Addition Of Numbers

/*Example of class for addition of the two numbers*/

import java.awt.*;
import java.awt.event.*;
class as extends Frame implements ActionListener
  {
        TextField t1,t2,t3;    
         Button b1,b2,b3;

            public as()
              {
                     t1=new TextField(10);
         t2=new TextField(10);
                     t3=new TextField(10);
                      b1=new Button("ADD");
          b2=new Button("SUB");
          b3=new Button("EXIT");

              setLayout(new FlowLayout());
             
              add(b1); add(t1); add(b2);       add(t2);  add(t3);   add(b3);
             
                b1.addActionListener(this);
    b2.addActionListener(this);
                b3.addActionListener(this);
 
          }

            public static void main(String args[])throws Exception
   {
   
      as a=new as();

                  a.setSize(200,300);
                   a.setVisible(true);
             }

        public void actionPerformed(ActionEvent ae)
  {
 
                 int val1=Integer.parseInt(t1.getText());
     int val2=Integer.parseInt(t2.getText());
     int res;

if(ae.getSource()==b1)
   {
                    res=val1+val2;
                     t3.setText(" "+res);
               }

           
if(ae.getSource()==b2)
   {
                    res=val1-val2;
                     t3.setText(" "+res);
               }

           
if(ae.getSource()==b3)
   {
                    System.exit(0);
               }
      }
  }
    

Simple Applet Program

Following is a Simple applet program inn java.



import java.awt.*;
import java.applet.*;

public class app2 extends Applet
  {
     public void paint(Graphics g)
       {
             g.drawString("MY FIRST APPLET",30,30);
       }
  }

Applet in Java

HTML FILE CODE:

Create a file name sample.html and write the following code in it.

<applet code="app1"width=600 height=600></applet>

Then create a java file and write the following code in it.

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class app1 extends Applet implements ActionListener

 {

   

    Button b;

    TextField t;

      public void Init()

{

   b=new Button("CLICK:");

                t=new TextField(20);

          setLayout(new FlowLayout());

             add(b);    add(t);

              b.addActionListener(this);

         }

         public void actionPerformed(ActionEvent ae)

               {

                   if(ae.getSource()==b)

                      {

                          t.setText("YOUR NAME HERE:");

                      }

               }

         

     }

 

              

Simple Event Program In Java

/*EVENT PROGRAM IN JAVA*/

import java.lang.*;
import java.awt.*;
import java.awt.event.*;

class aaa extends Frame implements ActionListener
 {

     Button b1,b2,b3,b4,b5,b6;
     Label a,b,c,d,r,t;
     TextField a1,a2,a3,a4,a5,a6,a7;
       int a1;

           public aaa()
{
   b1=new Button("SUBMIT:");
   b2=new Button("RESET:");
   b3=new Button("EXIT:");
   b4=new Button("TOTAL:");
   b5=new Button("NEW:");
   b6=new Button("OLD:");

   a=new Label("NAME:");
   b=new Label("AGE:");
   c=new Label("GENDER:");
   d=new Label("EMAIL_ID:");
   r=new Label("MOBILE NUMBER:");
   t=new Label("NATIONALITY:");

   a1=new TextField(20);
   a2=new TextField(20);
   a3=new TextField(20);
   a4=new TextField(20);
   a5=new TextField(20);
   a6=new TextField(20);
   a7=new TextField(20);

    setLayout(new FlowLayout());
                  add(b5);  add(b6);
   
                   

                b1.addActionListener(this);
                b2.addActionListener(this);
   b3.addActionListener(this);
   b4.addActionListener(this);
   b5.addActionListener(this);
   b6.addActionListener(this);

          }

public aaa(int a1)
{
                 if(a1==0)
          {
            setLayout(new FlowLayout());
                           add(a);  add(b);  add(c);  add(d);  add(r);  add(t);
               add(b1);  add(b2);  add(b3);
          }
 }

          public void actionPerformed(ActionEvent ae)
{
  if(ae.getSource()==b5)
     {
        aaa(0);
     }

   if(ae.getSource()==b6)
      {
       
      setLayout(new FlowLayout());
            add(a);  add(b);  add(c);  add(d);  add(r);  add(t);
               add(b1);  add(b2);  add(b3);  add(b4);
       }
             
                  if(ae.getSource()==b3)
       {
                         System.exit(0);
       }
             

            }

public static void main(String args[])throws Exception
 {

aaa g=new aaa();

                       g.setSize(300,600);

          g.setVisible(true);

             }

      }

       
 

Search Pattern in Java

Program to find a specific pattern from a given text or file is stated as below.



import java.io.*;

class srchPattern
{
  public static void main(String args[])
  {
    if(args.length == 0 || args.length == 1)
    {
      System.out.println("Insufficient arguments...");
      return;
    }

    File f = new File(args[1]);

    try
    {
      BufferedReader i = new BufferedReader(new FileReader(args[1]));

      String line;
      int ct = 0;

      if(f.exists() && f.isFile())
      {
        while((line = i.readLine()) != null)
        {
          if((line.indexOf(args[0])) != -1)
          {
            ct++;
          }
          System.out.println(line + " ");
        }

        if(ct == 0)
        {
          System.out.println("Pattern not Found");
        }
        else
        {
          System.out.println("Pattern found in the file...");
          System.out.println("Number of Occurances of the word " + args[0] + " in te file " + args[1] + " is " + ct);
        }
      }
    }
    catch(Exception e){}
  }
}

