CS 121 Lecture Notes - Lecture 26: Layout Manager, Enter Key

20 views5 pages

oliveyellowjacket981

28 Feb 2017

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

A jbutton generates an action event when it is pushed: the listener class we write will be an action event listener, we define a class called buttonlistener to represent the listener for this event. The relationship between a listener & its gui is one of the few situations in which an inner class is appropriate. Listener classes are written by implementing an interface: a list of methods that the implementing class must define. The java standard class library contains interfaces for many types of events. An action listener is created by implementing the actionlistener interface: therefore, we include the implements clause in the buttonlistener class. The only method listed in the actionlistener interface is the actionperformed method, so that"s the only method that the. Text fields: ex: the fahrenheit program presents a gui that includes a text field into which the user can type a fahrenheit temperature.

Related Questions

9. Finally, you should write a program MontrealMaps which will suggest a path to go along the metro to get from one place to another. The only required method for MontrealMaps is a main method but of course you are allowed to write others. Your program should do the following. For any library methods that you use, make sure that you are properly importing things and handling any exceptions they may throw. (10 points) • Using an appropriate library method, you should create a Subway System object. If this method fails to initialize, you should print the message Error, not enough funding. • Use a Scanner and print statements to read the current x and y position of the user. • Use a Scanner and print statements to read the x and y position that the user wants to go to. . Find the nearest Metro Station to both the start position of the user and his final destination. • If the 2 metro stations have the same name (i.e. are the same metro station) then print It is fastest to walk there. • Otherwise, call the method findPath from the previous part to find a path from these 2 metro stations. . If the method returns null, then print Sorry, there is no path on the metro, you'll have to walk • Otherwise, print the path using the metro using the method printPath defined in the MapUtilities class in the appendix. SUMMARY OF JAVA STANDARD LIBRARY METHODS POR SELECTED CLASSES • String package java.lang) Methods - public boolean gist and e rs is stingeancoject - puble boolean grease Sering another ca t ering String paint i th Stre C h eshilly before the Stripe with striert w Single weiter water N ENE fusha -publish tohy Casting de . File( p age java.io) Methods r eate - publie Yiling path : C • Scanner (package java.ut 1) Method -ple S ule - double Double Sc - le bon when : S Scanner tal de fethede h able othebean - puble String Best Mus eethe u s tepal -pulle haalean haxtLine: Check the hea ther in left PrintStream( p age java.io) Methods pul vaid pri Pribonaat - puli wid pride d oble vile. - pille vaid print Print vei. -pulle vaid printject o: Prints Object -puli vaid printString : Prints String .. - vaid primi The theme line by writing the li n e tie id print in bool bl. Prise n value the - public void platinabled Prints double ved and then the line - public void printit Prints Ent value and then tomis the - Pull vaid pri l l be t he minime publie wild prin t ing with String in the terminates the line • ArrayLiat package java.util) Methods - public boolean Arraybettype was a new ArrayList

CS 121 Lecture Notes - Lecture 26: Layout Manager, Enter Key

Document Summary

Get access

Related Documents

CS 121 Lecture Notes - Lecture 25: Graphical User Interface, Java Class Library

CS 121 Lecture 31: Determining Event Sources

CS 121 Lecture Notes - Lecture 48: Init, Applet

Related Questions