Java Programs

1. Java program to find number of lines.

import java.io.*;

public class NOL
{
public static void main(String[] args) 
{
try
{
System.out.println("Getting line number of a paritcular file example!");
 BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
 System.out.println("Please enter file name with extension:");
   String str = bf.readLine();
   File file = new File(str);
   if (file.exists())
{
    FileReader fr = new FileReader(file);
   LineNumberReader ln = new LineNumberReader(fr);
  int count = 0;
  while (ln.readLine() != null){
 count++;
  }
  System.out.println("Total line no: " + count);
 ln.close();
  }
 else{
  System.out.println("File does not exists!");
  }
 }
 catch(IOException e){
 e.printStackTrace();
 }
 }
}

2. Java Program on method override.

class Base
{
void show()
{
System.out.println("inside the Base class method");
}
}

class Derive extends Base
{
void show()
{
System.out.println("inside the Dervied class method");
}
}

class Override
{
public static void main(String args[])
{
Derive d=new Derive();
d.show();
}
}

3. Java Program to print system time.

import java.util.*;
class Systime
{
public static void main(String args[])
{
Date d=new Date();
System.out.println(d.getHours() + ":"+ d.getMinutes() + ":" + d.getSeconds());
}
}

4. Java Program to demonstrate thread example.

class Ta extends Thread
{
public void run()
{
for(int i=1; i<=5; i++)
{
System.out.println("A thread=" + i);
}
System.out.println("Ta is over");
}
}

class Tb extends Thread
{
public void run()
{
for(int j=1; j<=5; j++)
{
System.out.println("B thread=" + j);
}
System.out.println("Tb is over");
}
}

class thread
{
public static void main(String args[])
{
Ta ta=new Ta();
ta.start();

Tb tb=new Tb();
tb.start();
}
}

5. Java Program without main().

class WithoutMain
{
static{
System.out.println("Hello world");
System.exit(0);
}
}

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