/* Program that accepts a shopping list of five items from the command line and stores them in a vector */

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Jocelin Hamilton
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1 /* Program that accepts a shopping list of five items from the command line and stores them in a vector */ import java.util.*; // load Vector class class ShoppingList public static void main(string args[ ]) int count=0,i; //creating vector with initial capacity 5 and increment of 2 Vector v = new Vector(5,2); count =args.length; //finding length for(i=0;i<count;i++) v.addelement(args[i]); //adding elements into Vector v //****** Enumerate the elements in the Vector ********* Enumeration venum = v.elements(); System.out.println("\nItems in Shopping list are:"); // returns true when there are still more elements to extracts while(venum.hasmoreelements()) // obtain next object in the enumeration System.out.println("\t"+vEnum.nextElement() +" "); System.out.println(); E:\cp2>javac ShoppingList.java E:\cp2>java ShoppingList Milk Bread Butter Cheese Coffee Items in Shopping list are: Milk Bread Butter Cheese Coffee */

2 /* write a Program to implement multilevel inheritance by using interface */ class student int roll_number; void get_number(int a) // get_number is a method roll_number = a; //assign a to roll_number void put_number() // put_number is a method System.out.println("Roll No. : "+roll_number); class test extends student // class test inherit roll_number from student float sem1, sem2; void get_marks (float s1, float s2) // get_marks is a method sem1 = s1; sem2 = s2; void put_marks() // put_marks is a method System.out.println("Marks obtained : "); System.out.println("Sem1 = "+sem1); System.out.println("Sem2 = "+sem2); interface sports float score=4.0f; void put_score(); class Result extends test implements sports // multilevel inheritance float total;

3 void display() total = sem1 + sem2 + score; put_number( ); put_marks( ); put_score( ); System.out.println("Total Marks : "+total); public void put_score()// put_score is a method System.out.println("Sports weight : "+score); class Hybrid //main class public static void main(string args[]) Result R1=new Result(); //creating object of result class R1.get_number(786); //invoking methods R1.get_marks(1100,1100); R1.display( ); E:\CP2>javac Hybrid.java E:\CP2>java Hybrid Roll No. : 786 Marks obtained : Sem1 = Sem2 = Sports weight : 4.0 Total Marks : */

4 /* Write a program to find volume of Sphere and Hemisphere using abstract class */ abstract class Volume final float pi=3.14f; protected int r; protected float v; abstract float DisplayVolume(); // unimplemented method class Sphere extends Volume // inheriting volume class into sphere float DisplayVolume() // implementing display method v=(4*pi*r*r*r)/3; return(v); // returning the value in variable v class HemiSphere extends Volume //inheriting volume class into hemisphere float DisplayVolume() // implementing display method v=(2*pi*r*r*r)/3; return(v); // returning the value in variable v class VolumeSphere public static void main(string args[]) Sphere s=new Sphere(); // creating object of sphere class HemiSphere hs=new HemiSphere(); // creating object of sphere class s.r=5; //setting the value of r with reference to sphere object hs.r=5; //setting the value of r with reference to hemisphere object System.out.println("Volume of Sphere : "+s.displayvolume()); // invoking metohds System.out.println("Volume of Hemisphere : "+hs.displayvolume()); F:\cp2>javac VolumeSphere.java F:\cp2>java VolumeSphere Volume of Sphere : Volume of Hemisphere : */

5 /* Write a program to display the string in main thread and child thread */ class Mythread1 extends Thread //inheriting the properties of thread public static void main(string args[])// main method Mythread1 ex=new Mythread1();//creating object of main class ex.create(); // creating main thread System.out.println("this is the main thread!");//displaying string public void create()// creating another thread Thread t=new Thread(this); // creating object of Thread class with reference to the current object t.start(); //starting a thread public void run()// running a thread while(true) //while terminate try System.out.println("");//displaying string Thread.sleep(500); // sleep for 500 ms catch (InterruptedException e) F:\cp2>javac Mythread1.java F:\cp2>java Mythread1 this is the main thread! */

UNIT - V. Inheritance Interfaces and inner classes Exception handling Threads Streams and I/O

UNIT - V. Inheritance Interfaces and inner classes Exception handling Threads Streams and I/O UNIT - V Inheritance Interfaces and inner classes Exception handling Threads Streams and I/O 1 INHERITANCE 2 INHERITANCE What is Inheritance? Inheritance is the mechanism which allows a class B to inherit