stack

java/stack.java

@@ -0,0 +1,88 @@
+
+class Stack {
+
+  // store elements of stack
+  private int arr[];
+  // represent top of stack
+  private int top;
+  // total capacity of the stack
+  private int capacity;
+
+  // Creating a stack
+  Stack(int size) {
+    // initialize the array
+    // initialize the stack variables
+    arr = new int[size];
+    capacity = size;
+    top = -1;
+  }
+
+  // push elements to the top of stack
+  public void push(int x) {
+    if (isFull()) {
+      System.out.println("Stack OverFlow");
+
+      // terminates the program
+      System.exit(1);
+    }
+
+    // insert element on top of stack
+    System.out.println("Inserting " + x);
+    arr[++top] = x;
+  }
+
+  // pop elements from top of stack
+  public int pop() {
+
+    // if stack is empty
+    // no element to pop
+    if (isEmpty()) {
+      System.out.println("STACK EMPTY");
+      // terminates the program
+      System.exit(1);
+    }
+
+    // pop element from top of stack
+    return arr[top--];
+  }
+
+  // return size of the stack
+  public int getSize() {
+    return top + 1;
+  }
+
+  // check if the stack is empty
+  public Boolean isEmpty() {
+    return top == -1;
+  }
+
+  // check if the stack is full
+  public Boolean isFull() {
+    return top == capacity - 1;
+  }
+
+  // display elements of stack
+  public void printStack() {
+    for (int i = 0; i <= top; i++) {
+      System.out.print(arr[i] + ", ");
+    }
+  }
+
+  public static void main(String[] args) {
+    Stack stack = new Stack(5);
+
+    stack.push(1);
+    stack.push(2);
+    stack.push(3);
+
+    System.out.print("Stack: ");
+    stack.printStack();
+
+    // remove element from stack
+    stack.pop();
+    System.out.println("\nAfter popping out");
+    stack.printStack();
+
+
+  }
+}