class student {
  int id;
  String name;
}
class x1 {
  public static void main (String args[]) {
     student x;
     x = new student();
     x.id = 101;
     x.name = "thanom";
     System.out.println(x.id + "  " + x.name);
  }
}

class x1 {
  // this program error on compile
  // error on theory of this
  x1() { System.out.print("ketsarin"); }
  public static void main (String args[]) {
    this();
  }
}

class x2 {
  x2() { this('a'); } // แต่ใช้ x2('a') ไม่ได้
  x2(char y) { System.out.println(y); }
}
class x1 {
  public static void main (String args[]) {
    new x2();
  }
}// output : a

class student {
  student(String x) {
    System.out.println(x);
    n = x;
  }
  public String n;
}
class x1 {
  public static void main (String args[]) {
    student s = new student("atichart");
    System.out.println(s.n);
    s = new student("tatsanee");
    s = new student("wichep");
  }
}

class x1 {
  public static void main (String args[]) {
  b: for (int i=0;i<5;i++) {
       if (i == 2) break b; else System.out.print(i);
	 }
     for (int i=0;i<5;i++) {
       if (i == 2) continue; else System.out.print(i);
     }
     x2();
     System.out.print(8);
     System.out.print(x3());
  }
  public static void x2 () {
    for (int i=0;i<5;i++) {
      if (i == 2) return; else System.out.print(i);
    }    
    System.out.print(10);
  }
  public static int x3 () {
    System.out.print(7);
	return (6);
  }
} // Output : 01013401876

class x1 {
public static void main(String args[]) {
  Thread t = Thread.currentThread();
  System.out.println(t.getName());      // main
  sleep1();
  System.out.println(t.getPriority());  // 5
  sleep1();
  System.out.println(t.isAlive());      // true
  sleep1();
  System.out.println(t.isDaemon());     // false
}
public static void sleep1 () {
  try {
    Thread.sleep(1000);	  
  } catch (InterruptedException e) { }
}
}

class x2 {
public static void main(String args[]) {
  new mthread("a").start();
  new mthread("b").start();
}
} // output : random of aaaaaaabbbbbbbbb
class mthread extends Thread {
  mthread(String n) { super(n); }
  public void run() {
    for(int i=0;i<200;i++) 
       System.out.print(getName());
  }
} 

class x3 {
public static void main(String args[]) {
  new mthread("a").t.start();
  new mthread("b").t.start();
}
} // output : random of aaaaaaabbbbbbbbb
class mthread implements Runnable {
  Thread t;
  mthread(String n) { t = new Thread(this,n); }
  public void run() {
    for(int i=0;i<200;i++) 
       System.out.print(t.getName());
  }
}