JAVA B.SC 5th Sem Journal || programming source codes for beginner's ||

1) Write A Java Program For Bubble Sort Using Class Concept.

 import java.io.*;

class bubble {

 void sort(int arr[])

 {

 int n = arr.length;

 for(int i=0; i<n-1; i++)

 for(int j=0; j<n-i-1; j++)

 if(arr[j] > arr[j+1])

 {

 int temp = arr[j];

 arr[j] = arr[j+1];

 arr[j+1] = temp;

 }

 }

 void printArray(int arr[])

 {

 int n = arr.length;

for(int i=0; i<n; i++)

 System.out.println(arr[i]);

 }

public static void main (String args[])

{

 bubble ob = new bubble();

 int arr[] = {64,34,25,12,22,11,90};

 ob.sort(arr);

 System.out.println("sorted array");

 ob.printArray(arr);

}

}

2) Write A Java Program to Illustrate A Binary Search.

import java.io.*;

public class binarysearch

{

 int search(int arr[], int l, int r, int x)

 {

 if(r>=l)

 {

 int mid = l + (r-1)/2;

 if (arr[mid]==x)

 return mid;

 if(arr[mid] > x)

 return search(arr,l,mid-1,x);

 else

 return search(arr,mid+1,r,x);

 }

return-1;

 }

 public static void main(String args[])

 {

 binarysearch ob = new binarysearch();

 int arr[] = {2,3,4,10,40};

 int n = arr.length;

 int x = 10;

 int result = ob.search(arr,0,n-1,x);

 if(result == -1)

 System.out.println("element not present");

 else

 System.out.println("element found at index"+result);

 }

}

3) Write A Java Program To Illustrate Constructor Overloading.

import java.io*;

class studentcon

{

 int id;

 String name;

 int age;

 studentcon(int i, String n)

 {

 id = i;

 name = n;

 }

 studentcon(int i, String n, int a)

 {

 id = i;

 name = n;

 age = a;

 }

 void display()

{

 System.out.println("------------student info----------");

 System.out.println("name of student is="+name);

 System.out.println("rno of student="+id);

 System.out.println("age of student is="+age);

 }

 public static void main(String args[])

 {

 studentcon s1 = new studentcon(301,"karan");

 studentcon s2 = new studentcon(801,"smita",19);

 s1.display();

 s2.display();

 }

}

4) Write A Java Program Which Display's No. Of Objects Created By Static Variable.

import java.io.*;

class Countobject

{

 static int count;

 Countobject()

 {

 count ++;

 }

 public static void main(String args[])

 {

 Countobject ob1 = new Countobject();

 Countobject ob2 = new Countobject();

 Countobject ob3 = new Countobject();

 Countobject ob4 = new Countobject();

 Countobject ob5 = new Countobject();

 System.out.println("total number of

objects:"+Countobject.count);

 }

}

5) Write A Java Program To Count The Frequency Of Words And Characters In Given String.

import java.io*;

class frequency

{

 public static void main(String args[])

 {

 String str = "i am student of gss belgavi cs dept";

 int word = 0;

 int freq[] = new int[str.length()];

 int i,j;

 char String[] = str.toCharArray();

 for(i=0;i<str.length();i++)

 {

 if(String[i]==' ')

word = word + 1;

 }

 System.out.println("no of words are:"+(word+1));

 for(i=0;i<str.length();i++)

 {

 freq[i] = 1;

 for(j= i+1;j<str.length();j++)

 {

 if(String[i] == String[j])

 {

 freq[i]++;

 String[j] = '0';

 }

 }

 }

 System.out.println("characters and their corresponding

frequencies");

 for(i=0;i<freq.length;i++)

 {

if(String[i] !=' '&&String[i] !='0')

 System.out.println(String[i] + "-" + freq[i]);

 }

 }

}

6)Program using interface to determine whether the student is eligible for exam or not.

interface department

{

 int att=30;

 void getatt();

}

class student

{

 String name;

 String division;

 int rollno;

 void getvalue(String n, String c,int r)

 {

 name=n;

 rollno=r;

 division=c;

 }

 void display()

 {

 System.out.println("name of the student:"+name);

 System.out.println("roll no of the student:"+rollno)

System.out.println("division of the student:"+division);

 }

}

class exam extends student implements department

{

 public void getatt()

 {

 System.out.println("attendance of student:"+att);

 if(att>50)

 System.out.println("elligible");

 else

 System.out.println("not elligible");

 }

}

class interfacex

{

 public static void main(String args[])

 {

 exam e= new exam();

 e.getvalue("pawan","bsc",808);

e.display();

 e.getatt();

 }

}

7) Write A Java Program To Implement Exception Handling Using Multiple Catch Statements.

class Multicatch2

{

 public static void main(String[] args)

 {

 try

 {

 int a,b,c;

 a=200;

b=0;

 c=a/b;

 }

 catch(ArithmeticException e)

 {

 System.out.println(e);

 }

 catch(NullPointerException e)

 {

 System.out.println(e);

 }

 catch(NumberFormatException e)

 {

 System.out.println(e);

 }

 catch(ArrayIndexOutOfBoundsException e)

 {

 System.out.println(e);

 }

 System.out.println("welcome to java");

System.out.println("welcome to gss college...");

 }

}

8) Write A Java Program To Demonstrate User Defined Package.

Javac  -d  .  a.java

Javac  -d  .  a.java

Javac  demo.java

Java demo

9) Illustrate Creation Of Thread By Extending Thread Class.

class multithread1 extends Thread

{

 int i;

 public void run()

 {

 for(i=0;i<=5;i++)

 {

 System.out.println("this is belgavi");

 }

}

}

class multithread2 extends Thread

{

 int i;

 public void run()

 {

 for(i=0;i<=5;i++)

 {

 System.out.println("this is karnataka");

 }

 }

}

class Thrd

{

 public static void main(String args[])

 {

 multithread1 obj1= new multithread1();

 multithread2 obj2= new multithread2();

 obj1.start();

obj2.start();

 }

}

10) Illustrate Thread Creation By Implementing Runnable Interface.

class multithread1 implements Runnable

{

 int i;

 public void run()

 {

 for(i=0;i<=5;i++)

 {

 System.out.println("this is belgavi");

 }

 }

}

class multithread2 implements Runnable

{

 int i;

 public void run()

 {

 for(i=0;i<=5;i++)

 {

 System.out.println("this is karnataka");

 }

 }

}

class Thrd

{

 public static void main(String args[])

 {

 Thread t1 = new Thread(new multithread1());

 Thread t2 = new Thread(new multithread2());

 t1.start();

 t2.start();

 }

}