Practice questions on Let's program

class Ans{
  public static void main(String[] args){
    System.out.println("Hey there,\nI am data!");
  }
}

class Ans{
  public static void main(String[] args){
    System.out.println("*\n**\n***\n****");
  }
}

class Ans{
  public static void main(String[] args){
    System.out.println("*****\n *** \n  *  \n *** \n*****");
  }
}

class Ans{
  public static void main(String[] args){
    System.out.println(2+4+5);
  }
}

class Ans{
  public static void main(String[] args){
    System.out.println(45-32);
    System.out.println(45*32);
  }
}