Interested to Buy Any Domain ? << Click Here >> for more details...
I Have a class abstract with one abstract method, so that
method should override in the subclass, but i dont want to
override, if i am not override what will happen? If
compilation will occur then i dont want to give compilation
error, then what we need to do???
See the sample program.
public abstract class AbstractExample {
public abstract void sampleMethod();
}
public class AbstractExampleImple extends AbstractExample {
}
- 2 Answers
- 6044 Views
- Mphasis, I also Faced
- E-Mail Answers
Answer Posted / kvsravindrareddy
Normally abstract method should implement in the subclass,
otherwise application will give compilation error. If you want
to without compilation error, then subclass also make as a
abstract class, application will not give any compilation
error.
See the below sample code.
public abstract class AbstractExample {
public abstract void sampleMethod();
}
public abstract class AbstractExampleImple extends
AbstractExample {
}
| Is This Answer Correct ? | 20 Yes | 0 No |
Post New Answer View All Answers
What is a pointer and does java support pointers?
Discuss about garbage collector in Java.
What do you understand by the term string pool?
Question 5 [15] Consider the following classes, illustrating the Strategy design pattern: import java.awt.*; abstract class Text { protected TextApplet tA; protected Text(TextApplet tApplet) { tA = tApplet; } abstract public void draw(Graphics g); } class PlainText extends Text { protected PlainText(TextApplet tApplet) { super(tApplet); } public void draw(Graphics g) { g.setColor(tA.getColor()); g.setFont(new Font("Sans-serif", Font.PLAIN, 12)); g.drawString(tA.getText(), 20, 20); } } class CodeText extends Text { protected CodeText(TextApplet tApplet) { super(tApplet); } public void draw(Graphics g) { g.setColor(tA.getColor()); g.setFont(new Font("Monospaced", Font.PLAIN, 12)); g.drawString(tA.getText(), 20, 20); } } public class TextApplet extends java.applet.Applet { protected Text text; protected String textVal; protected Color color; public String getText() { return textVal; } public Color getColor() { return color; } public void init() { textVal = getParameter("text"); String textStyle = getParameter("style"); String textColor = getParameter("color"); if (textStyle == "code") text = new CodeText(this); else text = new PlainText(this); if (textColor == "red") color = Color.RED; else if (textColor == "blue") color = Color.BLUE; else color = Color.BLACK; } public void paint(Graphics g) { text.draw(g); 10 } } The Text class is more complicated than it should be (there is too much coupling between the Text and TextApplet classes). By getting rid of the reference to a TextApplet object in the Text class and setting the colour in the paint() method, one could turn the Text class into an interface and simplify the strategy classes considerably. 5.1 Rewrite the Text and PlainText classes to do what is described above. (6) 5.2 Explain the consequent changes that are necessary to the TextApplet class. (4) 5.3 Write an additional strategy class called FancyText (to go with your simplified strategy classes) to allow fancy text to be displayed for the value "fancy" provided for the style parameter. It should use the font Font ("Serif", Font.ITALIC, 12). (3) 5.4 Explain what changes are necessary to the TextApplet class for this. (2)
What is a parameter example?
What is a boolean output?
What are the advantages of defining packages in java?
What are the different types of methodologies?
What happens when I use / and % with a negative numerator?
What is keyword auto for?
What does nullpointerexception mean?
Can you run java program without main method?
What is a hashmap used for?
Can I overload to string method
What is increment in java?
