Det størrelse() metoden til Listegrænseflade i Java bruges til at få antallet af elementer i denne liste. Det vil sige, at list size()-metoden returnerer antallet af elementer, der er til stede i denne listebeholder.
streng metoder java
Syntaks:
public int size()>
Parametre : Denne metode tager ingen parametre.
Returværdi: Denne metode returnerer antal elementer i denne liste.
Illustration: Antag, at det er en heltalsliste
Input : {3,2,1,5,7} Output : 5> Eksempel 1:
Java
// Java program to Illustrate size() method> // of List class for Integer value> // Importing required classes> import> java.util.*;> // Main class> public> class> GFG {> >// Main driver method> >public> static> void> main(String[] arg)> >{> >// Creating object of ArrayList class> >List list =>new> ArrayList();> >// Populating List by adding integer elements> >// using add() method> >list.add(>1>);> >list.add(>2>);> >list.add(>3>);> >list.add(>4>);> >list.add(>5>);> >// Printing elements of List> >System.out.println(>'Before operation: '> + list);> >// Getting total size of list> >// using size() method> >int> size = list.size();> >// Printing the size of List> >System.out.println(>'Size of list = '> + size);> >}> }> |
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>Produktion
Before operation: [1, 2, 3, 4, 5] Size of list = 5>
Eksempel 2:
Java
// Java program to Illustrate size() method> // of List class for Integer value> // Importing required classes> import> java.util.*;> // Main class> public> class> GFG {> >// Main driver method> >public> static> void> main(String[] args)> >{> >// Creating an empty string list by> >// declaring elements of string type> >List list =>new> ArrayList();> >// Populating List by adding string elements> >// using add() method> >list.add(>'Geeks'>);> >list.add(>'for'>);> >list.add(>'Geeks'>);> >// Printing the List> >System.out.println(>'Before operation: '> + list);> >// Getting total size of list> >// using size() method> >int> size = list.size();> >// Printing the size of list> >System.out.println(>'Size of list = '> + size);> >}> }> |
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>Produktion
Before operation: [Geeks, for, Geeks] Size of list = 3>