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Lecture 4 Exercises Writing Applications
Lecture 4 Exercises Writing Applications
Part 1 Writing Command-Line Applications
Programming Tips
The length of an array can be checked with its length property, i.e. arrayName.length
Use the System.out.println(
) method to write to the console.
Use the System.exit(
) method to exit the application. A parameter of zero means a normal exit, a parameter of one means an error was encountered.
To convert a String into an integer use the Integer.parseInt() method
String constants can be declared as:
public static final String MY_STRING = myStringValue;
Use the new operator to create a new object, e.g. new Calculator(x, y).
The Javadoc for the Java API can be found at: //java.sun.com/j2se/1.4.1/docs/api/index.html
Exercises
1. Write a simple application that when run simply writes out Hello World to the console.
2. Write a simple application that loops through the array containing its command-line parameters, writing each of them to the console (Tip: check the javadoc for java.lang.String):
a. In upper case
b. and include the length of each string.
3. Write a simple command-line calculator as described by the UML diagram below. The calculator should be able to accept the following command line parameters:
a. The first number
b. An operator. One of the following strings: plus, minus, times, divide
c. A second number
The calculator should then print out the results of the calculation. If an incorrect number of arguments are provided, or the user types in an unknown operator, then the program should exit with an appropriate message.
| Create Date : 06 กุมภาพันธ์ 2554 |
| Last Update : 6 กุมภาพันธ์ 2554 8:54:59 น. |
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