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Java Programming [ Lab Programs ]

Aim:

Source Code:

Sample_Program.java


/* Sample java program to check given number is prime or not */

//Importing packages

import java.lang.System;

import java.util.Scanner;

// Creating Class

class Sample_Program {

    // main method

    public static void main(String args[]) {  

        int i,count=0,n;

        // creating scanner object

        Scanner sc=new Scanner(System.in);

        // get input number from user

        System.out.print("Enter Any Number : ");

        n=sc.nextInt(); 

        // logic to check prime or not

        for(i=1;i<=n;i++) {    

            if(n%i==0) {       

                    count++;   

            }    

        }    

        if(count==2)    

            System.out.println(n+" is prime"); 

        else

            System.out.println(n+" is not prime"); 

 

    }  

}

Output:

Java Programming Lab Programs

1) Use eclipse or Netbean platform and acquaint with the various menus, create a test project, add a test class and run it see how you can use auto suggestions, auto fill. Try code formatter and code refactoring like renaming variables, methods and classes. Try debug step by step with a small program of about 10 to 15 lines which contains at least one if else condition and a for loop. View Solution

2) Write a Java program that works as a simple calculator. Use a grid layout to arrange buttons for the digits and for the +, -,*, % operations. Add a text field to display the result. Handle any possible exceptions like divided by zero. View Solution

3) a) Develop an applet in Java that displays a simple message. View Solution

3) b) Develop an applet in Java that receives an integer in one text field, and computes its factorial Value and returns it in another text field, when the button named “Compute” is clicked. View Solution

4) Write a Java program that creates a user interface to perform integer divisions. The user enters two numbers in the text fields, Num1 and Num2. The division of Num1 and Num 2 is displayed in the Result field when the Divide button is clicked. If Num1 or Num2 were not an integer, the program would throw a Number Format Exception. If Num2 were Zero, the program would throw an Arithmetic Exception. Display the exception in a message dialog box. View Solution

5) Write a Java program that implements a multi-thread application that has three threads. First thread generates random integer every 1 second and if the value is even, second thread computes the square of the number and prints. If the value is odd, the third thread will print the value of cube of the number. View Solution

6) Write a Java program for the following: i) Create a doubly linked list of elements. ii) Delete a given element from the above list. iii)Display the contents of the list after deletion. View Solution

7) Write a Java program that simulates a traffic light. The program lets the user selects one of three lights: red, yellow, or green with radio buttons. On selecting a button, an appropriate message with Stop, Ready, or Go should appear above the buttons in the selected color. Initially, there is no message shown View Solution

8) Write a Java program to create an abstract class named Shape that contains two integers and an empty method named print Area (). Provide three classes named Rectangle, Triangle, and Circle such that each one of the classes extends the class Shape. Each one of the classes contains only the method print Area () that prints the area of the given shape. View Solution

9) Suppose that a table named Table.txt is stored in a text file. The first line in the file is the header, and the remaining lines correspond to rows in the table. The elements are separated by commas. Write a java program to display the table using Labels in Grid Layout. View Solution

10) Write a java program that handles all mouse events and shows the event name at the center of the window when a mouse event is fired (Use Adapter classes). View Solution

11) Write a Java Program that loads names and phone numbers from a text file where the data is organized as one line per record and each filed in a record are separated by a tab (\t). It takes a name or phone number as input and prints the corresponding other value from the hash table (hint: use hash tables). View Solution

12) Write a Java program that correctly implements the producer – consumer problem using the concept of inter thread communication View Solution

13) Write a Java program to list all the files in a directory including the files present in all its subdirectories View Solution