Reference no: EM132217606
Assignment
1. Write a complete program whose class name is Hello that displays Hello, world on the screen (with the quotation marks). Also in the program, declare an integer constant, MONTHS_IN_YEAR, whose value is 12, and display that number followed by months on a separate line.
2. Given two integer variables distance and speed, write an expression that divides distance by speed using floating point arithmetic, i.e. a fractional result should be produced.
3. Calculate the average (as a double) of the values contained in the integer variables num1, num2, num3 and assign that average to the double variable avg. Assume the variables num1, num2, and num3 have been declared and assigned values, and the variable avg declared.
Creating objects
4. Declare a reference variable of type File named myFile.
5. Declare a variable named myMenu suitable for holding references to Menu objects.
6. Suppose a reference variable of type File called myFile has already been declared. Create an object of type File with the initial file name input.dat and assign it to the reference variable myFile.
invoking methods
7. Assume that dateManager is a reference to an object that has a method named printTodaysDate, that accepts no arguments and returns no value. Write a statement that calls printTodaysDate.
8. Assume that dataTransmitter is a variable that refers to an object that provides a method, sendSignal that takes no arguments. Write the code for invoking this method.
9. Assume that dataTransmitter is a variable that refers to an object that provides a method, named sendObject. There is one argument for this method, a reference to a Customer object. Assume that there is a reference to an object of type Customer, in a variable called john_doe. Invoke the method, using this reference as your argument.
10. Assume there is a class AirConditioner that supports the following behaviors: turning the air conditioner on and off, and setting the desired temperature. The following methods provide these behaviors: turnOn and turnOff, which accept no arguments and return no value, and setTemp, which accepts an int argument and returns no value. Assume there is a reference variable officeAC of type AirConditioner.
Create a new object of type AirConditioner and save the reference in officeAC. After that, use the reference to turn on the new air conditioner object and set the desired temperature to 69 degrees.
Invoking static methods
11. Write the code for invoking a static method named sendDouble, provided by the DataTransmitter class. There is one double argument for this method. Assume that a double variable called x has already been declared and initialized to some value. Use this variable's value as an argument in your method invocation.
12. Assume the availability of a class named Logger that provides a static method, printLarger that accepts two int arguments and returns no value. Two int variables, sales1 and sales2, have already been declared and initialized. Write a statement that calls printLarger, passing it sales1 and sales2.