java 2 3
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Fichier Détails
| Cartes-fiches | 496 |
|---|---|
| Langue | Deutsch |
| Catégorie | Informatique |
| Niveau | Autres |
| Crée / Actualisé | 06.12.2020 / 24.01.2021 |
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When implementing compareTo, where do we have to pay attention to?
keeping compareTo and equals consistent
Can comparable or comparator be used without a import statement?
Comparator yes, comparable not
Whats the package name, whats the method name, whats the number of parameters, has the interface to be implemented by class compaing in class Comparable?
java.lang / compareTo() / 1 / Yes
Whats the package name, whats the method name, whats the number of parameters, has the interface to be implemented by class compaing in class Comparator?
java.util / compare() / 2 / no
Whats the static comparator-method for comparing by results of a function that returns any object?
comparing(function)
Whats the static comparator-method for comparing by the results of a function that returns a double?
comparingDouble(function)
Whats the static comparator-method for comparing by the results of a function that returns an int?
comparingInt(function)
Whats the static comparator-method for comparing by the results of a function that returns a long?
comparingLong(function)
Whats the static comparator-method for sorting using the order specified by the comparable implementation on the object itself?
naturalOrder()
Whats the static comparator-method for sorting using the reverse of the order specified by the Comparable implementation on the object itself?
reverseOrder()
Whats the default-method in comparator for reversing the order of the chained comparator?
reversed()
Whats the default-method in comparator if the previous comparator returns 0 se this comparator that returns a double/int/long , otherwise return the value form the previous comparator
thenComparingDouble(function) / thenComparingInt(function) / thenComparingLong(function)
When can we use Collections.sort()?
When the objects to be sorted are Comparable
What are the preconditions for Collections.binarySearch?
Must be sorted
What cant be done with genericTypes?
- calling a constructor
- creating an array of that generic type
- calling instanceof
- using a primitive type as a generic type parameter
- creating a static variable as a generic type parameter
What happns if you add list.removeIf on a list which was created by list.of()?
unsupportedOperation
