Upload files to "OOP/Java/Lab/Week12"

OOP/Java/Lab/Week12/GenStack.java

@@ -0,0 +1,82 @@
+// Generic Stack class
+class Stack<T> {
+
+    private Object[] elements;
+    private int top;
+    private static final int DEFAULT_SIZE = 10;
+
+    public Stack() {
+        elements = new Object[DEFAULT_SIZE];
+        top = -1;
+    }
+
+    public void push(T item) {
+        elements[++top] = item;
+    }
+
+    public T pop() {
+        if (isEmpty()) return null;
+        return (T) elements[top--];
+    }
+
+    public boolean isEmpty() {
+        return top == -1;
+    }
+}
+
+// Student class
+class Student {
+
+    private String name;
+    private int id;
+
+    public Student(String name, int id) {
+        this.name = name;
+        this.id = id;
+    }
+
+    public String toString() {
+        return "Student [name=" + name + ", id=" + id + "]";
+    }
+}
+
+// Employee class
+class Employee {
+
+    private String name;
+    private String department;
+
+    public Employee(String name, String department) {
+        this.name = name;
+        this.department = department;
+    }
+
+    public String toString() {
+        return "Employee [name=" + name + ", department=" + department + "]";
+    }
+}
+
+public class Main {
+
+    public static void main(String[] args) {
+        // Stack of Students
+        Stack<Student> studentStack = new Stack<>();
+        studentStack.push(new Student("John", 101));
+        studentStack.push(new Student("Mary", 102));
+
+        System.out.println("Students popped from stack:");
+        while (!studentStack.isEmpty()) {
+            System.out.println(studentStack.pop());
+        }
+
+        // Stack of Employees
+        Stack<Employee> employeeStack = new Stack<>();
+        employeeStack.push(new Employee("Bob", "IT"));
+        employeeStack.push(new Employee("Alice", "HR"));
+
+        System.out.println("\nEmployees popped from stack:");
+        while (!employeeStack.isEmpty()) {
+            System.out.println(employeeStack.pop());
+        }
+    }
+}