Answer / ravinder

When a class implements a marker interface, then the object
of that class is given with a special behavior. For example
if a class implements remote interface(available in
java.rmi.* package) object of that class acts as a Remote
Object. For this reason java provides Marker Interface.

Answer / srinu

when class implements marker interface our class object
getting special behavoiur.
EX:-
suppose our class implements java.lang.Serializible
interface our class object getting special behaviour(our
class object converting java support format object to
network support)

Another Example our class implements java.rmi.Remote
interface our class object acts as Remote object.

Answer / siva kumar g

Marker interfaces can create an environment.

Marker interfaces are used to specify that a class belongs
to a logical family or grouping - as quoted above,
Cloneable is used to indicate that a particular class can
be cloned, or Serializable is used to indicate that a
particular class can be serialized.

Answer / maurya

an interface without any method is known as marker
interface. we use marker interface to actually mark for JVM
to distinguish that the class is belongs or subclass of ant
particular super class.
EX-->
we have an interface named serializable. there is a
condition that if you want to serialize your object u must
have to implements marker interface.
by doing this we just only inform JVM that my class is able
to be serialized. JVM detact it at run time by using Class
class methods.

String and stringbuffer both represent string objects. Can we compare string and stringbuffer in java?

0 Answers  

---

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)

0 Answers   TCS,

---

What is object in java?

0 Answers  

---

How to use Media tracker Class.

0 Answers  

---

What is string [] java?

0 Answers  

---

---

How does the java compiler work?

0 Answers  

---

what is difference between validation.xml & validation rules.xml?

8 Answers   BirlaSoft,

---

What is java virtual machine and how it is considered in context of java’s platform independent feature?

0 Answers  

---

Is a class an object?

0 Answers  

---

who can we create the object of a class? in how many ways we can create it (max 5)

2 Answers  

---

What is data type in computer?

0 Answers  

---

What is the multilevel inheritance. and also give the Example of it ?

5 Answers  

---