In Java, the Stack interface represents a Last-In-First-Out (LIFO) data structure. It extends the Vector class with respective methods that allow a vector to be treated as a stack.
- Â Push:
      void push(E item): Adds an item onto the top of the stack.
   2. Pop:
     E pop(): Removes the object at the top of the stack and returns it.
   3. Peek:
        E peek(): Returns the object at the top of the stack without removing it.
   4. Empty:
        boolean empty(): Checks if the stack is empty.
   5. Search:
     int search(Object o): Searches for the specified object and returns its position relative to the top of the stack
                      (1-based index). Returns -1 if the object is not found.
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import java.util.EmptyStackException;
import java.util.Stack;
public class StudentStackExample {
public static void main(String[] args) {
// Creating a stack to store student names
Stack<String> studentStack = new Stack<>();
// Pushing students onto the stack
studentStack.push("Paani");
studentStack.push("Mahesh");
studentStack.push("Datta");
studentStack.push("Ganesh");
studentStack.push("Harsha");
// Displaying the stack of students
System.out.println("Stack of students:");
System.out.println(studentStack);
// Peeking at the top student
try {
String topStudent = studentStack.peek();
System.out.println("\nTop student (peek): " + topStudent);
} catch (EmptyStackException e) {
System.out.println("\nStack is empty. No top student to peek.");
}
// Popping a student from the stack
try {
String poppedStudent = studentStack.pop();
System.out.println("\nPopped student: " + poppedStudent);
} catch (EmptyStackException e) {
System.out.println("\nStack is empty. Cannot pop a student.");
}
// Displaying the updated stack
System.out.println("\nStack after popping:");
System.out.println(studentStack);
// Checking if the stack is empty
System.out.println("\nIs stack empty? " + studentStack.isEmpty());
}
}
D:\>javac StudentStackExample.java
D:\>java StudentStackExample
Stack of students:
[Paani, Mahesh, Datta, Ganesh, Harsha]
Top student (peek): Harsha
Popped student: Harsha
Stack after popping:
[Paani, Mahesh, Datta, Ganesh]
Is stack empty? falseCode language: CSS (css)