Question

Create a generic method to print objects in java. Include a tester class.

Answer 1

Here we will create a class employee and we will declare instance variables for the class along with getter and setter.

All the comments are written in he codes to have a better understanding of the program.

We have two classes :-

1. Employee

2. Tester

In tester class we have created a generic method to call the objects of the employee class.

Codes for the employee class:

public class Employee {

        //Instance variables of the class
        private Integer id;
        private String name;

        //Setter and getter methods for the instance variables
        public Integer getId() {
                return id;
        }

        public void setId(Integer id) {
                this.id = id;
        }

        public String getName() {
                return name;
        }

        public void setName(String name) {
                this.name = name;
        }

        //override the toString class for a better and customised output view
        @Override
        public String toString(){
                return "Employee ID = " + id +", name = " +name;
        }
}

Codes for the Tester class:

public class Tester {
        public static void main(String[] args){
                //Creating 2 objects of employee class
                Employee e1 = new Employee();
                e1.setId(123);
                e1.setName("Danny");

                Employee e2 =new Employee();
                e2.setId(1234);
                e2.setName("Robert");

                //creating an array of Employee and assigning the objects of employee to it
                Employee empArray[] =new Employee[2];
                empArray[0]= e1;
                empArray[1]= e2;

                //calling the display method which is a generic method to display the objects of the class.
                display(empArray);
        }

        //creation of the generic method named display which takes an array as a parameter.
        private static <E> void display(E[] elements){
                for (E e: elements) {
                        System.out.println(e);
                }
        }
}

All the comments are written in the program for better understanding

The output of the program: