Java Reference
In-Depth Information
A constructor that constructs a Time object with a specified elapsed time since
midnight, January 1, 1970, in milliseconds. (The values of the data fields will
represent this time.)
A constructor that constructs a Time object with the specified hour, minute, and
second.
Three get methods for the data fields hour , minute , and second , respec-
tively.
A method named setTime(long elapseTime) that sets a new time for the
object using the elapsed time. For example, if the elapsed time is 555550000
milliseconds, the hour is 10 , the minute is 19 , and the second is 10 .
Draw the UML diagram for the class and then implement the class. Write a
test program that creates two Time objects (using new Time() and new
Time(555550000) ) and displays their hour, minute, and second in the format
hour:minute:second.
( Hint : The first two constructors will extract the hour, minute, and second from the
elapsed time. For the no-arg constructor, the current time can be obtained using
System.currentTimeMillis() , as shown in Listing 2.6, ShowCurrentTime.java.)
10.2
( The BMI class ) Add the following new constructor in the BMI class:
/** Construct a BMI with the specified name, age, weight,
* feet, and inches
*/
public BMI(String name, int age, double weight, double feet,
double inches)
10.3
( The MyInteger class ) Design a class named MyInteger . The class contains:
An int data field named value that stores the int value represented by this
object.
A constructor that creates a MyInteger object for the specified int value.
A get method that returns the int value.
The methods isEven() , isOdd() , and isPrime() that return true if the
value in this object is even, odd, or prime, respectively.
The static methods isEven(int) , isOdd(int) , and isPrime(int) that
return true if the specified value is even, odd, or prime, respectively.
The static methods isEven(MyInteger) , isOdd(MyInteger) , and
isPrime(MyInteger) that return true if the specified value is even, odd, or
prime, respectively.
The methods equals(int) and equals(MyInteger) that return true if the
value in this object is equal to the specified value.
A static method parseInt(char[]) that converts an array of numeric charac-
ters to an int value.
A static method parseInt(String) that converts a string into an int value.
Draw the UML diagram for the class and then implement the class. Write a client
program that tests all methods in the class.
10.4
( The MyPoint class ) Design a class named MyPoint to represent a point with x -
and y -coordinates. The class contains:
The data fields x and y that represent the coordinates with get methods.
A no-arg constructor that creates a point ( 0 , 0 ).
A constructor that constructs a point with specified coordinates.
Two get methods for the data fields x and y , respectively.
VideoNote
The MyPoint class
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