whys is catch giving error?

• Line 11 will throw a NullPointerException error if c == null but line 12 will only catch IOExceptions.

• The HashMap get method does not throw exceptions - it returns null if the key cannot be found.

1. import java.util.Map;
2. void setup(){
3.   Map<Integer,Map<Integer,Boolean>> a = new HashMap();
4.   Map<Integer,Boolean> b = new HashMap();
5.   b.put(1,false);
6.   a.put(5,b);
7.   Map<Integer,Boolean> c = a.get(5);
8. 
   
9.   try {
10.      boolean d =   c.get(2);
11.   } catch (Exception e) {  // catch ALL exceptions thrown since try
    
12.       e.printStackTrace();
13.       boolean d =   c.get(1);  
14.   }
15. }

Note that an exception thrown in the catch section is not detected with the same try