Array set() method in Java
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
Return type : This is a void type method this doesn’t returns any value. The update reflects upon the Object array passed as the argument.
Exception : This method throws following exception.
- 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 :
import java.lang.reflect.Array;
public class GfG {
public static void main(String[] args)
{
String s[] = { "Geeks" , "is" , "Geeks" };
System.out.print( "Before Set : " );
for (String x : s) {
System.out.print(x);
}
Array.set(s, 1 , "for" );
System.out.print( "\nAfter Set : " );
for (String x : s) {
System.out.print(x);
}
}
}
|
Output:
Before Set : GeeksisGeeks
After Set : GeeksforGeeks
Program 2 : to demonstrate java.lang.NullPointerException
import java.lang.reflect.Array;
public class GfG {
public static void main(String[] args)
{
String s[] = null ;
try {
Array.set(s, 1 , "for" );
}
catch (Exception e) {
System.out.println( "Exception : " + e);
}
}
}
|
Output:
Exception : java.lang.NullPointerException
Program 3 : to demonstrate java.lang.ArrayIndexOutOfBoundsException
import java.lang.reflect.Array;
public class GfG {
public static void main(String[] args)
{
String s[] = { "Geeks" , "for" , "Geeks" };
try {
Array.set(s, 4 , "for" );
}
catch (Exception e) {
System.out.println( "Exception : " + e);
}
}
}
|
Output:
Exception : java.lang.ArrayIndexOutOfBoundsException
Program 4 : to demonstrate java.lang.IllegalArgumentException
import java.lang.reflect.Array;
public class GfG {
public static void main(String[] args)
{
String s = "GeeksforGeeks" ;
try {
Array.set(s, 4 , "for" );
}
catch (Exception e) {
System.out.println( "Exception : " + e);
}
}
}
|
Output:
Exception : java.lang.IllegalArgumentException: Argument is not an array
Last Updated :
10 Nov, 2022
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