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Browse CoursesA company has installed a smart elevator system in its office building. The elevator operates based on the following rule. The elevator can move between 1st to 10th floor Users can enter their desired floor,but if the floor is outside the range,the system should print “Invalid floor” The elevator starts from 1st floor and moves […]
Find the common elements in 2 list(arraylist) import java.util.*; class ASC { public static void main(String args[]) { ArrayList<Integer> a=new ArrayList<>(); a.add(1); a.add(2); a.add(3);// 1 2 3 ArrayList<Integer> b=new ArrayList<>(); b.add(4); b.add(2); b.add(5);//4 2 5 a.retainAll(b);//retainall will keep only the common values System.out.println(a);}}
Remove duplicates from an array using hashset {1, 2, 2, 3, 4, 4, 5} import java.util.*; class ASC { public static void main(String args[]) { int arr[]={1, 2, 2, 3, 4, 4, 5}; HashSet<Integer> s=new HashSet<>(); for(int a:arr)//a=5 { s.add(a);//s=1 2 3 4 5 } System.out.println(s); } }
Add and display the elements(4 elements) using HashSet, check if an element exists there in a hashset,remove the element.. Find the smallest and largest element(number) using treeset class Display { public static void main(String args[]) { HashSet<String> a=new HashSet<String>(); a.add(“apple”); a.add(“mango”); a.add(“banana”); a.add(“apple”); //apple mango banana System.out.println(“mango is there..”+a.contains(“mango”)); a.remove(“mango”); […]
import java.util.*; class ASC { public static void main(String args[]) { HashSet<String> h=new HashSet<String>(); h.add(“Ram”); h.add(“Abi”); h.add(“Priya”); h.add(“John”); h.add(“Abi”); System.out.println(h); } }
Set: A set is a collection that does not allow duplicate elements part of java collection framework and inside util package used when you want to store the unique elements Main features: No duplicates,can be looped using iterator or for-each loop HashSet–>Fast,unordered,no dulicates LinkedHashSet–>Maintains the insertion order TreeSet–Ascending order by default(sorted set)
class ASC { public static void main(String args[]) { ArrayList<Integer> find=new ArrayList<Integer>();1 8 9 2 6 6 Scanner s=new Scanner(System.in); for(int i=0;i<5;i++) { int temp=s.nextInt();//temp=8 if(!find.contains(temp))//true find.add(temp);//[1 8 9 2 6] } Collections.sort(find);[1 2 6 8 9] System.out.println(find); }}
Question: Create an Arraylist by adding elements Apple,banana,mango First element:Apple Second element:banana Third element:mango sort the list reverse the list ——————————- import java.util.*; class ASC { public static void main(String args[]) { ArrayList<String> fruits=new ArrayList<String>(); fruits.add(“Apple”); fruits.add(“Banana”); fruits.add(“Mango”); System.out.println(“First element:”+fruits.get(0)); System.out.println(“second element:”+fruits.get(1)); System.out.println(“Third element:”+fruits.get(2)); Collections.sort(fruits); System.out.println(“Sorted list:”+fruits); Collections.reverse(fruits); […]
Arrays in java import java.util.*; class ASC { public static void main(String args[]) { ArrayList<String> slist=new ArrayList<String>(); slist.add(“honey”);//0 slist.add(“joes”);//1 System.out.println(slist.indexOf(“joes”)); ArrayList<String> slist2=new ArrayList<String>(); slist2.addAll(slist); System.out.println(slist); System.out.println(slist2); }}
Collection framework: A Java collection framework provides an architecture to store and manipulate a group of elements or objects –>It “Provides an architecture” – means it gives a well-structured set of classes and interfaces. –>”To store, retrieve, and manipulate” – covers the basic operations like adding, removing, searching, sorting, etc. –>”Group […]
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