JAVATRONS

WAP to Testing the Math class methods....

public class MainClass

{

   public static void main( String args[] )

   {

      System.out.printf( "Math.abs( 23.7 ) = %f\n", Math.abs( 23.7 ) );

      System.out.printf( "Math.abs( 0.0 ) = %f\n", Math.abs( 0.0 ) );

      System.out.printf( "Math.abs( -23.7 ) = %f\n", Math.abs( -23.7 ) );

      System.out.printf( "Math.ceil( 9.2 ) = %f\n", Math.ceil( 9.2 ) );

      System.out.printf( "Math.ceil( -9.8 ) = %f\n", Math.ceil( -9.8 ) );

      System.out.printf( "Math.cos( 0.0 ) = %f\n", Math.cos( 0.0 ) );

      System.out.printf( "Math.exp( 1.0 ) = %f\n", Math.exp( 1.0 ) );

      System.out.printf( "Math.exp( 2.0 ) = %f\n", Math.exp( 2.0 ) );

      System.out.printf( "Math.floor( 9.2 ) = %f\n", Math.floor( 9.2 ) );

      System.out.printf( "Math.floor( -9.8 ) = %f\n", Math.floor( -9.8 ) );

      System.out.printf( "Math.log( Math.E ) = %f\n", Math.log( Math.E ) );

      System.out.printf( "Math.log( Math.E * Math.E ) = %f\n", Math.log( Math.E * Math.E ) );

      System.out.printf( "Math.max( 2.3, 12.7 ) = %f\n",Math.max( 2.3, 12.7 ) );

      System.out.printf( "Math.max( -2.3, -12.7 ) = %f\n",Math.max( -2.3, -12.7 ) );

      System.out.printf( "Math.min( 2.3, 12.7 ) = %f\n",Math.min( 2.3, 12.7 ) );

      System.out.printf( "Math.min( -2.3, -12.7 ) = %f\n",Math.min( -2.3, -12.7 ) );

      System.out.printf( "Math.pow( 2.0, 7.0 ) = %f\n",Math.pow( 2.0, 7.0 ) );

      System.out.printf( "Math.pow( 9.0, 0.5 ) = %f\n", Math.pow( 9.0, 0.5 ) );

      System.out.printf( "Math.sin( 0.0 ) = %f\n", Math.sin( 0.0 ) );

      System.out.printf( "Math.sqrt( 900.0 ) = %f\n", Math.sqrt( 900.0 ) );

      System.out.printf( "Math.sqrt( 9.0 ) = %f\n", Math.sqrt( 9.0 ) );

      System.out.printf( "Math.tan( 0.0 ) = %f\n", Math.tan( 0.0 ) );

   }

}

OUTPUT:-

Math.abs( 23.7 ) = 23.700000
Math.abs( 0.0 ) = 0.000000
Math.abs( -23.7 ) = 23.700000
Math.ceil( 9.2 ) = 10.000000
Math.ceil( -9.8 ) = -9.000000
Math.cos( 0.0 ) = 1.000000
Math.exp( 1.0 ) = 2.718282
Math.exp( 2.0 ) = 7.389056
Math.floor( 9.2 ) = 9.000000
Math.floor( -9.8 ) = -10.000000
Math.log( Math.E ) = 1.000000
Math.log( Math.E * Math.E ) = 2.000000
Math.max( 2.3, 12.7 ) = 12.700000
Math.max( -2.3, -12.7 ) = -2.300000
Math.min( 2.3, 12.7 ) = 2.300000
Math.min( -2.3, -12.7 ) = -12.700000
Math.pow( 2.0, 7.0 ) = 128.000000
Math.pow( 9.0, 0.5 ) = 3.000000
Math.sin( 0.0 ) = 0.000000
Math.sqrt( 900.0 ) = 30.000000
Math.sqrt( 9.0 ) = 3.000000
Math.tan( 0.0 ) = 0.000000

WAP to Getting FileStore information.

import java.nio.file.FileStore;
 import java.nio.file.FileSystem;
 import java.nio.file.FileSystems;
 
 public class Test

 {
   static final long kiloByte = 1024;
 
   public static void main(String[] args) throws Exception

  {
     FileSystem fileSystem = FileSystems.getDefault();
 
     for (FileStore fileStore : fileSystem.getFileStores())

     {
       long totalSpace = fileStore.getTotalSpace() / kiloByte;
       long usedSpace = (fileStore.getTotalSpace() - fileStore
           .getUnallocatedSpace()) / kiloByte;
       long usableSpace = fileStore.getUsableSpace() / kiloByte;
       String name = fileStore.name();
       String type = fileStore.type();
       boolean readOnly = fileStore.isReadOnly();
     }
   }
 }

