public class HelloJava {
	
	public static void main(String[] args) {
		System.out.println("Hello Java Simple");
		Teacher t = new Teacher();
		System.out.println(t);

		//Student s = new Student("Tom");
		//System.out.println(s);
	}
}

class Teacher {
	
	private String name;
	private int age;
	
	
}



class Test2 {
	
	public static void main(String[] args) {
		System.out.println("Test2. main");
	}
	
}

public class Student{

	private String name;

	public Student(String name){
		this.name = name;
	}

}

java HelloJava.java