A 6 java.txt

1.     WAP for abstract class  and  methods taking  example  of college  as  super class  and 
 CSE, Extc, Mech  departments as  subclasses.


abstract class Clg{
    String clgName;
    public Clg(String name){
        this.clgName=name;
    }
    abstract void department();
}
 class CSE extends Clg{
    CSE(String clgName){
        super(clgName);
    }
    void department(){
        System.out.println("College Name : "+this.clgName);
        System.out.println("Computer Science and Engnieering");
    }
}

 class ENTC extends Clg{
    ENTC(String clgName){
        super(clgName);
    }
    void department(){
        System.out.println("College Name : "+this.clgName);
        System.out.println("Computer Science and Engnieering");
    }
}

 class MECH extends Clg{
    MECH(String clgName){
        super(clgName);
    }
    void department(){
        System.out.println("College Name : "+this.clgName);
        System.out.println("Computer Science and Engnieering");
    }
}
public class Sample {
    public static void main(String[] args) {
        CSE cse=new CSE(" WIT ");
        cse.department();
        
        ENTC entc=new ENTC(" IIT ");
        entc.department();
        
        MECH mech=new MECH(" VIT ");
        mech.department();
  
       
    }
}






2  Write a program implementing simple interface calculate having two methods addition and subtraction 
implementing class has to defends on method multiplication and division also your program should access interface variables


interface Calculator{
    
     int sum(int a,int b);
     int sub(int a,int b);
     
     
}
class Calculate  implements Calculator{
   
    public int sum(int a,int b){
        return a+b;
    }
   
    public int sub(int a,int b){
        return a-b;
    }

    public int mul(int a,int b){
        return a*b;
    }

    public double div(double a,double b){
        return a/b;
    }
    
}
public class Sample {
   public static void main(String[] args) {
    Calculate cal=new Calculate();
    
    System.out.println(cal.sum(2,3));
    System.out.println(cal.sub(9,3));
    System.out.println(cal.mul(2,4));
    System.out.println(cal.div(7,3));
   } 
}


3 Write a program demonstrating shape example for area in the perimeter method using interface shape

import java.util.*;
interface Shape{
     void area();
    void perimeter();
}
//Square 
class Square implements Shape{
    private int side;
    public Square(int side){
        this.side=side;
    }
    
    public void area(){
        System.out.println("area : "+side*side);
    }
    public void perimeter(){
        System.out.println("Perimeter : "+4*side);
    }
}

//Rectangle
class Rectangle implements Shape{
    private int length,breadth;
    public Rectangle(int length,int breadth){
        this.length=length;
        this.breadth=breadth;
    }
    
    public void area(){
        System.out.println("area : "+length*breadth);
    }
    public void perimeter(){
        System.out.println("Perimeter : "+2*(length+breadth));
    }
}

//TRIANGLE

class Triangle implements Shape{
    private double s1,s2,s3;
   public Triangle(double s1,double s2,double s3){
    this.s1=s1;
    this.s2=s2;
    this.s3=s3;
   }
   
    
    public void area(){

        
        System.out.println("area : "+0.5*s1*s2);
    }
    public void perimeter(){
        double per=s1+s2+s3;
        System.out.println("Perimeter : "+per);
    }
}
//CIRCLE
class SemiCircle implements Shape{
    private float radius;
    public SemiCircle(float radius){
        this.radius=radius;
        
    }
    
    public void area(){
        System.out.println("area : "+(3.14*radius*radius)/2);
    }
    public void perimeter(){
        System.out.println("Perimeter : "+3.14*radius);
    }
}
public class Sample2 {
    public static void main(String[] args) {
        Square s=new Square(5);
        System.out.println("FOR SQUARE");
        s.area();
        s.perimeter();
        Rectangle r=new Rectangle(5,10);
        System.out.println("FOR RECTANGLE");
        r.area();
        r.perimeter();
       Triangle  t=new Triangle(5,10,4);
        System.out.println("FOR TRIANGLE");
        t.area();
        t.perimeter();

        SemiCircle sc=new SemiCircle(5);
        System.out.println("FOR SEMICIRCLE");
        sc.area();
        sc.perimeter();
    }
}