1    package utils; 
2     
3    public class Assert { 
4     
5      static public void notFalse(boolean b) 
6          throws IllegalArgumentException { 
7     
8        if (b == false) 
9          throw new IllegalArgumentException( 
10             "boolean expression false"); 
11    
12     } 
13    
14     static public void notNull(Object obj) 
15    
16         throws IllegalArgumentException { 
17    
18       if (obj == null) 
19    
20         throw new IllegalArgumentException("null argument"); 
21    
22     } 
23    
24    
25     static public void notFalse(boolean b, String s) 
26    
27         throws IllegalArgumentException { 
28    
29       if (b == false) 
30    
31         throw new IllegalArgumentException(s); 
32    
33     } 
34    
35     static public void notNull(Object obj, String s) 
36    
37         throws IllegalArgumentException { 
38    
39       if (obj == null) 
40    
41         throw new IllegalArgumentException(s); 
42    
43     } 
44    
45   } 
46    
47