Value Types - Actual And Formal Parameters

Jun 3, 2014

public static void main(String[] args) {
System.out.println("VALUE Types");
int i = 5;
int j = 11;
System.out.println("i = " + i + ", j = " + j);

[Code] ....

Questions based on the code:

1. Identify all of the actual parameters in the code provided.
(Is it just i, j iArray and jArray)???

2. Identify all of the formal parameters in the code provided.

3. What is displayed in the third println statement?
i = 11, j = 2001

4. What is displayed in the fifth println statement?
iArray = 6 7 2001 9 10, jArray = 6 7 2001 9 10

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Formal And Actual Parameters?

Jan 11, 2014

In the following Java Code:

public static void f() {
int n = 5;
p(n, 2 * n);
}
public static void p(int a, int b) {
int x = 1;
q(x, a + b);
}
public static void q(int x, int y) {
int z = x + y;
x = 0;
...
} mh_sh_highlight_all('java');

When we write x = 0; that refers to the formal parameter int x and hence it's the formal parameter that changes value. why isn't the value of the actual parameter also changing?

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Apr 30, 2014

I have a question about query execution strategy ...

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I need to execute this query changing parameters' actual values in a combinatorial way, until a combination gives back at least one row or all combinations are unsuccessfully tried. For instance, I may have this sequence of values:

(V1,V2,V3);
(V1,V2,"");
(V1,"",V3);
(V1,"","");

where V1, V2, V3 may by string values and V1 is always present, not null, and not blank in each combination.

A first strategy may be to prepare the statement, clear the parameters each time I execute the query, until stop condition is met.

I wonder if may be more efficient transform the query into

SELECT F1, F2, F3 FROM MYTABLE WHERE F1 = V1

and cycling over the cursor and, for each cursor row, verify if the returned tuple (F1,F2,F3) matches the combination (V1x,V2x,V3x). When at least 1 rows matches, or all combination are done, I'll exit iteration.

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Jan 31, 2014

I wrote a Chess game that uses socket to connect to another computer, and allow player vs player and player vs computer game sessions.

However, there is a problem which I noticed.

When you get the IP address of the computer in which the program is running, you are not getting the computer's actual IP, you are getting the Router's IP.

Is there a way to get around this.

So the problem is that when I go to another computer, located in a different house or lets say from my school, the program cannot connect back to my home IP, because it uses the router's ip, not the computer's ip I am running the server program.

Is there a way to get the Computer's IP, not the router's ip when summoning or invoking the get IP address method from the socket class?

When I say that the socket class is acquiring the router's ip, well that's done without my interfering...I don't know why it does that, it is somehow recognizing the router and not the computer.

The thing is that the server program is written that any client program is able to connect to the home server.

But when I run the program from a different location other than the current home, the sockets don't connect because it is somehow recognizing the router's ip not the computer's ip.

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May 7, 2014

I have an applet that uses JPanels to draw images in. I want to include actual jpgs now instead. The applet points to a .jar file. I want to use any number of images here, do I have to include them all in the jar file or is there another way to "point" to them (like html)?

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Jan 12, 2014

Below is part Two the method I need creating:

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public static String updateSecretWord(String secretWord, String englishWord, String guessedChar)
{
}

Below is the example of how it should look like when I call it

updateSecretWord(“*****”, “Hello”, “h”) = h****
updateSecretWord(“h****”, “Hello”, “o”) = h***o
updateSecretWord(“he**o”, “Hello”, “e”) = he**o

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Inheritance Relationship Between Type Of Actual Object And Object Reference?

Apr 15, 2014

For example I create an object like this:

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The question I have is why do I have to cast 'b' to SavingsAccount? Isn't the actual object reference of 'b' already an instance of 'SavingsAccount' class? How does the 'BankAccount' affect the object itself? I'm really confused as to what class is truly getting instantiated and how BankAccount and SavingsAccount are both functioning to make the object 'b'.

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Aug 25, 2014

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Overloading With Primitive Types?