Write a program to HTTP Grab with FileChannel.

import java.io.FileOutputStream;
 import java.io.IOException;
 import java.net.InetSocketAddress;
 import java.net.SocketAddress;
 import java.net.URL;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
 import java.nio.channels.SocketChannel;
 
 public class MainClass {
 
   public static void main(String[] args) throws IOException {
 
     URL u = new URL("http://www.java2s.com");
     String host = u.getHost();
     int port = 80;
     String file = "/";
 
     SocketAddress remote = new InetSocketAddress(host, port);
     SocketChannel channel = SocketChannel.open(remote);
     FileOutputStream out = new FileOutputStream("yourfile.htm");
     FileChannel localFile = out.getChannel();
 
     String request = "GET " + file + " HTTP/1.1\r\n" + "User-Agent: HTTPGrab\r\n"
         + "Accept: text/*\r\n" + "Connection: close\r\n" + "Host: " + host + "\r\n" + "\r\n";
 
     ByteBuffer header = ByteBuffer.wrap(request.getBytes("US-ASCII"));
     channel.write(header);
 
     ByteBuffer buffer = ByteBuffer.allocate(8192);
     while (channel.read(buffer) != -1) {
       buffer.flip();
       localFile.write(buffer);
       buffer.clear();
     }
 
     localFile.close();
     channel.close();
   }
 }

Write a program to Save Web page to a file.

import java.io.FileOutputStream;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.net.URL;
 
 import javax.swing.text.html.parser.DTD;
 
 public class MainClass

    {
     public static void main(String[] args)

{

try

      {
       URL u = new URL("http://www.java2s.com");
       OutputStream out = new FileOutputStream("test.htm");
       InputStream in = u.openStream();
       DTD html = DTD.getDTD("html");
       System.out.println(html.getName());
       in.close();
       out.flush();
       out.close();
       }

      catch (Exception e) {
       System.err.println("Usage: java PageSaver url local_file");
     }
 
   }
 
 }

Write a program to check your own ip address...

import java.net.*;

class CheckIp
{
       public static void main(String args[])
      {
       try
       {
         InetAddress address=InetAddress.getLocalHost();
         System.out.println(address);
        }
     catch(UnknownHostException e)
   {
System.out.println("could not find yahoo .com");
}
}
}

Write a program to comarision of two string.

class stringmethod
{
    public static void main(String[] args)
      {
        String string1 = "Hi";
        String string2 = new String("Hello");
        if (string1 == string2)
           {
            System.out.println("The strings are equal.");
            }
else
               {
                System.out.println("The strings are unequal.");
                }
        }
}

Output of the program:-

The strings are unequal

Write a program to print a Stact Trace Message.

public class PrintStack
{
           public static void main (String args[])
              {
               String str = "Exception" ;
               int len=0;
           try
              {
             StringBuffer sbuf = new StringBuffer(str);
            len = str.length() ;
           for(int ct=len;ct>=0;ct--)
            {
          System.out.print(sbuf.charAt(ct));
           }
       }
       catch(Exception e)
      {
      e.printStackTrace();
       }
     }
   }

OUTPUT OF THE PROGRAM:-

java.lang.StringIndexOutOfBoundsException: String index out of range: 9
at java.lang.StringBuffer.charAt(Unknown Source)
at PrintStack.main(PrintStack.java:13)

Write a program to take input from user and give the output.

/* Reading from the console. */

import java.util.Scanner;

import static java.lang.System.out;

public class ConsoleInput {

public static void main(String[] args) {

// Create a Scanner which is chained to System.in, i.e. to the console.

Scanner lexer = new Scanner(System.in);

// Read a list of integers.

int[] intArray = new int[3];

out.println("Input a list of integers (max. " + intArray.length + "):");

for (int i = 0; i < intArray.length;i++)

intArray[i] = lexer.nextInt();

for (int i : intArray)

out.println(i);

// Read names

String firstName;

String lastName;

String name;

String repeat;

do {

lexer.nextLine(); // Empty any input still in the current line

System.out.print("Enter first name: ");

firstName = lexer.next();

lexer.nextLine();

System.out.print("Enter last name: ");

lastName = lexer.next();

lexer.nextLine();

name = lastName + " " + firstName;

System.out.println("The name is " + name);

System.out.print("Continue? (y/n): ");

repeat = lexer.next();

} while (repeat.equals("y"));

lexer.close();

}

Write a program to calculate the date and the date formet and time formate.

