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how to remove items of an arraylist
hey guys,
i got a little question about my code...
does the code removes the int of the arraylist? and gives it a true value out if it is removed?
public boolean kL(int ktonummer){ if (finKntoIdex(ktonummer) > 0) { konten.remove(ktonummer); return true; } else return false; } private int finKntoIdex(int ktonummer){ for(int i = 0;i<konten.size();i++){ if(konten.get(i).getKontonummer() == ktonummer){ return i; } } return -1; } private ArrayList<Konto> konten = new ArrayList<Konto>();
Last edited by Norm; December 16th, 2012 at 01:58 PM. Reason: changed quote to code tags
Related threads:
Re: how to remove items of an arraylist
Have you tried testing the kL() method to see what happens when it is executed?
Create a small test program with an arraylist, call the kL() method to have it remove an element and then print out the arraylist to see if the element has been removed.
If you don't understand my answer, don't ignore it, ask a question.
Re: how to remove items of an arraylist
yes thanks mate it worked !
a other question my toString method will not work...
@Override
public String toString(){
return String.format("Kontonummer: %s, Nachname: %s" , kten.kontonummer + konten.nachname);
}
private ArrayList<Konto> kten = new ArrayList<Konto>();
Re: how to remove items of an arraylist
Please explain.toString method will not work...
Post full text of any error messages.
If you don't understand my answer, don't ignore it, ask a question.
Re: how to remove items of an arraylist
kten.kontonummer and kten.nachname cannot be resolved or is not a field ...
but i have declared it in a other class
Re: how to remove items of an arraylist
Are you saying the compiler can not find those variables?
Some possible reasons:
Are they defined?
Did you spell the names correctly?
Are the definitions in scope where you are trying to use them?
Without seeing the source, I have no idea why.
BTW what you posted is not the full text of the compiler's error messages.
Here is a sample:
TestSorts.java:138: cannot find symbol symbol : variable var location: class TestSorts var = 2; ^
If you don't understand my answer, don't ignore it, ask a question.
Re: how to remove items of an arraylist
yes they are in the right scope but not on the same class
the first code is at the class bank.
there i work with the arraylist for example@Override
public String toString(){
return String.format("Kontonummer: %s, Nachname: %s" , kten.kontonummer + kten.nachname);
}
private ArrayList<Konto> kten = new ArrayList<Konto>();
but i have declared it in a other class called kten or prsonpublic boolean kontoLoeschen(int ktonummer){
if (findeKontoIndex(ktonummer) > 0) {
kten.remove(ktonummer);
return true;
}
else
return false;
or
private int findeKontoIndex(int ktonummer){
for(int i = 0;i<konten.size();i++){
if(kten.get(i).getKtonummer() == ktonummer){
return i;
}
}
return -1;
}
}
public String getNachname() {
return nachname;
}
Re: how to remove items of an arraylist
Please post the full text of the compiler's error messages.
If you don't understand my answer, don't ignore it, ask a question.
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