Jan 22, 2015

Why the following is happening.

For the below code, when I execute it, it prints

Short method 10 //result 1
Sub class short method 10 //result 2

Which is as expected but if I comment out line 3, then it prints

Integer method 10 //result 3
Integer method 10 //result 4

I can understand result 3 is because of an upcast from short to int, since FunWithOverloading will not have a overloaded method with short now. However, what is happening with result 4? Shouldn't it call methodA of the subclass with the argument type short? If its because I have declared the reference variable, derived, of the type FunWithOverloading, then how come the first result correctly picks the overloaded method of the sub class?

class FunWithOverloading{
void methodA(int x){System.out.println("Integer method " + x);}
void methodA(short x){System.out.println("Short method " + x);} //line 3
} class OverloadedSubClass extends FunWithOverloading{
void methodA(short x){System.out.println("Sub class short method " + x);}

[Code] ....

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Initializing Arrays Of Various Types

Sep 18, 2014

For basic arrays, we can directly combine declaration and initialization as E.g: int[] num= new int[2]

But can we do this do for forming class object arrays? like

class stu
{
.....
}
stu[] s=new stu[2]
????

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How To Create And Re-use Object Types

Mar 17, 2014

how objects relate to classes and how you can create and re-use object types.on that point, but this has me baffled. I most certainly do not have a firm grasp yet on passing things to and from methods that just makes my head hurt. SO anyway I tried out one of the code examples:

/* ElectricGuitar.java */
class ElectricGuitar {
String brand;
int numOfPickups;
boolean rockStarUsesIt;

[code]...

But I just realized this thing has no main method and only one class defined.....so I guess I just tried to compile.

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May 6, 2014

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class potatoes {
public static void main(String[] args){
Scanner user = new Scanner(System.in);
String fname;
fname = user.nextLine;
String newfname = fname.substring(0, 3);
System.out.println(newfname);
}
}

This bit of code isnt working, it has something to do with incompatible types for fname

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Apr 1, 2014

I am trying to understand the concept of Generics in java. In the introduction to Generic Types, this example is given:

Java Code: public class Box {
private Object object;
public void set(Object object) { this.object = object; }
public Object get() { return object; }
} mh_sh_highlight_all('java'); "Since

Since its methods accept or return an Object, you are free to pass in whatever you want, provided that it is not one of the primitive types." - I understand this.But then it has been changed to a generic class:

Java Code: /**
* Generic version of the Box class.
* @param <T> the type of the value being boxed
*/
public class Box<T> {
// T stands for "Type"
private T t;

public void set(T t) { this.t = t; }
public T get() { return t; }
} mh_sh_highlight_all('java'); "

As you can see, all occurrences of Object are replaced by T. A type variable can be any non-primitive type you specify: any class type, any interface type, any array type, or even another type variable."We can use any type in place of an Object, because Object is a superclass of all classes. But T (or any other class) is not a superclass of all classes. So how do we justify any class being used in place of a random T or any other class?

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Feb 23, 2015

I've got a question to ask.

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System.out.println("Wrapper");
}
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System.out.println("Primitive");
}
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The output is "Wrapper". What would be the reason behind it?

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Mar 14, 2014

GoodEmployee is defined who has ALL the following properties:

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Write a method:

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childNames the array of the names of the children of the employee

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Aug 2, 2014

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package line;
import java.awt.Point;
public class Line {
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[code]...

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Jan 31, 2015

public class TestClass {
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[Code] ....

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Mar 1, 2015

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[Code] ....

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Jul 29, 2014

package input;

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if(user <= 18) {
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} else {
JOptionPane.showMessageDialog(null, "User is not legit");
}
}
}

I'm getting this error message :

incompatible types: void cannot be converted to int

unclosed string literal

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Feb 13, 2015

This code works

public class RedShapeDecorator extends ShapeDecorator {

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protected Shape decoratedShape;
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this. decoratedShape=decoratedShape;

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[code]....

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Mar 17, 2014

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