1).what is the difference between below examples
String s="vijay";
String s=new String("vijay");
- 12 Answers
- 16092 Views
- Mascon, Satyam, TCS, I also Faced
- E-Mail Answers
Answer Posted / ravi
Guys please don't miss guide.
Karun you r absolutely right, but there is one big
difference between them
String s="vijay"; --> This is string literal
String s=new String("vijay"); --> String Object
Definitely first one gives the better performance than
second one, why because..
JVM maintains an internal list of references for interned
Strings( POOL of unique strings) to avoid duplicate string
objects in heap memory. when ever the JVM loads string
literals from class file and executes, it checks whether
that string exists in the internal list or not. If it is
already exists in the list then it does not create new
string and it uses the references to the existing String
object. JVM does this type by checking tinternally for
string literal but not for string object which it creates
through 'new' keyword
You can explicitly force the JVM todo this type of checking
for string objects which are created through 'new' keyword
using "String.intern()" method. This forces the JVM to check
the internal list and use the existing String object if it
is already present.
| Is This Answer Correct ? | 26 Yes | 0 No |
Post New Answer View All Answers
What are different ways of object creation in java ?
Can a boolean be null java?
Why is java logo a cup of coffee?
What was java originally called?
If I only change the return type, does the method become overloaded?
How to access arraylist elements in java?
What is the static import?
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)
Can java inner class be static?
What is Hierarchy of exception?
What is identifier in java?
What does this () mean in constructor chaining concept?
What is boolean used for?
What is a double?
Why do we use bufferedreader?
