How can create the object ? Via class.forName

Question

Hi,
i want to create the object via class.forname?........
i have tryed like this Class obj=Class.forName("sample.Employee");
but it gives error like this......
java.lang.InstantiationException: sample.Employee
     at java.lang.Class.newInstance0(Class.java:291)
     at java.lang.Class.newInstance(Class.java:259)
     at sample.ArrayListTest.main(ArrayListTest.java:22)

Answer 1

The line
Class obj=Class.forName("sample.Employee");does NOT create a new object of class
sample.Employee. It only loads the class and creates
the Class object. You have to call newInstance() to
create a new instance of the class:
Object obj =
Class.forName("sample.Employee").newInstance();I guess you already did something like that, because
forName() itself doesn't throw an
InstantiationException.
For this to work, class sample.Employee must be in
the classpath and it must have a public constructor
that takes no arguments.this is my full code it dosn't work i don,t know
public class ArrayListTest {
public ArrayListTest() {  }
public static void main(String[] args) {
ArrayList employees = new ArrayList();
// create some employees
/* Employee employee_1 = new Employee("John", 2000);
Employee employee_2 = new Employee("Carl", 3000);
Employee employee_3 = new Employee("Ron", 4000);*/
/*instead of this Employee employee_1 i want to create the new obeject by using*/
try{
Object obj = Class.forName("sample.Employee").newInstance();
catch(Exception e)
e.printStackTrace();
// add them to your list
//employees.add(employee_1);
//employees.add(employee_2);
//employees.add(employee_3);
// display only the names your list
for(int j = 0; j < employees.size(); j++) {
Employee temp = (Employee)employees.get(j);
System.out.println("nr. "+(j+1)+": "+temp.getName()+"\nnr. "+(j+1)+": "+temp.getSalary());
// invoke the toString()-method from Employee
for(int j = 0; j < employees.size(); j++) {
Employee temp = (Employee)employees.get(j);
System.out.println(temp.toString());
} // class ArrayListTest
again the same error occur................