Formatted Time and Date

import java.util.Calendar;

import java.util.GregorianCalendar;

import java.util.Locale;

import static java.lang.System.out;

import static java.util.Calendar.*;

import static java.util.Locale.*;

class FormattedTimeDate {

public static void main(String[] args) {

Calendar myCalender = Calendar.getInstance();

{

// Formatting the hour

out.printf("Hour(00-24):%tH\n", myCalender);

out.printf("Hour(01-12):%tI\n", myCalender);

out.printf("Hour(0-23):%tk\n", myCalender);

out.printf("Hour(1-12):%tl\n", myCalender);

}

{

// Formatting the minutes

out.printf("Minutes(00-59):%tM\n", myCalender);

}

{

// Formatting the seconds

out.printf("Seconds(00-60):%tS\n", myCalender);

// out.printf("Millieseconds(000-999):%tL\n", myCalender);

out.printf("Nanoseconds(000000000-999999999):%tN\n", myCalender);

}

{

// PM/pm and AM/am

out.printf("%tp\n", myCalender);

out.printf("%Tp\n", myCalender);

}

{

// Formatting the year

out.printf("%tC%n", myCalender);

out.printf("%tY%n", myCalender);

out.printf("%ty%n", myCalender);

}

{

// Formatting the month

out.printf("%tB%n", myCalender);

out.printf("%tb%n", myCalender);

out.printf("%th%n", myCalender);

out.printf("%tm%n", myCalender);

out.printf(US,"%tB%n", myCalender);

}

{

// Formatting the day

out.printf("%tA%n", myCalender);

out.printf("%ta%n", myCalender);

out.printf("%tj%n", myCalender);

out.printf("%td%n", myCalender);

out.printf("%te%n", myCalender);

out.printf(US,"%tA%n", myCalender);

}

{

// Composite Date/Time Format Conversions

out.printf("%tR%n", myCalender);

out.printf("%tT%n", myCalender);

out.printf("%tr%n", myCalender);

out.printf("%tD%n", myCalender);

out.printf("%tF%n", myCalender);

out.printf("%tc%n", myCalender);

}

{

// Misc. usage

// Note that the specifiers refer to the same argument in the format string.

out.printf("%1$tm %1$te %1$tY%n", myCalender);

out.printf(US, "The world will end on %1$tA, %1$te. %1$tB %1$tY" +

" at %1$tH:%1$tM:%1$tS.%n", myCalender);

out.printf("The world will end on %1$tA, %1$te. %1$tB %1$tY at %1$tH:%1$tM:%1$tS.%n",

myCalender);

//out.printf("%1$^-15tA, %1$6te. %1$^10tB %1$tY, %1$tH:%1$tM:%1$tS.%n", <==== !!!!!!!!!

// myCalender);

Calendar birthdate = new GregorianCalendar(1949, MARCH, 1);

out.printf("Author's Birthday: %1$tD%n", birthdate);

}

Write a program of logic gates.

import logicgate.And;

import logicgate.Or;

import logicgate.Not;

import java.util.Scanner;

class Gate

{

public static void main(String[] args)

{

int a,b;

System.out.println("Enter Values");

Scanner sc=new Scanner(System.in);

And and=new And();

Or or=new Or();

Not not=new Not();

a=sc.nextInt();

b=sc.nextInt();

and.doOperation(a,b);

or.doOperation(a,b);

not.doOperation(a);

}

Write a program to perform 3X3 matrix addition.

class MatrixAdd

{

public static void main(String arg[])

{

int a[][]= new int[3][3];

int b[][] = new int[3][3];

int c[][]= new int[3][3];

int i,j,k=0;

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

a[i][j]=k;

k++;

b[i][j]=k;

}

System.out.println("1st mat. is");

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

System.out.print(" " +a[i][j]);

}

System.out.println("\n");

}

System.out.println("2nd mat. is");

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

System.out.print(" " +b[i][j]);

}

System.out.println("\n");

}

System.out.println("addtn is");

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

c[i][j]=a[i][j]+b[i][j];

}

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

System.out.print(" " +c[i][j]);

}

System.out.println("\n");

}

Write a program to print the diagonal elements of 3X3 matrix .

class Dmatrix

{

public static void main(String arg[])

{

int a[][]= new int[3][3];

int i,j,k=0;

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

a[i][j]=k;

k++;

