If-else not working

<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %>
<html>
<head>
<title>Untitled Document</title>
</head>
<%
        Class.forName("com.mysql.jdbc.Driver");
        Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/mhs?user=root&password=admin");
        Statement stmt=conn.createStatement();
        ResultSet rs=null;

%>
<body>

<form method="post">
Select Your Choice:
<select name="Lab">
<option value="No"><--Select Lab/Non-Lab--></option>
<option value="Lab">Lab Base Students</option>
<option value="Non-Lab">Non-Lab Base Students</option>
</select>
<br></br>
<input type="submit" value=" To Show Student List Click here"><br></br>

</form>

<% String Lab=request.getParameter("Lab");
   String query=null;

   if (Lab == "Lab"){
       query="SELECT REGNO,SNAME FROM sub_comb WHERE L_category='Lab'";
       }
    else if (Lab == "Non-Lab")
      { 
       query="SELECT REGNO,SNAME FROM sub_comb WHERE L_category='Non-Lab'";

      }
   rs=stmt.executeQuery(query);
 %>
</body>
</html>

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