Question

Core Java

Do exercise 9a, 9b, 9c, & 9d with indented code and comments.

9a. public class Demo {               public static void main(String[] args) {                             //create Employee object with int 101, String Sam,salary 1000 data                             //display this object data by passing to show method                             //add 100 bonus in salary                             //display this object data by passing to show method               }               public static void show(){                             //do required changes in show method               } }

9b. public class Demo {               public static void main(String[] args) {                             //create Employee object with int 101, String sam, salary 1000 data                             //display this object data by passing to show method                             //add 100 bonus in salary                             //display this object data by passing to show method               }               public void show(){                             //do required changes in show method               } }

9c. In below example ,try to call show method in different ways which explains different ways to call static methods public class Demo {               public static void main(String[] args) {                             //call show method in different ways               }               public static void show(){                             System.out.println("show method");               } }

9d. In below example, try to print total variable in different ways which explains different ways to call static variable public class Demo {               private static int total = 10;               public static void main(String[] args) {                             //print total in different ways               } }

Answer 1

Code For 9a:

public class Demo {

        public static void main(String[] args) {

                // create Employee object with int 101, String Sam,salary 1000 data
                
                Employee e=new Employee(101,"Sam",1000);

                // display this object data by passing to show method
                show(e);

                // add 100 bonus in salary
                e.salary+=100;
                
                // display this object data by passing to show method
                show(e);

        }
        
        //Method to display employee details
        public static void show(Employee e) {
                System.out.println("\nEmployee Details: ");
                System.out.println("Id: "+e.id);
                System.out.println("Name: "+e.name);
                System.out.println("Salary: "+e.salary);

        }
}


//Employee Class required to create employee object 
class Employee {
        int id;
        String name;
        double salary;
        public Employee(int id, String name, double salary) {
                super();
                this.id = id;
                this.name = name;
                this.salary = salary;
        }
}

Output Of Above Code:

Employee Details: 
Id: 101
Name: Sam
Salary: 1000.0

Employee Details: 
Id: 101
Name: Sam
Salary: 1100.0

Code For 9b:

public class Demo {

        public static void main(String[] args) {

                // create Employee object with int 101, String sam,salary 1000 data
                
                Employee e=new Employee(101,"sam",1000);

                // display this object data by passing to show method
                show(e);

                // add 100 bonus in salary
                e.salary+=100;
                
                // display this object data by passing to show method
                show(e);

        }
        
        //Method to display employee details
        public static void show(Employee e) {
                System.out.println("\nEmployee Details: ");
                System.out.println("Id: "+e.id);
                System.out.println("Name: "+e.name);
                System.out.println("Salary: "+e.salary);

        }
}

//Employee Class required to create employee object 
class Employee {
        int id;
        String name;
        double salary;
        public Employee(int id, String name, double salary) {
                super();
                this.id = id;
                this.name = name;
                this.salary = salary;
        }
}

Output Of Above Code:

Employee Details: 
Id: 101
Name: sam
Salary: 1000.0

Employee Details: 
Id: 101
Name: sam
Salary: 1100.0

Code For 9c:

public class Demo {

        public static void main(String[] args) {

                //Using Class Name
                System.out.println("* * * Using Class Name * * * ");
                Demo.show();
                System.out.println("* * * Without any references * * *  ");
                show();
                System.out.println("* * * Using Object reference * * * ");
                Demo d=new Demo();
                d.show();

        }

        public static void show() {

                System.out.println("show method");

        }
}

Output Of Above Code:

* * * Using Class Name * * * 
show method
* * * Without any references * * *  
show method
* * * Using Object reference * * * 
show method

Code For 9d:

public class Demo {

        private static int total = 10;

        public static void main(String[] args) {
                
                System.out.println("* * * Using Class name * * *");
                System.out.println(Demo.total);
                
                System.out.println("* * * Without Any reference * * *");
                System.out.println(total);
        
                
                System.out.println("* * * Using Object reference * * *");
                Demo d=new Demo();
                System.out.println(d.total);
        }

}

Output Of Above Code:

* * * Using Class name * * *
10
* * * Without Any reference * * *
10
* * * Using Object reference * * *
10

Images Of Code:

Image Of Code 9a:

Image Of Code 9b:

Image Of Code 9c:

Image Of Code 9d:

Output Images:

Output Image Of 9a:

Output Image Of 9b:

Output Image Of 9c:

Output Image Of 9d: