updated the other questions

praticejava/Demo.java

@@ -1,27 +1,16 @@
-class RunLoop1 extends Thread{
-    @Override
-    public void run(){
-        for (int i = 0; i <= 5; i++) {
-            System.out.println(i);
-        }
-    }
-}
 
-class RunLoop2 extends Thread{
-    @Override
-    public void run(){
-        for (int i = 10; i < 15; i++) {
-            System.out.println(i);
-        }
-    }
-}
+public class Demo {
+
+    public static void main(String[] args) {
+        int l, b, ar, per;
+
+        l = 25;
+        b = 30;
+        ar = l * b;
 
+        per = 2 * (l + b);
 
-public class Demo{
-    public static  void main(String[] args) {
-    RunLoop1 st1 = new RunLoop1();
-    RunLoop2 st2 = new RunLoop2();
-    st1.start();
-    st2.start();
+        System.out.println("Area of rectange: " + ar);
+        System.out.println("Perimeter of rectange: " + per);
     }
 }

praticejava/PracticeArrays.java

@@ -1,14 +1,18 @@
 
+import java.util.Vector;
+
+
+
+
 public class PracticeArrays {
 
     public static void main(String[] args) {
-        try {
-            int num = 2/0;
-            System.out.println(num);
-        } catch (ArithmeticException e) {
-            System.out.println("Something went wrong: " + e.getMessage());
-        }finally{
-            System.out.println("Using exception here");
-        }
+      Vector<Integer> vec = new Vector<>();
+      vec.add(2);
+      vec.add(2);
+      vec.add(2);
+      System.out.println(vec);
+      vec.set(2,1);
+      System.out.println(vec);
     }
 }

praticejava/Rect.java

@@ -0,0 +1,16 @@
+
+
+
+public class Rect {
+
+    public static void main(String[] args) {
+        int l, b, ar, per;
+        l = Integer.parseInt("20");
+        b = Integer.parseInt("30");
+
+        ar = l * b;
+        per = 2 * (l + b);
+        System.out.println("Area of rectange: " + ar);
+        System.out.println("Perimeter of rectange: " + per);
+    }
+}

praticejava/Test.java

@@ -0,0 +1,14 @@
+import java.util.Scanner;
+class Test {
+  public static void main(String[] args) {
+    Scanner sc = new Scanner(System.in);
+    System.out.print("Enter a number: ");
+    int num = sc.nextInt();
+    int reverse = 0;
+    while (num != 0) {
+      reverse = reverse * 10 + num % 10;
+      num /= 10;
+    }
+    System.out.println("The reversed number is: " + reverse);
+  }
+}

praticejava/index.jsp

@@ -0,0 +1,64 @@
+<h5 id="twentyninth">29. Design a login page using JSP and Servlet.</h5>
+        <div class="container">
+          <pre class="box">
+            <code class="java">
+              &lt;%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%&gt; 
+              &lt;%@ page import="java.util.Date, java.text.SimpleDateFormat" %&gt;
+
+              &lt;!DOCTYPE html&gt;
+              &lt;html&gt;
+                &lt;head&gt;
+                  &lt;meta charset="UTF-8" /&gt;
+                  &lt;title&gt;Login Page&lt;/title&gt;
+                  &lt;link rel="stylesheet" href="./css/style.css" type="text/css" /&gt;
+                &lt;/head&gt;
+                &lt;body&gt;
+                  &lt;div class="login-container"&gt;
+                    &lt;form action="#" method="POST" class="login-form"&gt;
+                      &lt;h1 class="title"&gt;Login&lt;/h1&gt;
+
+                      &lt;div class="input-group"&gt;
+                        &lt;label for="email"&gt;Email&lt;/label&gt;
+                        &lt;input
+                          type="email"
+                          id="email"
+                          name="email"
+                          placeholder="Enter your email"
+                          required
+                        /&gt;
+                      &lt;/div&gt;
+
+                      &lt;div class="input-group"&gt;
+                        &lt;label for="password"&gt;Password&lt;/label&gt;
+                        &lt;input
+                          type="password"
+                          id="password"
+                          name="password"
+                          placeholder="Enter your password"
+                          required
+                        /&gt;
+                      &lt;/div&gt;
+
+                      &lt;button type="submit" class="login-btn"&gt;Login&lt;/button&gt;
+
+                      &lt;p class="register-link"&gt;
+                        Don&#39;t have an account? &lt;a href="#"&gt;Register here&lt;/a&gt;
+                      &lt;/p&gt;
+                    &lt;/form&gt;
+                  &lt;/div&gt;
+                  &lt;div class="footer"&gt;
+                    &lt;hr /&gt;
+                    &lt;%-- Get current year --%&gt;
+                    &lt;%
+                      Date currentDate = new Date();
+                      SimpleDateFormat sdf = new SimpleDateFormat("yyyy");
+                      String currentYear = sdf.format(currentDate);
+                    %&gt;
+                    &lt;p&gt;© &lt;%= currentYear %&gt; All Rights Reserved.&lt;/p&gt;
+                  &lt;/div&gt;
+                &lt;/body&gt;
+              &lt;/html&gt;
+            </code>
+
+              </pre>
+          </div>

praticejava/test.css

@@ -0,0 +1,3 @@
+h1{
+    font-family: 'Gill Sans', 'Gill Sans MT', Calibri, 'Trebuchet MS', sans-serif;
+}