Why only one Class is public in one file? Explain in
details. Thanks in Advance.
Answer Posted / malay
I think that you call only public classes from outside.Now
all these classe are kept in a .java file.So there should
be a one to one mapping between a public class
& .java/.class file.If there are more than one public
classes then JVM has to maintain a tracker that what all
classes are in single .java/.class file.Presently its easy
for JVM coz when a class is called it simply goes & load
the .class file with that name.
Is This Answer Correct ? | 1 Yes | 1 No |
Post New Answer View All Answers
What is null data type?
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)
How do you check if a string is lexicographically in java?
Write code to implement bubble sort in java?
If a variable is declared as private, where may the variable be accessed?
What the difference is between execute, execute Query, execute Update?
Why map is used in java?
List down the methods and interfaces of collection class in java.
What is instance example?
Can a abstract class be defined without any abstract methods?
What are the differences between heap and stack memory?
What is java util collection?
How to sort a collection of custom Objects in Java?
Can vector have duplicates in java?
How does arraylist size increase in java?