How can I call a class constructor if I only have the class name as variable.

NOAM NA = new NOAM();

instead of using NOAM() I want to use a variable that will be the same as using NOAM() constructor.

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You mean that you have the String"NOAM" and you want to create an instance of that class? Use Class.forName() and then call newInstance() on the found class, like this:

String className = "NOAM"; // Must be full name, including package name

try {
   Class c = Class.forName(className);
   Object instance = c.newInstance();
   System.out.println(instance.getClass().getName()); // should print "NOAM"
catch (ClassNotFoundException e) {
   // classname not found
catch (InstantiationException e) {
   // classname represents an abstract class, an interface, an
  // array class, a primitive type, or void; or if the
  //  instantiation fails for some other reason
catch (IllegalAccessException e) {
   // the class or initializer is not accessible.

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