Run Time Type Information snippet (RTTI – Java)
May 10, 2016
Categorised in: Java Codes
//************************* Manager.java *************************
public class Manager extends Employee {
public Manager(int empId, String empName) {
super(empId, empName);
}
public void salary(){}
public void bonus(){}
}
//************************* Employee.java *************************
public class Employee {
//Run Time Type Info
int empId;
String empName;
public Employee(int empId, String empName) {
this.empId = empId;
this.empName = empName;
}
public void fun(){}
public void test(){}
@Override
public String toString() {
return "ID: " + empId + " Employee Name: "+empName ;
}
}
//************************* Main.java *************************
import java.lang.reflect.Method;
public class Main {
public static void main(String[] args) {
Employee employee1 = new Employee(111, "Patrick");
System.out.println(employee1);
Employee employee2 = new Employee(112, "Pratik");
System.out.println(employee2);
//RTTI
Class myClass; //This is provided by java
myClass = employee1.getClass(); //This stores the reference's classname
System.out.println("Class Name: " + myClass.getClass().getName());
System.out.println("--------------------------");
System.out.println("Now we change reference of employee");
System.out.println("--------------------------");
Employee employee = new Manager(113, "Code");
myClass = employee.getClass();
System.out.println("Class Name: " + myClass.getClass().getName());
System.out.println("Super Class Name: " + myClass.getSuperclass().getName());
//Now for printing methods name
Method[] methods = employee.getClass().getMethods();
for (int i = 0; i < methods.length; i++) {
System.out.println("Method Name: " + methods[i].getName());
}
}
}
Output:
ID: 111 Employee Name: Patrick
ID: 112 Employee Name: Pratik
Class Name: java.lang.Class
————————–
Now we change reference of employee
————————–
Class Name: java.lang.Class
Super Class Name: Employee
Method Name: salary
Method Name: bonus
Method Name: toString
Method Name: test
Method Name: fun
Method Name: wait
Method Name: wait
Method Name: wait
Method Name: equals
Method Name: hashCode
Method Name: getClass
Method Name: notify
Method Name: notifyAll
Pratik Kataria is currently learning Springboot and Hibernate.
Technologies known and worked on: C/C++, Java, Python, JavaScript, HTML, CSS, WordPress, Angular, Ionic, MongoDB, SQL and Android.
Softwares known and worked on: Adobe Photoshop, Adobe Illustrator and Adobe After Effects.