ex3) Java Thread - Synchronization

 

// when using messenger ->for(;;){};not Threadby using enabling other tasks simultaneously
// server since message don't know when arriving.. continuously thread running execution,
// if using loop simultaneously other tasks not possible!

 

/*
public class ThreadTest extends Thread {
 
 public void printNumber() { // 0to screen from 0 to 1 output method
  for( int i=1 ; i<=20 ; i++ ) {
  System.out.println( "number = " + i );
  }
 }
 
 // Runnable interface run() overriding
 public void run() {
  printNumber(); //call
 } // definition
 
 public static void main( String[] args ) {
  ThreadTest tt = new ThreadTest();  // object creation
  tt.start(); // Thread start it
                 // process :
                 // JVM request -> run()execution-> 
                 // printNumber()-> below'sSystem.out.println execution
  System.out.println( "--------> main thread end" );

 }
}//bug : order wrong , most last ends "main thread" must be .

**/

/*
   structure
         object :wait,notify,notifyAll
         -> Thread :start, stop  (+ <- runnable interface(public void run()))
         -> ThreadTest : parent all + printNumber()
 **/

 

 
 

/*
public class ThreadTest extends Thread {
 
 public void printNumber() { // 0to screen from 0 to 1 output method
  for( int i=1 ; i<=20 ; i++ ) {
  System.out.println( "number = " + i );
  }
 }
 
 // Runnable interface run() overriding
 public void run() {
  printNumber(); //call
 } // definition
 
 public static void main( String[] args ) {
  ThreadTest tt = new ThreadTest(); // object creation
  tt.start(); // Thread start it
                 // process :
                 // JVM request -> run()execution-> 
                 // printNumber()-> below'sSystem.out.println execution
                 // main()within to screen 101 120to output

  for( int i=101 ; i<=120 ; i++ ) {
  System.out.println( "-------> main number = " + i );
  }//however computer depending on performance order can.
 }
}**/

 

 

/*
public class ThreadTest extends Thread {
 
 public void printNumber() { // 0to screen from 0 to 1 output method
  for( int i=1 ; i<=20 ; i++ ) {
  System.out.println( "number = " + i );
  }
 }
 
 // Runnable interface run() overriding
 public void run() {
  printNumber(); //call
 } // definition
 
 public static void main( String[] args ) {
  ThreadTest tt = new ThreadTest();  // object creation
  tt.start(); // Thread start it
                 // process :
                 // JVM request -> run()execution->
                 // printNumber()-> below'sSystem.out.println execution
                 // main()within to screen 101 120to output
 
  tt.join();   //-> try catch codeblockneeded!
  }
 }
}**/

 

 

 

/*
public class ThreadTest extends Thread {
 
 public void printNumber() { // 0to screen from 0 to 1 output method
  for( int i=1 ; i<=20 ; i++ ) {
  System.out.println( "number = " + i );
  }
 }
 
 // Runnable interface run() overriding
 public void run() {
  printNumber(); //call
 } // definition
 
 
 public static void main( String[] args ) {
 
  ThreadTest tt = new ThreadTest(); // object creation
  tt.start(); // Thread start it
 
  try{
   tt.join();
  }catch(InterruptedException e){}
 
  System.out.println( "-------> main number = ");
 }

 

 

 

/*
public class ThreadTest extends Thread {
 
 public void printNumber() { // 0to screen from 0 to 1 output method
  for( int i=1 ; i<=20 ; i++ ) {
  System.out.println( "number = " + i );
  }
 }
 
 // Runnable interface run() overriding
 public void run() {
  System.out.println(Thread.currentThread());//orderof
  printNumber(); //call
 } // definition
 
 public static void main( String[] args ) {
 
  ThreadTest tt = new ThreadTest();  // object creation
  tt.start();// Thread start it
  System.out.println(tt.getPriority());//orderof
 
  try{
   tt.join();
  }catch(InterruptedException e){}
 
  System.out.println( "-------> main number = ");
 }
}**/

 

 

public class ThreadTest extends Thread {
 
 public void printNumber() {
  for( int i=1 ; i<=20 ; i++ ) {
  System.out.println( "number = " + i );
  }
 }
 

 public void run() {
  System.out.println(Thread.currentThread());
  printNumber(); 
 } 
 
 public static void main( String[] args ) {
  ThreadTest tt = new ThreadTest();
  tt.start();
  tt.setPriority(9); // priority specify!!!
  System.out.println(tt.getPriority());
  try{
   tt.join();
  }catch(InterruptedException e){}
  System.out.println( "-------> main number = ");
 }
}