list.add trong java

public interface List extends Collection

public interface List extends Collection { boolean isEmpty(); boolean contains(Object o); Object[] toArray(); T[] toArray(T[] a); boolean containsAll(Collection c); boolean addAll(Collection c); boolean addAll(int index, Collection c); boolean removeAll(Collection c); boolean retainAll(Collection c); int size(); boolean equals(Object o); int hashCode(); E get(int index); E set(int index, E element); boolean add(E e); void add(int index, E element); E remove(int index); boolean remove(Object o); void clear(); int indexOf(Object o); int lastIndexOf(Object o); Iterator iterator(); ListIterator listIterator(); ListIterator listIterator(int index); List subList(int fromIndex, int toIndex); default Spliterator spliterator() default void replaceAll(UnaryOperator operator) default void sort(Comparator c) static List of() static List of(E e1) static List of(E e1, E e2) static List of(E e1, E e2, E e3) static List of(E e1, E e2, E e3, E e4) static List of(E e1, E e2, E e3, E e4, E e5) static List of(E e1, E e2, E e3, E e4, E e5, E e6) static List of(E e1, E e2, E e3, E e4, E e5, E e6, E e7) static List of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8) static List of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9) static List of(E e1, E e2, E e3, E e4, E e5, E e6, E e7, E e8, E e9, E e10) static List of(E... elements) static List copyOf(Collection coll) }

package org.o7planning.list.ex; import java.util.ArrayList; import java.util.List; public class ListEx1 { public static void main(String[] args) { // Create a List List list = new ArrayList(); list.add("One"); list.add("Three"); list.add("Four"); // Insert an element at index 1 list.add(1, "Two"); for(String s: list) { System.out.println(s); } System.out.println(" ----- "); // Remove an element at index 2 list.remove(2); for(String s: list) { System.out.println(s); } } }

package org.o7planning.list.ex; public class Book { private String title; private float price; public Book(String title, float price) { this.title = title; this.price = price; } public String getTitle() { return title; } public float getPrice() { return price; } }

package org.o7planning.list.ex; import java.util.ArrayList; import java.util.List; public class ListEx2 { public static void main(String[] args) { Book b1 = new Book("Python Tutorial", 100f); Book b2 = new Book("HTML Tutorial", 120f); // Create an Unmodifiable List List bookList1 = List.of(b1, b2); // Create a List of Books using ArrayList List bookList = new ArrayList(); bookList.add(new Book("Java Tutorial", 300f)); bookList.add(new Book("C# Tutorial", 200f)); // Append all elements to the end of list. bookList.addAll(bookList1); for(Book book: bookList) { System.out.println(book.getTitle() + " / " + book.getPrice()); } } }

package org.o7planning.list.ex; import java.util.Arrays; import java.util.List; public class ListEx3 { public static void main(String[] args) { Book b1 = new Book("Python Tutorial", 100f); Book b2 = new Book("HTML Tutorial", 120f); Book b3 = new Book("Java Tutorial", 300f); Book[] bookArray = new Book[] {b1, b2, b3}; // Create a Fixed-size List. List bookList = Arrays.asList(bookArray); for(Book b: bookList) { System.out.println("Book: " + b.getTitle()); } } }

ListIterator listIterator(); ListIterator listIterator(int index);

package org.o7planning.list.ex; import java.util.ArrayList; import java.util.List; import java.util.ListIterator; public class List_listIterator { public static void main(String[] args) { // Create a List List list = new ArrayList(); list.add("One"); list.add("Two"); list.add("Three"); list.add("Four"); // Get a ListIterator. ListIterator listIterator = list.listIterator(); String first = listIterator.next(); System.out.println("First:" + first);// -->"One" String second = listIterator.next(); System.out.println("Second:" + second);// -->"Two" if (listIterator.hasPrevious()) { System.out.println("Jump back..."); String value = listIterator.previous(); System.out.println("Value:" + value);// -->"Two" } System.out.println(" ----- "); while (listIterator.hasNext()) { String value = listIterator.next(); System.out.println("Value:" + value); } } }

