JAVA REFLECTION

Code:


I have the following class.

package pd.tutorials.practice;

public class Employee {

public String name;

public double salary;

public int age;

public String employeeId;

static{

System.out.println("static block called");

}

public Employee()

{

System.out.println("Employee constructor called");

}

public Employee(String name1, double salary, int age, String employeeId)

{

name = name1;

this.salary = salary;

this.age = age;

this.employeeId = employeeId;

}

//overriden method

public String toString() {

return name + ", " + salary + ", " + age + ", " + employeeId;

}

}

package pd.tutorials.practice;

public class TryCollections {

public static void main(String a[]) {

try {

                        // loads the class. calls static block

Class.forName("pd.tutorials.Employee");

//define type of constructor a class may have

Class[] paramType = {String.class, Double.TYPE, 

Integer.TYPE, String.class};

//asking if the class has the constructor type defined above

Constructor<Employee> con = Employee.class.getConstructor(paramType);

System.out.println("No error means...found the constructor");

//if constructor is found, create values to pass to constructor

Object [] paramValues = {"Pratik Dave",

new Double(10000), 

30,

"539622"

};

// calls the constructor

Employee emp = con.newInstance(paramValues);

System.out.println(emp.age);

} catch (Exception ex) {

ex.printStackTrace();

}

}

}