METHODS - Introduction to Java Programming: Comprehensive Version - page 238

Use this method to write a program that prints a tax table for taxable income from
$50,000 to $60,000 with intervals of $50 for all the following statuses:

Taxable
Income

Single Married Joint

or Qualifying
Widow(er)

Married
Separate

Head of
a House

50000 8688 6665 8688 7353

50050 8700 6673 8700 7365

...
59950

11175 8158 11175 9840

60000 11188 8165 11188 9853

Hint : round the tax into integers using Math.round (i.e., Math
.round(computeTax(status, taxableIncome) ).

*6.16

( Number of days in a year ) Write a method that returns the number of days in a
year using the following header:

public static int numberOfDaysInAYear( int year)

Write a test program that displays the number of days in year from 2000 to 2020.

Sections 6.10-6.11
*6.17

( Display matrix of 0s and 1s ) Write a method that displays an n -by- n matrix using
the following header:

public static void printMatrix( int n)

Each element is 0 or 1, which is generated randomly. Write a test program that
prompts the user to enter n and displays an n -by- n matrix. Here is a sample run:

Enter n: 3
0 1 0
0 0 0
1 1 1

**6.18

( Check password ) Some websites impose certain rules for passwords. Write a
method that checks whether a string is a valid password. Suppose the password
rules are as follows:

A password must have at least eight characters.

■

A password consists of only letters and digits.

■

A password must contain at least two digits.

■

Write a program that prompts the user to enter a password and displays Valid
Password if the rules are followed or Invalid Password otherwise.

*6.19

( The MyTriangle class ) Create a class named MyTriangle that contains the
following two methods:

/** Return true if the sum of any two sides is
* greater than the third side. */
public static boolean isValid(
double side1, double side2, double side3)