Interface A {
String test();
}
Interface B {
int test();
}
Create a class AB which must implements both A & B
interfaces.
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Answer / chandra
we can not do with same method name. i tried it in jdk1.5,
not able to compile.
| Is This Answer Correct ? | 15 Yes | 2 No |
Answer / nitin
Sandeep,
Interface B gets the compilation error saying, "The return
type is incompatible with A.test()"
Hence, the proposed solution is not correct.
| Is This Answer Correct ? | 13 Yes | 2 No |
Answer / kssrk ramesh
forget about implementing the interface
First of all can we can not have two similar method names
only with return type as different.As per overloaded method
concept it is not acceptable.So inorder to implement the
interfaces we need to do like that which is not acceptable
as per overloaded methods principle and hence compilation
error.
| Is This Answer Correct ? | 7 Yes | 2 No |
Answer / ganesh
yes , we cant implement like this.same as above answer.I
tested it .
| Is This Answer Correct ? | 4 Yes | 3 No |
Answer / nitin
Ramesh,
I am agree with the technical boudries which you have
talked about. But this is a real problem and have to cope
with it.
We can not change the interfaces at all, but there should
be a way to achieve the goal, may be using inner class or
so.
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / chandan kumar
Chandan
test in A clashes with test in B;attempting to use
incompatible type
| Is This Answer Correct ? | 0 Yes | 1 No |
Answer / sumit
interface A {
String test();
}
interface B {
int test();
}
class AB implements A
{
public String test()
{ System.out.println("Test1 in AB");
return "a";
}
}
class Test
{
public static void main(String as[])
{
AB i = new AB();
B b = new B(){
public int test()
{
System.out.println("Test");
return 1;
}
};
i.test();
b.test();
}
}
| Is This Answer Correct ? | 3 Yes | 5 No |
Answer / dhoom
interface A
{
String test();
}
interface B
{
int test();
}
interface AB implements A extends B
{
....
}
| Is This Answer Correct ? | 0 Yes | 2 No |
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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)
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