Using VectorEnumerator Class

[japuentem]

I found this example on a web page

Enumeration enum=v.elements ();
while(enum.hasM oreElements())
{
String elemento=(Strin g)enum.nextElem ent();
if(elemento.equ als("tres"))
{
System.out.prin tln("Encontrado tres");
break;
}
}

but when i paste into my code and execute it throws this exeption

java.lang.Class CastException: java.util.Vecto r
at Layout2.documen tLines(Layout2. java:282)
at Layout2.obtiene Cadena(Layout2. java:200)
at Layout2.generaD ocumento(Layout 2.java:78)
at LanzaLayout.mai n(LanzaLayout.j ava:241)
Exception in thread "main"

Please help

[r035198x]

I found this example on a web page

Enumeration enum=v.elements ();
while(enum.hasM oreElements())
{
String elemento=(Strin g)enum.nextElem ent();
if(elemento.equ als("tres"))
{
System.out.prin tln("Encontrado tres");
break;
}
}

but when i paste into my code and execute it throws this exeption

java.lang.Class CastException: java.util.Vecto r
at Layout2.documen tLines(Layout2. java:282)
at Layout2.obtiene Cadena(Layout2. java:200)
at Layout2.generaD ocumento(Layout 2.java:78)
at LanzaLayout.mai n(LanzaLayout.j ava:241)
Exception in thread "main"

Please help

What type of elements do you have in the vector?

[japuentem]

What type of elements do you have in the vector?

I have vectors inside the main vector

[r035198x]

I have vectors inside the main vector

Well then doesn't

[CODE=java] String elemento=(Strin g)enum.nextElem ent();[/CODE]
look suspicious to you?

[japuentem]

Well then doesn't

[CODE=java] String elemento=(Strin g)enum.nextElem ent();[/CODE]
look suspicious to you?

i think it's trying to convert object to string, that is what i see, may be i'm wrong

[r035198x]

i think it's trying to convert object to string, that is what i see, may be i'm wrong

That's what it's trying to do. But you said the Objects in the Vector are actually Vectors. So a class cast exception will occur because you cannot cast a Vector to a String.

[japuentem]

That's what it's trying to do. But you said the Objects in the Vector are actually Vectors. So a class cast exception will occur because you cannot cast a Vector to a String.

So, i need to cast the object to vector then get each value of the inside vectors and that value cast to string?

[r035198x]

So, i need to cast the object to vector then get each value of the inside vectors and that value cast to string?

Yes, depending on what you want the program to do of course.

[japuentem]

Yes, depending on what you want the program to do of course.

Thanks for your help

[JosAH]

Thanks for your help

Aren't you using Java 1.5 or later? Those versions have generics and you don't
have to cast anything then. This is a vector of vectors of String e.g.

[code=java]
Vector<Vector<S tring>> vvs= new Vector<Vector<S tring>>();
...
// get i,j-th element:
String element= vvs.get(i).get( j);
[/code]

kind regards,

Jos

[japuentem]

Aren't you using Java 1.5 or later? Those versions have generics and you don't
have to cast anything then. This is a vector of vectors of String e.g.

[code=java]
Vector<Vector<S tring>> vvs= new Vector<Vector<S tring>>();
...
// get i,j-th element:
String element= vvs.get(i).get( j);
[/code]

kind regards,

Jos

How can i know what version of java i'm using?

[r035198x]

How can i know what version of java i'm using?

Open a command prompt/shell and type

java -showversion

[JosAH]

Open a command prompt/shell and type

java -showversion

Make that:

java -version

kind regards,

Jos ;-)

[r035198x]

Make that:

java -version

kind regards,

Jos ;-)

That's definitely cleaner.
See why you should always be around?

[r035198x]

That's definitely cleaner.
See why you should always be around?

Is there a cleaner one for the javac as well? I'd think the JDK version might be more important to know than the JRE in (some cases).