Which of the following statements does NOT describes the features of a grid layout

Questions

In each of the following questions, choose the layout manager(s) most naturally suited for the described layout. Assume that the container controlled by the layout manager is a JPanel.

Question 1. The container has one component that should take up as much space as possible

a. BorderLayout
b. GridLayout
c. GridBagLayout
d. a and b
e. b and c

Answer 1: d. BorderLayout and GridLayout easily deal with this situation. Although you could use GridBagLayout, it's much more complex than necessary.

Question 2. The container has a row of components that should all be displayed at the same size, filling the container’s entire area.

a. FlowLayout
b. GridLayout
c. BoxLayout
d. a and b

Answer 2: b. This type of same-size layout — whether in a row, a column, or a grid — is what GridLayout is best at.

Question 3. The container displays a number of components in a column, with any extra space going between the first two components.

a. FlowLayout
b. BoxLayout
c. GridLayout
d. BorderLayout

Answer 3: b. BoxLayout lays out components in either a column or a row. You can specify extra space using an invisible component.

Question 4. The container can display three completely different components at different times, depending perhaps on user input or program state. Even if the components’ sizes differ, switching from one component to the next shouldn’t change the amount of space devoted to the component.

a. SpringLayout
b. BoxLayout
c. CardLayout
d. GridBagLayout

Answer 4: c. CardLayout exists to allow components to share the same space. Although it's simpler to use a JTabbedPane component to control an area, CardLayout is the solution when you don't want tabs.

Exercises

Exercise 1. Implement the layout described and shown in question 1.
Answer 1: See Layout1.java

JPanel p = new JPanel(new BorderLayout());
p.add(createComponent("Component 1"),
                      BorderLayout.CENTER);
frame.setContentPane(p);

Exercise 2. Implement the layout described and shown in question 2.
Answer 2: See Layout2.java

JPanel p = new JPanel(new GridLayout(1,0));
p.add(createComponent("Component 1"));
p.add(createComponent("Component 2"));
p.add(createComponent("Component 3"));
p.add(createComponent("Component 4"));
frame.setContentPane(p);

Exercise 3. Implement the layout described and shown in question 3.
Answer 3: See Layout3.java

JPanel p = new JPanel();
p.setLayout(new BoxLayout(p, BoxLayout.PAGE_AXIS));
p.add(createComponent("Component 1"));
p.add(Box.createVerticalGlue());
p.add(createComponent("Component 2"));
p.add(createComponent("Component 3"));
p.add(createComponent("Component 4"));
frame.setContentPane(p);

Exercise 4. Implement the layout described and shown in question 4.
Answer 4: See Layout4.java

...//Where the radio buttons are set up:
for (int i= 0; i < strings.length; i++) {
    ...
    rb[i].setActionCommand(String.valueOf(i));
    ...
}

...//Where the panel to contain the shared-space components is set up:
cards = new JPanel(new CardLayout());
for (int i = 0; i < strings.length; i++) {
        cards.add(createComponent(strings[i]), String.valueOf(i));
}

...//In the action listener for the radio buttons:
public void actionPerformed(ActionEvent evt) {
        CardLayout cl = (CardLayout)(cards.getLayout());
        cl.show(cards, (String)evt.getActionCommand());
}

Exercise 5. By adding a single line of code, make the program you wrote for Exercise 2 display the components from right-to-left, instead of from left-to-right.

Answer 5: You can change the horizontal orientation using the setComponentOrientation method defined by the Component class. For example:

p.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);

What is a disadvantage of the grid layout quizlet?

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