Pinki Roy

public class GlobalLogic { public static void main(String... args){ String str1="AB3"; String str2="AB"+ str1.length(); if(str1==str2){ System.out.println("True"); }else { System.out.println("False"); } } }


I do not understand why this is giving the output of False. Please explain.

Hi,
I have to get started with WebCenter and Oracle ADF, please advice how I can make myself ready for it.
Please advise about any good link for beginners for both Oracle ADF and WebCenter.

Also please let me know if I should study Oracle ADF first or Webcenter first.

Its Apache Web Server.

How does Apache recognize whether the request is coming from Java or php application?

Actually the client does not want the user to know what action classes are being hit so for the whole application he wants that the user should only seehttp://sus4112:90/CmdApp and not a url with the changing action classes eg http://sus4112:90/CmdApp/preferenceAction.action that are being hit as he moves around the application.

I hope I have made my requirement clear now.

Its just the client requirement, that we need to implement.

I would like to participate as well.

I have to change the URL from full URL to one without the action name.

For Example

http://sus4112:90/CmdApp/prefrencesAction.action

to

http://sus4112:90/CmdApp

Could someone guide me how this could be achieved please?

Hi All,

I want to know why any class is made Immutable?
What are the points considered before making a class Immutable?

Also why is the String class made Immutble?


Regards,

Pinki

class Mammal{ void eat(Mammal m){ System.out.println("Mammal eats food"); } } class Cattle extends Mammal{ void eat(Cattle c){ System.out.println("Cattle eats hay"); } } class Horse extends Cattle{ void eat(Horse h){ System.out.println("Horse eats hay"); } } public class Test{ public static void main(String[] args){ Mammal h = new Horse(); Cattle c = new Horse(); c.eat(h); } }

I don't understand why Mammal eats food is being displayed.

Hi All,


class StringEquals { public static void main(String[] args) { Boolean b = new Boolean(true); String str = new String(""+b); StringBuffer sb = new StringBuffer(str); System.out.println(b.equals(str)+"," +str.equals(sb)+","+sb.equals(b)); } }

In the above code I fail to understand why str.equals(sb) is displaying false.

class Mammal{ void feedMilk()throws Exception {throw new Exception();} } class Bat extends Mammal { void feedMilk(){ System.out.println("Bat"); } } class MyMain{ public static void main(String[] args){ Mammal mammal = new Bat(); mammal.feedMilk(); } }

I don't understand why mammal.feedMilk();
is throwing a unhandled Exception: java.lang.Exception

It is legal to have an overridden method with no exception, so why is it throwing this exception.
In this case the subclass version of feedMilk s being called.

Swastik , thanks a lot for the clarification .

class TesterA { public static void main(String[] args) { Integer sum1 = 125; //line 1 int sum2 = 125; //line 2 System.out.print(sum1.equals(sum2)); //line 3 System.out.print(sum2.equals(sum1)); //line 4 System.out.print(sum1==sum2); //line 5 } }

Why does line 4 give me compile time error where as line 3 does not give me any error.

Hi All,

The following program produces 0.0 and 9.0 as output.

I don't understand why 0.0 is displayed.

class MySuper { MySuper(){disp();} void disp(){System.out.println("superclass");} } class MySub extends MySuper { double i=Math.ceil(8.4f); public static void main(String arg[]) { MySuper obj= new MySub(); obj.disp(); } void disp(){System.out.println(i);} }