Collections framework alternatives

Author: cs-cse

.idea/modules.xml

@@ -0,0 +1,23 @@
+import java.util.ArrayList;
+
+public class arrayList {
+    public static void main(String[] args) {
+        ArrayList<String>students=new ArrayList<>();
+        students.add("Aman");
+        students.add("Boat");
+        students.add("Emcure");
+        students.add(1,"New Boat");
+        String c=students.get(2);
+        String d=students.set(2,"Hellewwss");
+        students.remove(2);
+        System.out.println(students.size());
+        System.out.println(c);
+        System.out.println(d);
+        System.out.println( students.contains("a"));
+        for(String a: students){
+            System.out.print(a+" ");
+        }
+        System.out.println();
+        System.out.println(students);
+    }
+}

dsa-Arrays-Strings/src/arrayList.java

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+import java.util.HashMap;
+import java.util.Map;
+
+public class hashMap {
+    public static void main(String[] args) {
+        Map<String,Integer>numbers=new HashMap<>();
+        numbers.put("One",1);
+        numbers.put("Two",2);
+        numbers.put("Three",3);
+        numbers.put("Four",4);
+        System.out.println(numbers);
+        System.out.println("Entries: ");
+        for (Map.Entry<String,Integer>e:numbers.entrySet()){
+            System.out.print(e+" ");
+        }
+        System.out.println();
+
+        System.out.println("Keys: ");
+        for (Map.Entry<String,Integer>e:numbers.entrySet()){
+            System.out.print(e.getKey()+" ");
+        }
+        System.out.println();
+        System.out.println("Values: ");
+        for (Map.Entry<String,Integer>e:numbers.entrySet()){
+            System.out.print(e.getValue()+" ");
+        }
+    }
+}

dsa-HashTable/dsa-HashTable.iml dsa-HashSet/map-set.imldsa-HashTable/dsa-HashTable.iml renamed to dsa-HashSet/map-set.iml

@@ -0,0 +1,43 @@
+import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.Set;
+import java.util.TreeSet;
+
+public class hashSet {
+    public static void main(String[] args) {
+
+        Set<Integer>set=new HashSet<>();
+        set.add(23);
+        set.add(1);
+        set.add(2);
+        set.add(5);
+        set.add(2);
+        set.remove(2);
+        System.out.println(set);
+        System.out.println( set.contains(1));
+        System.out.println(set.size());
+        System.out.println("*** *** *** *** *** *** *** *** *** ***");
+        Set<Integer>setl=new LinkedHashSet<>();
+        setl.add(23);
+        setl.add(1);
+        setl.add(2);
+        setl.add(5);
+        setl.add(2);
+        setl.remove(2);
+        System.out.println(setl);
+        System.out.println( setl.contains(1));
+        System.out.println(setl.size());
+        System.out.println("*** *** *** *** *** *** *** *** *** ***");
+        Set<Integer>setree=new TreeSet<>();
+        setree.add(23);
+        setree.add(1);
+        setree.add(2);
+        setree.add(5);
+        setree.add(2);
+        setree.remove(2);
+        System.out.println(setree);
+        System.out.println( setree.contains(1));
+        System.out.println(setree.size());
+
+    }
+}

dsa-HashTable/src/HashTable.java dsa-HashSet/src/HashTable.javadsa-HashTable/src/HashTable.java renamed to dsa-HashSet/src/HashTable.java

@@ -0,0 +1,16 @@
+import java.util.ArrayDeque;
+
+public class arrayDeque {
+//    pronounced as 'deck'
+public static void main(String[] args) {
+    ArrayDeque<Integer>adq=new ArrayDeque<>();
+    adq.offer(3);
+    adq.offerFirst(13);
+    adq.offerLast(23);
+    System.out.println(adq);
+
+    adq.pollFirst();
+    adq.pollLast();
+    System.out.println(adq);
+}
+}

dsa-HashSet/src/hashMap.java

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+import java.util.Comparator;
+import java.util.PriorityQueue;
+
+public class priorityQueue {
+
+    public static void main(String[] args) {
+        PriorityQueue<Integer>pq=new PriorityQueue<>(Comparator.reverseOrder());
+        pq.offer(1);
+        pq.offer(31);
+        pq.offer(22);
+        pq.offer(5);
+        System.out.println(pq);
+        System.out.println(pq.poll());
+        System.out.println(pq.peek());
+
+
+    }
+}