Jak používat seznam java
Příklady kódu
seznam v Javě
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.ListIterator;
public class Main {
public static void main(String[] args) {
List<String> list = new ArrayList<String>();
list.add("a");
list.add("b");
list.add("c");
list.add("d");
list.add("e");
list.add("f");
//On met la liste dans le désordre
Collections.shuffle(list);
System.out.println(list);
//On la remet dans l'ordre
Collections.sort(list);
System.out.println(list);
Collections.rotate(list, -1);
System.out.println(list);
//On récupère une sous-liste
List<String> sub = list.subList(2, 5);
System.out.println(sub);
Collections.reverse(sub);
System.out.println(sub);
//On récupère un ListIterator
ListIterator<String> it = list.listIterator();
while(it.hasNext()){
String str = it.next();
if(str.equals("d"))
it.set("z");
}
while(it.hasPrevious())
System.out.print(it.previous());
}
}
java připojit do seznamu
package com.journaldev.examples;
import java.util.ArrayList;
import java.util.List;
public class ListAddExamples {
public static void main(String[] args) {
List<String> vowels = new ArrayList<>();
vowels.add("A"); // [A]
vowels.add("E"); // [A, E]
vowels.add("U"); // [A, E, U]
System.out.println(vowels); // [A, E, U]
vowels.add(2, "I"); // [A, E, I, U]
vowels.add(3, "O"); // [A, E, I, O, U]
System.out.println(vowels); // [A, E, I, O, U]
}
}jak vytvořit seznam java
//Creating arraylist example
ArrayList<String> list = new ArrayList<String>();
//Adding objects in arraylist
list.add("Mango");
list.add("Banana");
//Change the element (index,"new value")
list.set(1,"Dates");
//Return the 2nd element, because index starts from 0
System.out.println("Returning element: " + list.get(1)); Související stránky
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