Word,character count in Java

Program  to count the number of occurrences of a word in a file is given as below:


import java.io.*;

class wordcnt
{
  public static void main(String args[])
  {
    int i = 0,cnt = 0;
    try
    {
      FileInputStream fin = new FileInputStream("d:/java/wordcnt.java");
      String word;
      char ch , charr[];
      charr = new char[100];
      String w = new String("word");
      while(( ch = (char)fin.read()) != -1)
      {
        if( ch != ' ' && ch != '\n')
        {
           charr[i] = ch ;
           i++;
        }
        else
        {
           word = new String(charr,0,i);
           if(word.equals(w))
              cnt++;   
           if( ch == '\n')
              System.out.println( word );
           else
              System.out.print( word + " ");
           i = 0;
        }
     };
     fin.close();
    }
    catch(Exception ie)
    {
    }
    System.out.println("\n\nWord Count : " + cnt);
  }
}

Copy file in Java

Program to copy a file content in java is as follows:

 import java.io.*;

class FileCopy
{
  public static void main(String args[]) throws IOException
  {
    FileInputStream fin = new FileInputStream("d:/java/stk.java");
    FileOutputStream fout = new FileOutputStream("d:/java/txtfile.txt");
    int b;

    while(true)
    {
      b = fin.read();
      if(b == -1)
      {
        break;
      }
      System.out.print((char)b);
      fout.write(b);
    }

    fin.close();
    fout.close();
  }
}

Polynomial operations in Java

Program for Ploynomial expression in java is as follows:


import java.lang.*;
import java.io.*;
class term
{
  int coeff,exp;
}
class poly
{
    term pl[] = new term[10];
    int n;
    poly()throws Exception
    {
        poly p[]=new poly[10];
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter the no. of terms: ");
        n=Integer.parseInt(br.readLine());
    }
    public void getPoly()throws Exception
    {
        poly p[]=new poly[10];
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter the base & exponent:");
        for(int i=0;i<n;i++)
        {
            p[i].coeff=Integer.parseInt(br.readLine());
            p[i].exp=Integer.parseInt(br.readLine());
        }
    }   
    public void putPoly()
    {
        poly p[]=new poly[10];
        System.out.println("Polynomial is : ");
        for(int i=0;i<n;i++)
        {
            System.out.println(" "+p[i].coeff+"x^"+p[i].exp);
        }
    }
    public void evalPoly()throws exception
    {
        poly p[]=new poly[10];
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        int x,ans=0;
        System.out.println("Enter the value for x:");
         x=Integer.parseInt(br.readLine());   
        for(int i=0;i<n;i++)
        {
            ans=ans+p[i].coeff*pow(x,p[i].exp);
        }
        System.out.println("Ans : "+ans);
    }
    public static void main(String args[])throws Exception
    {
        poly p1=new poly();
        poly p2=new poly();
        p1.getPoly();
        p2.getPoly();
        p1.putPoly();
        p2.putPoly();
        p1.evalPoly();
       
    }   
}

Matrix in Java

Program for matrix in java is as follows:


import java.io.*;

class matrix
{
  int mat[][],r,c;

  matrix()
  {
     mat = new int[10][10];
  }
  public void getMat() throws Exception
  {
   // mat = new int[10][10];
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("\nEnter the Dim of the matrix : ");    
    r = Integer.parseInt(br.readLine());
    c = Integer.parseInt(br.readLine());

    System.out.println("\nEnter the matrix elements : ");    
    for(int i = 0 ; i < r ; i++)
    {
      for(int j = 0 ; j < c ; j++)
      {
        mat[i][j] = Integer.parseInt(br.readLine());
      }
    }
  }

  public void addMat(matrix m1,matrix m2)
  {
     r = m1.r;
     c = m1.c;

     for(int i = 0 ; i < r ; i++)
    {
       for(int j = 0 ; j < c ; j++)
       {
          mat[i][j] = m1.mat[i][j] + m2.mat[i][j];
       }
    }
  }

  public void putMat()
  {
    System.out.println("\nMatrix is : \n");
    for(int i = 0 ; i < r ; i++)
    {
      for(int j = 0 ; j < c ; j++)
      {
        System.out.print(" " + mat[i][j]);
      }
      System.out.println("");
    }
  }

  public static void main(String args[]) throws Exception
  {
    matrix m1 = new matrix();
    matrix m2 = new matrix();
    matrix m3 = new matrix();

    m1.getMat();
    m2.getMat();

    m1.putMat();
    m2.putMat();

    m3.addMat(m1,m2);
    m3.putMat();
  } 
}

Linear Search in Java

Below is simple program in java which shows the linear search.


import java.io.*;

class LinearSearch
{
  int ar[];
  int ele,n;

  public void setData() throws Exception
  {
     ar = new int[10];
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("Enter the size for array : ");    
    n = Integer.parseInt(br.readLine());

    System.out.println("Enter the data for array : ");    
    for(int i = 0 ; i < n ; i++)
    {
      ar[i] = Integer.parseInt(br.readLine());
    }
    
    System.out.println("Enter the data to be searched : ");
    ele = Integer.parseInt(br.readLine());
  }

  public void putData()
  {
    System.out.println("The array is : ");
    for(int i = 0 ; i < n ; i++)
    {
      System.out.println(" " + ar[i]);
    }
  }

  public void LinSrch()
  {
    int i;
   
    for(i = 0 ; i < n ; i++)
    {
      if(ar[i] == ele)
      {
        break;
      }
    }
    if(i == ar.length)
    {
      System.out.println("\nElement not found");
    }
    else
    {
      System.out.println("\nElement found at " + i);
    }
  }

  public static void main(String args[]) throws Exception
  {
    LinearSearch ln = new LinearSearch();
    ln.setData();
    ln.putData();
    ln.LinSrch();
  }

}