Answer Posted / sivadasan

Hi Here is the Example for Method Overloading:

class A{
  public void fun1(int x){
    System.out.println("The value of class A is : " + x);
  }
  public void fun1(int x,int y){
    System.out.println("The value of class B is : " + x + "
and " + y);
  }
}
public class polyone{
  public static void main(String[] args){
    A obj=new A();
// Here compiler decides that fun1(int)
is to be called and "int" will be printed.
    obj.fun1(2);   
// Here compiler decides that fun1(int,int)
is to be called and "int and int" will be printed. 
      obj.fun1(2,3);       
  }
}


And Method Overriding:

class A{
  public void fun1(int x){
     System.out.println("int in Class A is : "+ x);
  }
}

class B extends A{
  public void fun1(int x){
     System.out.println("int in Class B is : "+ x);
  }
}

public class polytwo{
  public static void main(String[] args){
     A obj;
     
     obj= new A(); // line 1
     obj.fun1(2);  // line 2 (prints "int in Class A is :
2")
     
     obj=new B();  // line 3
     obj.fun1(5);  // line 4 (prints ""int in Class B is :
5")


I think these are very very basic program example for
Method Overloading and Overriding...

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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