import java.util.ArrayList; import java.util.List; public class Demo { public static void main(String args[]) throws Exception { List<Integer>list = new ArrayList<Integer>(); list.add(100); list.add(200); list.add(200); list.add(200); list.add(300); list.add(400); list.add(400); list.add(500); List <Integer>list2 = new ArrayList<Integer>(); list2.add(100); list2.add(200); list2.add(300); list2.add(400); list.retainAll(list2); System.out.println("Resultant list = "+list); } }
import java.util.ArrayList; import java.util.List; public class Demo { public static void main(String args[]) throws Exception { List<Integer>list = new ArrayList<Integer>(); list.add(100); list.add(200); list.add(200); list.add(200); list.add(300); list.add(400); list.add(400); list.add(500); List <Integer>list2 = new ArrayList<Integer>(); list2.add(100); list2.add(200); list2.add(300); list2.add(400); list.removeAll(list2); System.out.println("Resultant list = "+list); } }
import java.util.ArrayList; import java.util.Vector; public class Demo { public static void main(String[] args) { ArrayList<String>arr = new ArrayList<String>(); arr.add("50"); arr.add("100"); arr.add("150"); arr.add("200"); arr.add("250"); arr.add("300"); Vector<String>vector = new Vector<String>(); vector.add("500"); vector.add("700"); vector.add("800"); vector.add("1000"); // gets added at index 3 arr.addAll(3, vector); System.out.println("Result after append..."); for (String str: arr) System.out.println(str); } }
import java.util.ArrayList; import java.util.ListIterator; public class Demo { public static void main(String[] args) { ArrayList<Integer>arrList = new ArrayList<Integer>(); arrList.add(100); arrList.add(200); arrList.add(300); arrList.add(400); arrList.add(500); arrList.add(600); arrList.add(700); arrList.add(800); arrList.add(900); arrList.add(1000); System.out.println("ArrayList..."); for (Integer i: arrList) System.out.println(i); ListIterator<Integer>iterator = arrList.listIterator(); System.out.println("Previous Index =" + iterator.previousIndex()); System.out.println("Next Index = " + iterator.nextIndex()); iterator.next(); System.out.println("Previous Index = " + iterator.previousIndex()); System.out.println("Next Index =" + iterator.nextIndex()); iterator.next(); iterator.next(); System.out.println("Previous Index = " + iterator.previousIndex()); System.out.println("Next Index = " + iterator.nextIndex()); } }
import java.util.ArrayList; import java.util.List; public class Demo { public static void main(String[] args) { ArrayList<String>arrayList = new ArrayList<String>(); arrayList.add("100"); arrayList.add("200"); arrayList.add("300"); arrayList.add("400"); arrayList.add("500"); arrayList.add("600"); arrayList.add("700"); arrayList.add("800"); arrayList.add("900"); arrayList.add("1000"); System.out.println("ArrayList..."); for (String s: arrayList) System.out.println(s); List<String>list = arrayList.subList(4, 8); System.out.println("SubList of ArrayList..."); for (int i = 0; i<list.size(); i++) System.out.println(list.get(i)); } }
import java.time.Duration; public class Demo { public static void main(String[] args) { Duration duration = Duration.ofDays(25); System.out.println("Hours in 25 days = "+duration.toHours()); } }
import java.util.Arrays; import java.util.Iterator; import java.util.List; public class Demo { public static void main(String[] a) { List<String>list = Arrays.asList(new String[] { "P", "Q", "R", "S", "T", "U", "V", "W" }); Iterator<String>i = list.iterator(); System.out.println("Displaying elements..."); while (i.hasNext()) { System.out.println(i.next()); } } }
import java.util.HashSet; import java.util.PriorityQueue; public class Demo { public static void main(String[] args) { HashSet<Integer>set = new HashSet<>(); set.add(100); set.add(150); set.add(250); set.add(300); set.add(250); set.add(500); set.add(600); set.add(500); set.add(900); PriorityQueue<Integer>queue = new PriorityQueue<>(set); System.out.println("Elements with no duplicates = "+queue); } }
import java.util.ArrayList; import java.util.Collections; import java.util.List; public class Demo { public static void main(String args[]) throws Exception { List<String>list = new ArrayList<String>(); list.add("A"); list.add("B"); list.add("C"); list = Collections.unmodifiableList(list); // An exception is thrown since its a read-only list now list.add("D"); list.add("E"); list.add("F"); System.out.println(list); } }
import java.util.ArrayList; import java.util.Arrays; import java.util.List; import java.util.function.Function; import java.util.stream.Collectors; public class Demo { public static void main(String args[]) { List<Employee>emp = Arrays.asList(new Employee("Jack", 29, "South"), new Employee("Tom", 24, "North"), new Employee("Harry", 35, "West"),new Employee("Katie", 32, "East")); List<String>res = emp.stream().map(u ->u.displayEmpName()).collect(Collectors.toList()); System.out.println("Employee Names = "+res); } } class Employee { private String emp_name; private int emp_age; private String emp_zone; public Employee(String emp_name, int emp_age, String emp_zone) { this.emp_name = emp_name; this.emp_age = emp_age; this.emp_zone = emp_zone; } public String displayEmpName() { return this.emp_name; } }
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