anoterCode

.idea/runConfigurations/Unnamed.xml

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+<component name="ProjectRunConfigurationManager">
+  <configuration default="false" name="Unnamed" type="Application" factoryName="Application" nameIsGenerated="true">
+    <option name="ALTERNATIVE_JRE_PATH" value="17" />
+    <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="true" />
+    <option name="MAIN_CLASS_NAME" value="Amazon" />
+    <module name="MvnDemo" />
+    <method v="2">
+      <option name="Make" enabled="true" />
+    </method>
+  </configuration>
+</component>

Amazon.java

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+import java.util.ArrayList;
+import java.util.Collections;
+
+public class Amazon {
+  public static void main(String[] args) {
+    int[] arr = { 4, 4, 4, 4, 1, 1, 1, 1, 1, 6, 6, 6, 6, 3, 3, 3, 3, 2, 2, 5, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7 };
+    ArrayList<Integer> al = new ArrayList<>();
+    ArrayList<Integer> all = new ArrayList<>();
+    for (int d = 0; d < arr.length; d++) {
+      Collections.sort(all);
+      all.add(arr[d]);
+    }
+    // for (int i = 0; i < arr.length; i++) {
+    // System.out.print(arr[i]);
+    // System.out.print("\t");
+    // al.add(arr[i]);
+    // }
+    // System.out.println("");
+    // System.out.println(al);
+    for (int i = 0; i < arr.length; i++) {
+      int p = 0;
+      if (!al.contains(arr[i])) {
+        al.add(arr[i]);
+        p++;
+        for (int j = 1 + i; j < arr.length; j++) {
+          if (arr[i] == arr[j]) {
+            p++;
+          }
+        }
+        System.out.println(arr[i] + " ==>" + p);
+      }
+    }
+    System.out.println(all);
+  }
+
+}

Collectionz.java

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+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+
+public class Collectionz {
+  public static void main(String[] args) {
+
+    // ArrayList
+
+    ArrayList<Integer> arr = new ArrayList<>();
+    arr.add(45);
+    arr.add(63);
+    arr.add(24);
+    arr.add(65);
+    arr.add(74);
+    arr.add(22);
+    arr.add(3, 100);
+
+    System.out.println(arr);
+    Collections.sort(arr);
+    System.out.println(arr);
+    System.out.println(arr.contains(43));
+
+    // Hashset
+    HashSet<String> hs = new HashSet<>();
+    hs.add("Sami");
+    hs.add("Leena");
+    hs.add("Zakaria");
+    hs.add("Mohammed");
+    hs.add("Sara");
+    hs.add("Chekalil");
+    hs.add("Benmoulay");
+    hs.add("doctor");
+    hs.add("Engineer");
+
+    System.out.println(hs);
+    Iterator<String> it = hs.iterator();
+    while (it.hasNext()) {
+      System.out.println(it.next());
+    }
+    System.out.println("");
+    System.out.println("");
+    System.out.println("");
+
+    // HashMap
+    //
+    HashMap<Integer, String> hm = new HashMap<>();
+    hm.put(0, "Zakaria");
+    hm.put(1, "Sara");
+    hm.put(2, "Leena");
+    hm.put(3, "Sami");
+    System.out.println(hm);
+    Set sm = hm.entrySet();
+    Iterator it2 = sm.iterator();
+    while (it2.hasNext()) {
+      System.out.println(it2.next());
+    }
+  }
+}

HashMapAmazon.java

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+import java.util.HashMap;
+
+public class HashMapAmazon {
+  public static void main(String[] args) {
+    int[] ar = { 3, 4, 4, 4, 3, 3, 3, 3, 6, 6, 6, 6, 1, 1, 1, 1, 9 };
+    HashMap<Integer, Integer> elementCount = new HashMap<>();
+    for (int i : ar) {
+      elementCount.put(i, elementCount.getOrDefault(i, 0) + 1);
+    }
+    for (Integer key : elementCount.keySet()) {
+      System.out.println("Element: " + key + " Count: " + elementCount.get(key));
+    }
+  }
+}

JavaClasses.java

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+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+public class JavaClasses {
+  public static void main(String[] args) {
+    Date date = new Date();
+    SimpleDateFormat s = new SimpleDateFormat("dd/M/yyyy");
+    SimpleDateFormat sd = new SimpleDateFormat("dd/M/yyyy hh:mm:ss");
+    System.out.println(s.format(date));
+    System.out.println(sd.format(date));
+    System.out.println(date.toString());
+  }
+}

SortedArray.java

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+import java.util.Arrays;
+
+public class SortedArray {
+  public static void main(String[] args) {
+    int[] ar = { 9, 5, 2, 4, 3, 1, 6, 8, 7 };
+    Arrays.sort(ar);
+    for (int i = 0; i < ar.length; i++) {
+
+      System.out.print(ar[i] + " ");
+    }
+  }
+}

src/main/java/Amazon.java

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+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Set;
+
+public class Amazon {
+  public static void main(String[] args) {
+    int x = 0;
+    int[] ar = { 3, 4, 4, 4, 3, 3, 3, 3, 6, 6, 6, 6, 1, 1, 1, 1, 9 };
+    ArrayList<Integer> al = new ArrayList<>();
+    for(int i : ar){
+      al.add(ar[i]);
+      if(!al.contains(ar[i])){
+        al.add(ar[i]);
+        ++x;
+        for(int j = i + 1; j < ar.length; j++){
+          if(ar[i] == ar[j]){
+            x++;
+          }
+        }
+        System.out.println(ar[i]);
+        System.out.println(x);
+      }
+    }
+  }
+}

src/main/java/Construct.java

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+public class Construct {
+  int year;
+  String model;
+  String make;
+
+  public Construct() {
+
+  }
+
+  public void carMake(String make, String model, int year) {
+    this.model = model;
+    this.make = make;
+    this.year = year;
+    System.out.println("My car by " + year + " is " + make + " - " + model);
+  }
+
+  public static void main(String[] args) {
+    Construct car = new Construct();
+    car.carMake("Audi", "RS6", 2025);
+  }
+}