, 6);            System.out.println(x);        }        catch (Exception e) {            // throws Exception            System.out.println("Exception : " + e);        }    }}
Exception : java.lang.NullPointerException

Program 4: To demonstrate IllegalArgumentException.
import java.lang.reflect.Array;  public class GfG {    // main method    public static void main(String[] args)    {        // int (Not an array)        int y = 0;          try {            // illegalArgument            int x = (int)Array.get(y, 6);              System.out.println(x);        }        catch (Exception e) {            // Throws exception            System.out.println("Exception : " + e);        }    }}
Exception : java.lang.IllegalArgumentException: Argument is not an array

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Java - util package
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