Java-Programs/ArrayLists.java at master · pooja2405/Java-Programs · GitHub

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import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

import java.util.ListIterator;

public class ArrayLists {

public static final Integer[] i = new Integer[] { 10, 20, 30 }; // [0,20,30]

public static final Integer[] j = new Integer[] { 60, 70 }; // [60,70]

public static final Integer[] k = new Integer[] { 80, 90 }; // [80,90]

public static void main(String[] args) {

// Create/Initialize List (default)

List<Integer> ls_default = new ArrayList<Integer>(); // []

// Create/Initialize List with initial capacity 10

List<Integer> ls_initial_size = new ArrayList<Integer>(10); // [ , , , , , , , , , ]

// Create/Initialize List with existing Collection

List<Integer> ls_collection = new ArrayList<>(Arrays.asList(i)); // [0,20,30]

//-----Add Values-------------//

ls_collection.add(50); // [0,20,30,50]

ls_collection.add(3, 40); // [0,20,30,40,50]

ls_collection.addAll(Arrays.asList(k)); // [0,20,30,40,50,80,90]

ls_collection.addAll(5, Arrays.asList(j)); // [0,20,30,40,50,60,70,80,90]

//-----Size--------//

ls_collection.size(); // 9

ls_collection.isEmpty(); // false

//-----Find elements----//

ls_collection.indexOf(30); // 2

ls_collection.lastIndexOf(50); // 4

ls_collection.contains(90); // true

ls_collection.containsAll(Arrays.asList(i)); // true

//-----Get and set elements-----//

ls_collection.get(4); // 30

ls_collection.set(0, 10); // [10,20,30,40,50,60,70,80,90]

ls_collection.subList(0, 3); // [10, 20, 30]

//-----Loop over each List item----//

System.out.println(ls_collection.toString()); // [10, 20, 30, 40, 50, 60, 70, 80, 90]

ls_collection.forEach((val) -> System.out.print(val + " ")); // 10 20 30 40 50 60 70 80 90

System.out.println();

for (Integer val : ls_collection) {

System.out.print(val + " ");

} // 10 20 30 40 50 60 70 80 90

System.out.println();

ListIterator<Integer> it = ls_collection.listIterator();

while (it.hasNext()) {

System.out.print(it.next() + " ");

} // 10 20 30 40 50 60 70 80 90

System.out.println();

//-----Remove elements----//

ls_collection.remove(0); // [20,30,40,50,60,70,80,90]

ls_collection.remove(ls_collection.size() - 1); // [20,30,40,50,60,70,80]

ls_collection.remove(ls_collection.indexOf(20)); // [30,40,50,60,70,80]

ls_collection.removeAll(Arrays.asList(j)); // [30,40,50,80]

ls_collection.clear(); // []

//----Sort---//

ls_default.add(60);

ls_default.add(20);

ls_default.add(80);

ls_default.add(10);

Collections.sort(ls_default); // [10, 20, 60, 80]

Collections.sort(ls_default, Collections.reverseOrder()); // [80, 60, 20, 10]

Collections.sort(ls_default, new Comparator<Integer>() {

@Override

public int compare(Integer a, Integer b) {

return a.compareTo(b);

}

}); // [10, 20, 60, 80]

}

Java-Programs/ArrayLists.java at master · pooja2405/Java-Programs · GitHub

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