Im having trouble with using mutliple parts to an if/else statement.

This is a pearson myprogramming lab exercise. Not exactly what the error message is referring to. I tried flipping the choice = B and choice = T sections and what occurred was the error message just then said that there was an issue with the choice = B else missing if.

CTest.java:17: error: 'else' without 'if'
                else if(choice = T)
                ^

1 import java.util.Scanner;
2 
3 class CTest {
4       public static void main(String [] args) {
5               Scanner stdin = new Scanner(System.in);
6               
7               int age = 0;
8               String choice = null;
9               
10 System.out.print("Enter your menu selection: ");
11              choice = stdin.nextString();
12              if(choice = S);
13              {
14                      if(age <= 21)
15                      System.out.println("Vegetable Juice");
16                      else System.out.println("Cabernet");    
17              }
18              else if(choice = T)
19              {
20                      if(age <= 21)        
21                      System.out.println("Cranberry Juice");
22                      else System.out.println("Chardonnay");  
23              }
24              else if(choice = B)
25              {
26                      if(age <= 21)                
27                      System.out.println("soda");
28                      else System.out.println("IPA"); 
29              }
30              else
31              {
32                      System.out.println("invalid menu selection");   
33              }
34 
35              
36      }
37 }