• A thread is a basic processing unit to which an operating system allocates processor time, and more than one thread can be executing code inside a process.
• Every Java program has at least one thread, the thread that executes the Java program. It is created when you invoke the static main method of your Java class.

1. Extend the java.lang.Thread class
2. Implement the java.lang.Runnable interface.

1. Thread object is created using new key word, then invoke "start "method to activate the thread.
2. When a thread is started, its run method is executed.
3. When the run method returns or throws an exception, the thread dies and get cleaned with garbage collection.
4. Thread can't be generic

1. new. A state in which a thread has not been started.
2. runnable. A state in which a thread is executing.
3. blocked. A state in which a thread is waiting for a lock to access an object.
4. waiting. A state in which a thread is waiting indefinitely for another thread to perform an action.
5. timed__waiting. A state in which a thread is waiting for up to a specified period of time for another thread to perform an action.
6. terminated. A state in which a thread has exited.

//import java.lang.reflect.*;
import java.io.*;
import java.net.*; // for datagram
public class Test_this extends Thread {
static public void main( String[] args )throws IOException
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("-->Welcome to thread building<--");
System.out.print("type name ");
String str = br.readLine();
Thread t = Thread.currentThread();
if(t.isAlive())
{
System.out.println( " get name '" + t.getName()+ "' 'id' " + t.getId());
}
thread_this tt = new thread_this();
tt.process_thread(str);
} }
class thread_this extends Thread{
public static void process_thread(String str)
{
Thread t = new thread_this();
t.setName(str);
t.start();
System.out.println( " get name " + t.getName()+ " id " + t.getId());
}

}
 

//import java.lang.reflect.*;
import java.io.*;
import java.net.*; // for datagram
public class Test_this extends Thread {
static public void main( String[] args )throws IOException
{
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("-->Welcome to thread building<--");
System.out.print("type name ");
String str = br.readLine();
Thread t = Thread.currentThread();
if(t.isAlive())
{
System.out.println( " get name " + t.getName()+ " id " + t.getId());
}
System.out.println( " --- " );
thread_this t_this = new thread_this();
//thread_that t_that = new thread_that();
t_this.process_thread(str);

} }
class thread_this extends Thread{

public static void process_thread(String str)
{
Thread t = new thread_this();
t.setName(str);
t.start();
Thread nt;
String s = "";
System.out.println( " get name " + t.getName()+ " id " + t.getId());
System.out.println( "get.State() " + t.getState());
System.out.println( "getPriority " + t.getPriority());
for (int i =1; i < 4; i++)
{
nt = new Thread(s = str+ i);
System.out.println("\tThread : "+ i);
System.out.println( " get name " + nt.getName()+ " id " + nt.getId() + " state " + t.getState());
}
}
}