BCA and B.Sc Programs - Programming in Java Lab - Bharathiar University - Practical Program 5- Write a Java Program to draw several shapes in the created windows.

 

Bharathiar University

Programming Java Lab

Java Program 5

 Write a Java Program to draw several shapes in the created windows.

Syntax for Methods used in this program

To draw Oval:

drawOval(int x, int y, int width, int height) 

To change Pen Color:
setColor(Color c)

To color the Oval:
fillOval(int x, int y, int width, int height)

To draw rectangle:
drawRect(int x, int y, int width, int height) 

To draw line:
drawLine(int x1, int y1, int x2, int y2)

To draw arc:
drawArc(int x, int y, int width, int height, int startAngle, int arcAngle)

Source Code

 

import java.awt.*;  

import java.applet.*;  

public class Shapes extends Applet

{

 public void paint(Graphics g)

 {

  g.setFont(new Font("Calibri", Font.BOLD,30));

  g.drawString("Different Shapes in Applet", 20, 20);

  g.drawOval(50,50,80,100);   

  g.setColor(Color.RED);  

  g.fillOval(50,50,80,100);

  g.drawRect(150,150,120,100);

  g.drawLine(270,270,350,350);

  g.drawArc(60,280,100,80,180,180);  

 }

}

/* <applet code="Shapes.class" width="400" height="400"> 

</applet>

*/

Output:

Applet Window

BCA and B.Sc Programs - Programming in Java Lab - Bharathiar University - Practical Program 2- Write a Java Program to implement the concept of multiple inheritance using Interfaces.

 

Bharathiar University

Programming Java Lab

Java Program 2

Write a Java Program to implement the concept of multiple inheritance using Interfaces

Source Code 

import java.util.Scanner;

//Student Detail

interface Detail

{

final String academic_year="2023-2024";

    public void getDetail();

}

//Student Marks 

interface Marks

{

public void getMarks();

    public void print();

}

//multiple inheritance using inteface

class Student implements Detail,Marks

{   

String rollno,name,degree,sem;

    int m1,m2,m3,total;

    float percent;

public void getDetail()

{

        Scanner in = new Scanner(System.in);

        System.out.print("Enter Student Roll Number : ");

        rollno = in.nextLine();

        System.out.print("Enter Student Name : ");

        name = in.nextLine();

        System.out.print("Enter degree : ");

        degree = in.nextLine();

        System.out.print("Enter year : ");

        sem = in.nextLine();

}

    

    public void getMarks()

    {

        Scanner in = new Scanner(System.in);

   

        System.out.print("Enter Mark1 : ");

        m1 = in.nextInt();

System.out.print("Enter Mark2 : ");

        m2 = in.nextInt();

        System.out.print("Enter Mark3 : ");

        m3 = in.nextInt();

        total=m1+m2+m3;

        percent=(total*100)/300;

    }

   

    public void print()

    {

        System.out.println("\nAcademic Year:  "+academic_year);

    System.out.println("Student Roll Number:  "+rollno);

        System.out.println("Student Name:  "+name);

        System.out.println("Degree:  "+degree);

        System.out.println("Semester:  "+sem);

        System.out.println("Total Marks:  "+total);

        System.out.println("Percentage:  "+percent);

    }

    public static void main (String args[])

    {

    Student s = new Student();

    s.getDetail();

        s.getMarks();

    s.print();

    }

}

Output

BCA and B.Sc Programs - Programming in Java Lab - Bharathiar University - Practical Program 1- Write a Java Applications to extract a portion of a character string and print the extracted string.

 

Bharathiar University

Programming Java Lab

Java Program 1

Write a Java Applications to extract a portion of a character string and print the extracted string.

Source Code 

import java.util.Scanner;

public class PrintString

{ 

    public static void main(String args[]) 

    {

        Scanner in = new Scanner(System.in);

        System.out.print("Enter a string : ");

        String s = in.nextLine();

        int len = s.length();

        System.out.print("Enter index of starting character  : ");

        int n = in.nextInt();

       

        if(n < 0 || n >= len)

        {

            System.out.println("Invalid index");

            System.exit(1);

        }

       

        System.out.print("Enter number of characters to extract from String :\n ");

        int m = in.nextInt();

       

        int substrend = n + m;

        if( m <= 0 || substrend > len)

        {

            System.out.println("Invalid number of characters");

            System.exit(1);

        }      

        String extstr = s.substring(n, substrend);

        System.out.println("Extracted String = " + extstr);

    }

}

Output: