Question

Answers to Self-Review Exercises 625 14.3 d) In a BorderLayout, two buttons added to the NORTH region will be placed side by side. e) A maximum of five components can be added to a BorderLayout ) Inner classes are not allowed to access the members of the enclosing class. B) A TextArea's text is always read-only. h) Class TextArea is a direct subclass of class Component. Find the error(s) in each of the following statements, and explain how to correct it (them) a) button ane - JButton "Caption" ); b) Label alabel, JLabel; // create references c) txtField-new JTextField( 50. "Default Text"): d) setLayout(new BorderLayout ): button = new Button "North Star" ); button2 - new JButton "South Pole"); add button!): add button2 ): Answers to Self-Review Exercises 14.1 a) mouseoved. b) uneditable (read-only). c) layout manager. d) Container. e) graphical user interface. ) setlayout.) mouse Pressed, mouseReleased. h) OptionPane. showinput log, OptionPane. j) showessageDialog. OptionPane. k) JTextComponent. 14.2 a) True b) False. Method nous entered is called c) Faly A JPanel can be added to another JPane1, because JPanel is an indirect subclass of cooponent. So, a Panel is a Component. Any Component can be added to a Container d) False. Only the last button added will be displayed. Remember that only one compo nent should be added to each region in a Border Layout e) True. (Note: Panels containing multiple components can be added to cach region. False. Inner classes have access to all members of the enclosing class declaration. B) False. JTextAreas are editable by default. h) False JTextArea derives from class JTextComponent. a) new is needed to create an object. b) Label is a class name and cannot be used as a variable name. c) The arguments passed to the constructor are reversed. The string must be passed first d) Borderlayout has been set, and components are being added without specifying there gion, so both are added to the center region. Proper add statements might be add button, Border Layout. NORTH); ad button. BorderLayout. SOUTH ): Exercises 14.4 Fill in the blanks in each of the following statements: a) The JTextField dass directly extends class b) Container method attaches a GUI component to a container c) Method is called when a mouse button is released (without moving the mouse d) The class is used to create a group of Radiobuttons. Determine whether each statement is true or fake Iffle, explain why. a) Only one layout manager can be used per Container b) GUI components can be added to a Container in any order in a BorderLayout c) Radioluttons provide a series of mutually exclusive options (ie only one can be true at a time)

i want answers please ???

Answer 1

Note: Only one question is allowed at a time, but as questions are small I have done most of them. Please comment for any problem. Please Uprate. Thanks. Rest you have to ask each question separately.

14.4

a) JTextComponent

b) add

c) mouseClicked

d) ButtonGroup

14.5

a) True

b) True

c) True

d) False, Component method setFont is used

e) False, a JList never provides a scrollbar

f) False, a Mouse object is not provided by Java

14.6

a) True

b) True

c) True

d) False, a JList is a JComponent

e) False, a JButton is an AbstractButton

f) True

g) False, ButtonGroup inherits from Object

14.7

a) semicolon is mised after the class name.

b) The GridLayout constructor cannot be used in this manner. The correct statement should be:

panelObject.getContentPane().setLayout( new GridLayout (8, 8));

c) Class FlowLayout does not contain static constant DEFAULT.

d) EAST should be BorderLayout.EAST

14.8

import javax.swing.*;

import java.awt.*;

public class Align extends JApplet {

   private JButton ok, cancel, help;

   private JTextField xValue, yValue;

   private JCheckBox snap, show;

   private JLabel xLabel, yLabel;

   private JPanel checkPanel, buttonPanel,

                  fieldPanel1, fieldPanel2,

                  fieldPanel;

   public void init()

   {

      // build checkPanel

      snap = new JCheckBox( "Snap to Grid" );

      show = new JCheckBox( "Show Grid" );

      checkPanel = new JPanel();

      checkPanel.setLayout( new GridLayout( 2 , 1 ) );

      checkPanel.add( snap );

      checkPanel.add( show );

      // build field panel1

      xLabel = new JLabel( "X: " );

      xValue = new JTextField( "8", 3 );

      fieldPanel1 = new JPanel();

      fieldPanel1.setLayout( new FlowLayout( FlowLayout.CENTER, 3, 5 ) );

      fieldPanel1.add( xLabel );

      fieldPanel1.add( xValue );

      yLabel = new JLabel( "Y: " );

      yValue = new JTextField( "8", 3 );

      fieldPanel2 = new JPanel();

      fieldPanel2.setLayout( new FlowLayout( FlowLayout.CENTER, 3, 5 ) );

      fieldPanel2.add( yLabel );

      fieldPanel2.add( yValue );

      fieldPanel = new JPanel();

      fieldPanel.setLayout( new BorderLayout() );

      fieldPanel.add( fieldPanel1, BorderLayout.NORTH );

      fieldPanel.add( fieldPanel2, BorderLayout.SOUTH );

     

      // build button panel

      ok = new JButton( "Ok" );

      cancel = new JButton( "Cancel" );

      help = new JButton( "Help" );

      buttonPanel = new JPanel();

      buttonPanel.setLayout( new GridLayout( 3, 1, 10, 5 ) );

      buttonPanel.add( ok );

      buttonPanel.add( cancel );

      buttonPanel.add( help );

      // set layout for applet

      getContentPane().setLayout(

            new FlowLayout( FlowLayout.CENTER, 10, 5 ) );

      getContentPane().add( checkPanel );

      getContentPane().add( fieldPanel );

      getContentPane().add( buttonPanel );

   }

}

Output:

- D X Applet Viewer: Ali... Applet Ok Snap to Grid Show Grid X: 8 Y: 8 Cancel Help