Thread Threat

[vinci123]

what is the basic concept of thread ?I have read E.Balagurusamy and found threads running and exits according to priority but in case we have more threads and all having same priority than what would happen?Do tell me role of main method and execution terms of main method in threads?

[Petr]

Hi. Java works with thread through native OS functions. Just read about how to realization this functions in special OS.
Regard.

PS What is mean Balagurusamy? :)

[vinci123]

Hi. Java works with thread through native OS functions. Just read about how to realization this functions in special OS.
Regard.

PS What is mean Balagurusamy? :)

Balagurusamy is a well known Indian author of Java .He wrote several Standard books in java .I have read that one last night .

[vinci123]

give me some real world examples of threads utility .

[Norm]

Reading data from the internet while responding to a user's requests on a GUI

[Tolls]

Riffing off Norm's post, threads are used by most every web server.
One thread per request coming in (up to some thread limit).

[vinci123]

sometimes i have seen we dint even inherit thread class nor interface runnable
just by this statement ,programme runs
Thread th =new thread();
i dint understand why this happens?

[Norm]

Thread th =new thread();

What is the code in the thread class? Does it extend the Thread class? Remember java is case sensitive, so I'm talking about 2 different classes.

[Grkn]

I think thread() class is coded by programmer else that is wrong. Every thing is object in java. implementation is wrong but you can make smthg like that
ex:
public class myThread extends Thread{

public myThread(){

super ();

}

} // by this way you can add some other methods in Thread class and improve the class.

I will simply explain thread in java.

Thread is kind of process that runs the program.

First difference of process and thread is important

-process is a thread as well but you can not use process in process.
-You can use threads in process.

You can call process as main thread. In C that is a little different. (In C you use fork() to create thread .....)

DataStructure are like tree;
Process is the root;
Threads are child or node;

I can not explain structure of thread You can look in google or book;

Second : In java when you run a program , process begins;
In Process you can create threads that can make some independant work

Simple example from this web site:> When you are writing reply you can see that Auto-Saved. Just like MS Word when you are writing in word program it automaticly saves content of word page. That means there are at least 2 thread (There are more than 2 thread) 1 thread handles writing second thread saves content when you are writing.
1 thread only manages 1 job at the same time. You can not use 1 thread to do 2 works in sample period of time so you create second thread to handle that issue.

----------------------------------------END OF THREAD PURPOSE------------------------

Thread th=new Thread();
// your quesiton:> Thread is class you can get instance of Thread class but you have to make some modifications;
Ex:

Thread th=new Thread(){@Override public void run(){ System.out.println("HI");// implement some code for thread will deal}};
th.start();
System.out.println("HELLO");
If you write this code to somewhere in method It will print HI and at the same time your program handles other jobs.


I will mention about instance; // Just think that when you get instance of class (new Thread()), you creates a special memory for that class (Classes have Fields(int a,String b,.....) ,METHODS,MEMBERS..... as you know); For example: if you do not get instance, you can not use that classes' attributes(Fields); I will not explain static,dynamic variables

Not every class can be got instance by user; //some class types : abstract class, Enum , interface, // you have to read them
but all public classes can be got instance by user. //Even if they have private constructors .... I will just skip this explanation
//my thoughts
At last main class :>> If you know about nested class, main is nested class and anonymous class type.
public static void main(String [] args) // First I will explain main properties.
First it has to be public to access
Second it has to be static because static variables or classes are created in runtime. //I do not know in java but static variables can be kept to cache for improve performance
static variables can be accessed from every where // GLOBAL Variables
Third if you write a programing language you need a specific class that you will need when runing program //Like in C, main is special class.

String []args // if your program needs input from outside you can use it
main thread is a main process of java --> As I said in above, Process is main thread. Root of java threads

// For more information you search JVM , JIT , .....