diff --git a/Exercise_1.java b/Exercise_1.java
index 314a3cb45..8b99272bd 100644
--- a/Exercise_1.java
+++ b/Exercise_1.java
@@ -7,29 +7,52 @@ class Stack {
   
     boolean isEmpty() 
     { 
-        //Write your code here 
+        //Write your code here
+        return (top < 0);
     } 
 
     Stack() 
     { 
-        //Initialize your constructor 
+        //Initialize your constructor
+        top = -1;
     } 
   
     boolean push(int x) 
     { 
         //Check for stack Overflow
         //Write your code here
+        if (top >= (MAX - 1)) {
+            System.out.println("Stack Overflow");
+            return false;
+        } else {
+            a[++top] = x;
+            System.out.println(x + " pushed into stack");
+            return true;
+        }
     } 
   
     int pop() 
     { 
         //If empty return 0 and print " Stack Underflow"
         //Write your code here
+        if (top < 0) {
+            System.out.println("Stack Underflow");
+            return 0;
+        } else {
+            int x = a[top--];
+            return x;
+        }
     } 
   
     int peek() 
     { 
         //Write your code here
+        if (top < 0) {
+            System.out.println("Stack is Empty");
+            return 0;
+        } else {
+            return a[top];
+        }
     } 
 }