Problem 24
Write a program simply prints "Wonder of objects" inside the main method. Without using any print statement or concrete methods or dot operators inside the main method.
Problem 25
A class weight is having a data member pound, which will have the weight in pounds. Using a conversion function, convert the weight in pounds to weight in kilograms which is of double type. Write a program to do this. 1 pounds \(=1 \mathrm{~kg} / 0.453592\) Use default constructor to initial assignment of 1000 pounds.
Problem 27
Which of the following signatures is valid for the main () method? Justify. (a) public static void main(String \(\mathrm{rk}[]\) ) (b) static public void main(String argv) (c) public static void main(String [] args) (d) public static int main(String \(\operatorname{args}[])\)
Problem 29
For a class Animal, write a method sleeps() that uses only one instance variable of Animal. The code Animal a = new Animal ("fido","woof"); a.sleep(); causes the output fido is sleeping
Problem 30
Define overloaded method and illustrate your definition with a concise and appropriate Java example or your own. Do not use a built-in method as your example; write one of your own.
Problem 32
Consider the following class: class JPS { private int var; //.................. public static void JPS1() { JPS a = new JPS(); System.out.println(a.var); } //................. } Does this compile? Does static method JPS1 reference an instance variable? Why is it allowed here?
Problem 33
College students typically have at least the following properties: last name, first name, major, home, city, and home state. Following the guidelines of this chapter design a class Student. Write and run drivers that test and demonstrate the capabilities you have built into your class.
Problem 34
Consider the following code: class JPS { private int var; //................. public static void JPS1() { System.out.println(var); } //................. } It will not compile. Explain why.
Problem 35
How does Java react if we use private instead of public? Explain.