}

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

System.out.print(" " +a[i][j]);

}

System.out.println("\n");

}

System.out.println("digo. elment are ");

for(i=0;i<3;i++)

{

for(j=0;j<3;j++)

{

if(i!=j)

System.out.print(" ");

else

System.out.println(" "+a[i][j]);

}

Write a program to take input from user in a integer and print a table of that value , like Enter Value : 3 3 X 1 = 3 3 X 2 = 6 . 3 X 10 = 30

class Table

{

public static void main(String args[])

{

int a=Integer.parseInt(System.console().readLine("enter the value of a"));

int i,count;

for(i=1;i<=10;i++)

{

count=a*i;

System.out.println(" "+count);

}

Write a program that ask user to enter values in two integer a and b, now write a code to swap the values of a and b without taking any temporary variable.

import java.util.Scanner;

public class Swap

{

public static void main(String[]hjk)

{

int a,b;

Scanner s1=new Scanner(System.in);

System.out.println("enter first num as a");

a=s1.nextInt();

Scanner s2=new Scanner(System.in);

System.out.println("enter second num as b");

b=s2.nextInt();

a=a+b;

b=a-b;

a=a-b;

System.out.println("the swapped num are");

System.out.println("a="+a);

System.out.println("b="+b);

}

WAP to print the pelendrome 5 digits.

class Palendrome

{

public static void main(String args[])

{

int n=Integer.parseInt(System.console().readLine("enter the 5 no. digitno. n"));

int a=n;

int b=a%10;

b=b+10000;

a=a/10;

int c=a%10;

c=c+1000;

a=a/10;

int d=a%10;

d=d+100;

a=a/10;

int e=a%10;

e=e+10;

a=a/10;

int sum=a+b+c+d+e;

if(sum==n)

{

System.out.println("Entered no. is pelendrome");

}

else

{

System.out.println("Entered no. is pelendrome");

}

W.A.P. to convert Celsius to Fahrenheit

class ConvertCtoF

{

public static void main(String[] args)

{

int c;

System.out.println("Fahrenheit is:->");

for(c=0;c<=100;c++)

{

float f=c*(9/5f)+32;

System.out.println("Celsius="+c+"Fahrenheit="+f);

}

Write a program to display grade message according to the marks obtained by the student

import java.util.*;

class StudentGrade

{

public static void main(String a[])

{

int studentmarks;

Scanner in=new Scanner(System.in);

System.out.println("enter the marks of student");

studentmarks=in.nextInt();

if((studentmarks>=300)&&(studentmarks<=500))

{

System.out.println("Grade A");

}

if((studentmarks>=225)&&(studentmarks<=299))

{

System.out.println("Grade B");

}

if((studentmarks>=165)&&(studentmarks<=224))

{

System.out.println("Grade C");

}

if(studentmarks<165)

{

System.out.println("Fail");

}

Write a program to check that the entered no is prime or not.

import java.util.*;

class PrimeNo

{

public static void main(String[] args)

{

int num;

int i;

Scanner in=new Scanner(System.in);

System.out.println("enter the value of num");

num=in.nextInt();

for (i=2; i < num ;i++ )

{

int n = num%i;

if (n==0)

{

System.out.println("not Prime!");

break;

}

if(i == num)

{

System.out.println("Prime number!");

}

Write a program to print the Fibonacci series.

class Fib {

public static void main(String args[ ])

{

int n=Integer.parseInt(System.console().readLine("Enter the value of n="));

int i,a=0,b=1,c=0;

System.out.println("fibnoci series is:");

System.out.print(a);

System.out.print(" "+b);

for(i=0;i<n-2;i++)

{

c=a+b;

a=b;

b=c;

System.out.print(" "+c);

}

System.out.println();

System.out.print("th value of the series is: "+c);

}

Write a program to find out the factorial of the given no.

class Factorial

{

public static void main(String args[])

{

int i,num;

num=Integer.parseInt(System.console().readLine("Enter the number="));

int fact=1;

for(i=1;i<=num;i++)

{

fact=fact*i;

}

System.out.println("factorial of Number="+fact);

}

Output of the program:-

OUTPUT OF THE PROGRAM:-

java.lang.StringIndexOutOfBoundsException: String index out of range: 9 at java.lang.StringBuffer.charAt(Unknown Source) at PrintStack.main(PrintStack.java:13)

java.lang.StringIndexOutOfBoundsException: String index out of range: 9
at java.lang.StringBuffer.charAt(Unknown Source)
at PrintStack.main(PrintStack.java:13)