Create Implement stack using array

Implement stack using array

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+//Implement stack using array
+
+import java.util.*;
+import java.io.*;
+import java.lang.*;
+
+class GfG {
+	public static void main(String args[])throws IOException {
+         BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
+         int t = Integer.parseInt(read.readLine());
+
+		     while(t>0) {
+    			MyStack obj = new MyStack();
+		    	int Q = Integer.parseInt(read.readLine());
+    			int k = 0;
+		    	String str[] = read.readLine().trim().split(" ");
+
+          while(Q>0) {
+    				int QueryType = 0;
+		    		QueryType = Integer.parseInt(str[k++]);
+
+            if(QueryType == 1) {
+    					int a = Integer.parseInt(str[k++]);
+    					obj.push(a);
+    				}
+            else if(QueryType == 2) {
+      				System.out.print(obj.pop()+" ");
+			    	}
+
+            Q--;
+			    }
+			    System.out.println("");
+
+          t--;
+		 }
+	}
+}
+
+class MyStack {
+    int top;
+	  int arr[] = new int[1000];
+
+    MyStack() {
+		top = -1;
+	}
+    void push(int a) {
+	    if(top == arr.length - 1) {
+	        System.out.println("Overflow");
+	    }
+
+	    else {
+	        arr[++top] = a;
+	    }
+	} 
+
+	int pop() {
+        if(top == -1) {
+            return -1;
+        }
+
+        return arr[top--];
+	}
+}