diff --git a/Classes/BowlingProgram.java b/Classes/BowlingProgram.java
new file mode 100644
index 0000000..c36d5e4
--- /dev/null
+++ b/Classes/BowlingProgram.java
@@ -0,0 +1,34 @@
+import java.util.*; 
+import java.util.Iterator;
+
+public class Bowling {
+    HashMap<String, Integer> players;
+    Bowling() {
+        players = new HashMap<String, Integer>();
+    }
+    public void addPlayer(String name, int p) {
+        players.put(name, p);
+    }
+    //your code goes here
+    public void getWinner() {
+        System.out.println(players.entrySet()
+        .stream().max((entry1, entry2) -> entry1.getValue() > entry2.getValue() ? 1 : -1).get().getKey());
+    }
+    
+}
+
+public class Program {
+    public static void main(String[ ] args) {
+        Bowling game = new Bowling();
+        Scanner sc = new Scanner(System.in);
+
+        for(int i=0;i<3;i++) {
+            String input = sc.nextLine();
+            String[] values = input.split(" ");
+            String name = values[0];
+            int points = Integer.parseInt(values[1]);
+            game.addPlayer(name, points);
+        }
+        game.getWinner();
+    }
+}
diff --git a/ORACLE/JavaExplorerCertificateQuestion/Department.java b/ORACLE/JavaExplorerCertificateQuestion/Department.java
new file mode 100644
index 0000000..ae03d80
--- /dev/null
+++ b/ORACLE/JavaExplorerCertificateQuestion/Department.java
@@ -0,0 +1,69 @@
+public class Department extends Employee {
+
+	private static int counter = 0;
+
+	private String departmentName;
+
+	public Department(String departmentName) {
+
+		this.departmentName = departmentName;
+
+	}
+
+	private Employee[] department = new Employee[10];
+
+	public void addEmp(Employee newEmployee) {
+		if (counter >= 0 && counter < 10) {
+			department[counter] = newEmployee;
+			counter++;
+			// System.out.println(counter);
+		} else {
+			System.out.println("Department is full!");
+		}
+	}
+
+	public int getNumberOfEmployees() {
+		return counter;
+	}
+
+	public Employee[] getEmployees() {
+		// if(counter == 10)
+		return department;
+
+	}
+
+	public Employee getEmpWithId(int id) {
+		for (Employee emp : department) {
+			if (emp != null) {
+				if (emp.getID() == id) {
+					return emp;
+				}
+			}
+		}
+		return null;
+	}
+
+	public double totalSalary() {
+		double totalSalary = 0.0;
+
+		for (Employee emp : department) {
+
+			totalSalary += (emp != null) ? emp.getSalary() : 0.0;
+		}
+
+		return totalSalary;
+	}
+
+	public double averageSalary() {
+
+		return totalSalary() / counter;
+
+	}
+
+	@Override
+	public String toString() {
+		// TODO Auto-generated method stub
+		return "Department: " + departmentName;
+	}
+
+}
diff --git a/ORACLE/JavaExplorerCertificateQuestion/Employee.java b/ORACLE/JavaExplorerCertificateQuestion/Employee.java
new file mode 100644
index 0000000..68b0556
--- /dev/null
+++ b/ORACLE/JavaExplorerCertificateQuestion/Employee.java
@@ -0,0 +1,48 @@
+public class Employee {
+
+	private int iD;
+	private String name;
+	private double salary;
+
+	public Employee() {
+
+	}
+
+	public Employee(int iD, String name, double salary) {
+//		super();
+		this.iD = iD;
+		this.name = name;
+		this.salary = salary;
+	}
+
+	public int getID() {
+		return iD;
+	}
+
+	public void setID(int iD) {
+		this.iD = iD;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public double getSalary() {
+		return salary;
+	}
+
+	public void setSalary(double salary) {
+		this.salary = salary;
+	}
+
+	@Override
+	public String toString() {
+		// TODO Auto-generated method stub
+		return "Employee: " + iD + " " + name + " " + salary;
+	}
+
+}
diff --git a/ORACLE/JavaExplorerCertificateQuestion/HRApp.java b/ORACLE/JavaExplorerCertificateQuestion/HRApp.java
new file mode 100644
index 0000000..380df7a
--- /dev/null
+++ b/ORACLE/JavaExplorerCertificateQuestion/HRApp.java
@@ -0,0 +1,49 @@
+public class HRApp {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+
+		System.out.println("HR App Starts");
+
+		Employee emp1 = new Employee(1, "Ann", 1500);
+		Employee emp2 = new Employee(2, "Jane", 2000);
+		Employee emp3 = new Employee(3, "Dirk", 2200);
+		Employee emp4 = new Employee(4, "Glies", 1800);
+		Employee emp5 = new Employee(5, "Brien", 2500);
+		Employee emp6 = new Employee(6, "Alex", 4000);
+		Employee emp7 = new Employee(7, "Lieve", 6000);
+		Employee emp8 = new Employee(8, "Dankun", 2000);
+		Employee emp9 = new Employee(9, "Sylla", 2200);
+		Employee emp10 = new Employee(10, "Jessica", 1800);
+		Employee emp11 = new Employee(11, "Yale", 2220);
+
+		Department dp1 = new Department("Department Education");
+		dp1.addEmp(emp1);
+		dp1.addEmp(emp2);
+		dp1.addEmp(emp3);
+		dp1.addEmp(emp4);
+		dp1.addEmp(emp5);
+		dp1.addEmp(emp6);
+		dp1.addEmp(emp7);
+		dp1.addEmp(emp8);
+		dp1.addEmp(emp9);
+		dp1.addEmp(emp10);
+		dp1.addEmp(emp11);
+
+		System.out.println(dp1);
+		for (Employee emp : dp1.getEmployees()) {
+			if (emp != null)
+				System.out.println(emp);
+		}
+
+		System.out.println("Total Salary: " + dp1.totalSalary());
+
+		System.out.println("Average Salary: " + dp1.averageSalary());
+
+		System.out.println(dp1.getNumberOfEmployees());
+
+		System.out.println(dp1.getEmpWithId(118));
+
+	}
+
+}