Array set() method in Java
Last Updated :
10 Nov, 2022
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The java.lang.reflect.Array.set() is an inbuilt method in Java and is used to set a specified value to a specified index of a given object array.
Syntax
Array.set(Object []array, int index, Object value)Parameter :
- array : This is an array of type Object which is to be updated.
- index : This is the index of the array which is to be updated.
- value : This is the value that is to be set at the given index of the given array
- 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 Array.set() method: Program 1 :
// Java code to demonstrate set() method of Array class
import java.lang.reflect.Array;
public class GfG {
// main method
public static void main(String[] args)
{
// Declaring and defining a String array
String s[] = { "Geeks", "is", "Geeks" };
System.out.print("Before Set : ");
// printing the array
for (String x : s) {
System.out.print(x);
}
// set method of class Array
Array.set(s, 1, "for");
System.out.print("\nAfter Set : ");
// printing array
for (String x : s) {
System.out.print(x);
}
}
}
Output:
Program 2 : to demonstrate java.lang.NullPointerException
Before Set : GeeksisGeeks After Set : GeeksforGeeks
// Java code to demonstrate set() method of Array class
import java.lang.reflect.Array;
public class GfG {
// main method
public static void main(String[] args)
{
// Declaring and defining a String array
String s[] = null;
try {
// set method of class Array
Array.set(s, 1, "for");
}
catch (Exception e) {
System.out.println("Exception : " + e);
}
}
}
Output:
Program 3 : to demonstrate java.lang.ArrayIndexOutOfBoundsException
Exception : java.lang.NullPointerException
// Java code to demonstrate set() method of Array class
import java.lang.reflect.Array;
public class GfG {
// main method
public static void main(String[] args)
{
// Declaring and defining a String array
String s[] = { "Geeks", "for", "Geeks" };
try {
// set method of class Array
Array.set(s, 4, "for");
}
catch (Exception e) {
System.out.println("Exception : " + e);
}
}
}
Output:
Program 4 : to demonstrate java.lang.IllegalArgumentException
Exception : java.lang.ArrayIndexOutOfBoundsException
// Java code to demonstrate set() method of Array class
import java.lang.reflect.Array;
public class GfG {
// main method
public static void main(String[] args)
{
// Declaring and defining a String array
String s = "GeeksforGeeks";
try {
// set method of class Array
Array.set(s, 4, "for");
}
catch (Exception e) {
System.out.println("Exception : " + e);
}
}
}
Output:
Exception : java.lang.IllegalArgumentException: Argument is not an array
