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Some programs we developed in class today:
class One {
public static void main(String[] args) {
String word = "";
char letter;
for (int i = 0; i < 8; i++) {
int value = (int)(Math.random() * (1 + 'z' - 'a'));
letter = (char) (value + 'a');
word = word + letter;
}
System.out.println(word);
}
}1. Consider the following 'nonsense class'.
class A
{ public A() { n = 0; }
public A(int a) { n = a; }
public void f() { n++; }
public void g() { f(); n = 2 * n; f(); }
public int h() { return n; }
public void k() { System.out.println(n); }
private int n;
}
What kind of variable is n?
2. With the nonsense class from the preceding exercise, determine what the following program prints.
public static void main(String[] args) {
A a = new A();
A b = new A(2);
A c = b;
A d = new A(3);
a.f(); b.g(); c.f(); d.g();
d.k();
A e = new A(a.h() + b.h() + c.h());
e.k();
}Do not actually compile and run the program.
Then run it and compare the results.
3. Implement all the methods of the following class:
class Person {
Person() { ... }
Person(String givenName, int yearOfBirth) { ... }
String getName() { ... }
String changeName(String name) { ... }
int getAgeInYears(int currentYear) { ... }
private String name;
private int birthdayYear;
}Person as well.
4. Implement a class Address. An address has
print function that prints the address with
Supply a method compareTo that
5. Implement a class Account. An account has
balance,
add
withdraw money,
inquire the current balance.
If no value is passed the initial balance should be set to $0.
Charge a $5 penalty if an attempt is made to withdraw more money
than available in the account.
Enhance the Account class to compute interest
on the current balance.
6. Implement a class Bank. This bank has two objects
checking
savings
Account that was developed in the preceding
exercise. Implement four instance methods:
deposit(double amount, String account)
withdraw(double amount, String account)
transfer(double amount, String account)
printBalances()
"S" or "C":
7. Define a class Country.
An object of type Country will store
8. Write a class called Triangle that can be used to
represent a triangle. It should include the following methods that
return boolean values indicating if the particular
property holds:
isRight (a right triangle)
isScalene (no two sides are the same length)
isIsosceles (exactly two sides are the same length)
isEquilateral (all three sides are the same length)
Note: I
will post solutions for problems 1-8 tonight. I think you'd benefit from
trying to solve them, and when I post the solutions you could check your
solutions against those posted.