No Argument Constructor Example
In this section you will
learn how to know that whether any class consists No-Argument Constructor
or not ?. Here is an example that provides the usage
of the newInstance() method in more detail.
Here in our example we have
used "forName()" static
method of Class and then we have invoked newInstance() method to
create a new object without any argument. Invoking
newInstance() method throws a NoSuchMethodException if the class
does not have any no-argument constructor.
Here is code for example:
NoArgConstructor.java
import java.lang.reflect.*;
import java.util.ArrayList;
public class NoArgConstructor {
public static void main(String str[]){
try{
ArrayList list = (ArrayList)
(Class.forName("java.util.ArrayList").newInstance());
System.out.println("No-Argument Constructor exist.");
System.out.println("New Object created Successfully");
}catch(Exception e){
System.out.println("No-argument constructor does not exist.");
System.out.println(e.getMessage());
}
}
}
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Output:
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