Java Practical No.19.pdf

19.1) DEMONSTRATE THE USE OF INTERFACES TO IMPLEMENT THE CONCEPT OF MULTIPLE INHERITANCE. PROGRAM: import java.util.*; class student { Scanner s=new Scanner(System.in); int rn;

void get() { System.out.println("Enter the rollno:"); rn=s.nextInt(); } void put() { System.out.println("Rollno:"+rn); } } class test extends student { int part1,part2;

void get1() { System.out.println("Enter the marks of part1 and part2:"); part1=s.nextInt(); part2=s.nextInt(); }

void put1() { System.out.println("part 1:"+part1); System.out.println("part2:"+part2); } } interface sports { int sportswt=10; void put2(); } class result extends test implements sports { int total; void cal() { total=part1+part2; } void display() { System.out.println("Total:"+total); } public void put2() { System.out.println("Sports wicket:"+sportswt); } } class sportsDemo {

public static void main(String args[]) { result r=new result(); r.get(); r.put(); r.get1(); r.put1(); r.cal(); r.display(); r.put2(); } } OUTPUT:

19.2) DEVELOP A PROGRAM TO FIND AREA OF RECTANGLE AND CIRCLE USING INTERFACES. PROGRAM: import java.util.*; interface shape { Scanner s=new Scanner(System.in);

void get(); void put(); } class circle implements shape { int r; float pi=3.14f; float ar=0;

public void get() { System.out.println("Enter the radius of circle:"); r=s.nextInt(); } public void put() { ar=pi*r*r; System.out.println("Area of circle:"+ar+"sq cm"); } } class rectangle implements shape {

int len,bdth; float ar=0f;

public void get() { System.out.println("Enter the length and breadth:"); len=s.nextInt(); bdth=s.nextInt(); } public void put() { ar=len*bdth; System.out.println("Area of rectangle:"+ar+"sq cm"); } } class rDemo { public static void main(String args[]) { rectangle r=new rectangle(); r.get(); r.put();

circle c=new circle(); c.get(); c.put(); } }

OUTPUT: