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You can use the Class
class to create a new instance of a specified class, by
calling its newInstance()
method:
package reflection;
public class NewInstanceTest
{
public static void main(String[] args)
{
try
{
Class empClass = Employee.class;
Employee emp = (Employee) empClass.newInstance();
emp.init("Eugene McCracken", 34, 45000, 45678);
System.out.println("Name: " + emp.getName());
Class mgrClass = Class.forName("reflection.Manager");
Manager mgr = (Manager) mgrClass.newInstance();
mgr.init("Pietro Botticelli", 385, 50000000, 675978);
System.out.println("Name: " + mgr.getName());
}
catch(ClassNotFoundException e)
{
System.err.println("Class not found");
}
catch(InstantiationException e)
{
System.err.println("Failed to instantiate");
}
catch(IllegalAccessException e)
{
System.err.println("Unable to access class");
}
}
}
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which produces the following output:
Name: Eugene McCracken
Name: Pietro Botticelli
The first created instance used a mechanism that depends on the class already
having been loaded into the JVM.
The second created instance used the forName() method, which allows you to
explicitly load a class (using its fully qualified name) before instantiating
it. The only requirement here is that the class must exist in the class
path.
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