package org.o7planning.list.ex; import java.util.ArrayList; import java.util.List; public class List_stream { public static void main(String[] args) { Book b1 = new Book("Python Tutorial", 100f); Book b2 = new Book("HTML Tutorial", 120f); // Create an Unmodifiable List List bookList1 = List.of(b1, b2); // Create a List of Books using ArrayList List bookList = new ArrayList(); bookList.add(new Book("Java Tutorial", 300f)); bookList.add(new Book("C# Tutorial", 200f)); // Append all elements to the end of list. bookList.addAll(bookList1); // Using Stream bookList.stream() // .filter(b -> b.getPrice() > 100) // Filter Books with price > 100 .forEach(b -> System.out.println(b.getTitle() +" / " + b.getPrice())); } }

List subList(int fromIndex, int toIndex);

package org.o7planning.list.ex; import java.util.ArrayList; import java.util.List; public class List_subList { public static void main(String[] args) { // Create a List List originList = new ArrayList(); originList.add("A"); // 0 originList.add("B"); // 1 originList.add("C"); // 2 originList.add("D"); // 3 originList.add("E"); // 4 List subList = originList.subList(1, 3); // fromIndex .. toIndex System.out.println("Elements in subList: "); for(String s: subList) { System.out.println(s); // B C } subList.clear(); // Remove all elements from subList. System.out.println("Elements in original List after removing all elements from subList: "); for(String s: originList) { System.out.println(s); // B C } } }

default Spliterator spliterator() // Java 8

Object[] toArray(); T[] toArray(T[] a); // Java 11, The default method, inherited from Collection. default T[] toArray​(IntFunction generator)

package org.o7planning.list.ex; import java.util.ArrayList; import java.util.List; public class List_toArray { public static void main(String[] args) { List list = new ArrayList(); list.add("A"); // 0 list.add("B"); // 1 list.add("C"); // 2 list.add("D"); // 3 list.add("E"); // 4 String[] array = new String[list.size()]; list.toArray(array); for(String s: array) { System.out.println(s); } } }

default void sort(Comparator c)

package org.o7planning.list.ex; import java.util.ArrayList; import java.util.List; public class List_sort_ex1 { public static void main(String[] args) { Book b1 = new Book("Python Tutorial", 100f); Book b2 = new Book("HTML Tutorial", 120f); Book b3 = new Book("Java Tutorial", 300f); Book b4 = new Book("Javafx Tutorial", 100f); Book b5 = new Book("CSS Tutorial", 300f); List bookList = new ArrayList(); bookList.add(b1); bookList.add(b2); bookList.add(b3); bookList.add(b4); bookList.add(b5); // Sort by ascending price. // And Sort by ascending title. bookList.sort((book1, book2) -> { float a = book1.getPrice() - book2.getPrice(); if(a > 0) { return 1; } else if(a < 0) { return -1; } int b = book1.getTitle().compareTo(book2.getTitle()); return b; }); for(Book b: bookList) { System.out.println(b.getPrice() +" : " + b.getTitle()); } } }

default void replaceAll(UnaryOperator operator)

package org.o7planning.list.ex; import java.util.ArrayList; import java.util.List; public class List_replaceAll { public static void main(String[] args) { Book b1 = new Book("Python Tutorial", 100f); Book b2 = new Book("HTML Tutorial", 120f); Book b3 = new Book("Java Tutorial", 300f); Book b4 = new Book("Javafx Tutorial", 100f); Book b5 = new Book("CSS Tutorial", 300f); List bookList = new ArrayList(); bookList.add(b1); bookList.add(b2); bookList.add(b3); bookList.add(b4); bookList.add(b5); // Replace Book with new Book with the price increased by 50%. bookList.replaceAll(b -> new Book(b.getTitle(), b.getPrice() * 150f/100)); for(Book b: bookList) { System.out.println(b.getPrice() + " : " + b.getTitle()); } } }