CBSE Class 12 Informatics Practices Java GUI Programming Revision Tour Assignment

JAVA GUI PROGRAMMING REVISION TOUR – II [Swing Controls]

SOLVED QUESTIONS

1.What does getPassword() on a password field return?

 (a) a string (b) an integer (c) a character array.

Ans: (c) a character array

2. Which of the following component is the best suited to accept the country of the user? 

A. List B. Combo box C. Radio button D. Check box

Ans: B. Combo box

3. What command do you need to write in actionPerformed() event handler of a button, in order to make it exit button? 

a. System.out.println(); b. System.exit(0); c. System.out.print()

Ans: b. System.exit(0);

4.What method would you use, in order to simulate a button’s(namely Okbtn) click event, without any mouse activity from user’s side?

 a. Okbtn.setText() b.Okbtn.getText() c. Okbtn.doClick()

Ans: Okbtn.doClick()

5. What would be the name of the event handler method in the ListSelection listener interface for a list namely CheckList to handle its item selections? 

a. CheckListValueChanged() b. getSelectedValue() c. clearSelection()

Ans: a. CheckListValueChanged()

6. Which control displays text that the user cannot directly change or edit? 

a.TextField b. Checkbox c. Combobox d. Label

Ans: d.Label

7.Which control provides basic text editing facility? a.TextField b. Checkbox c. Combobox d. Label

Ans: a. TexfField

8. Occurrence of an activity is called: a. Function b. Class c. Object d. Event

Ans: d.Event.

9. Which property is used to set the text of the Label? a. font b.text c.name d. icon

Ans: b.text

10. The object containing the data to be exhibited by the combo box by which property. a. editable b. model c.selectedIndex d.selectedItem

Ans: b. model

11. What is GUI programming?

Ans: A GUI(Graphical User Interface) is an interface that uses pictures and other graphic entities along with text, to interact with user.

12. How is swing related to GUI programming?

Ans: We can create a GUI application on Java platform using Swing API (Application Programming Interface), which is part of Java Foundation Classes(JFC).

13. What is an event? What is event handler?

Ans: An event is occurrence of some activities either initiated by user or by the system. In order to react, you need to implement some Event handling system in your Application. Three things are important in Even Handling- Event Source: It is the GUI component that generates the event, e.g. Button. Event Handler or Event Listener: It is implemented as in the form of code. It receives and handles events through Listener Interface. Event Object or Message: It is created when event occurs. It contains all the information about the event which includes Source of event and type of event etc.

14. What is the default name of action event handler of a button namely TestBtn?

Ans: private void TestBtnActionPerfomed(java.awt.action.ActionEvent evt){ }.

Please refer to attached file for CBSE Class 12 Informatics Practices Java GUI Programming Revision Tour Assignment