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25 
26 package java.util;
27 
28 /**
29  * Unchecked exception thrown when duplicate flags are provided in the format
30  * specifier.
31  *
32  * <p> Unless otherwise specified, passing a {@code null} argument to any
33  * method or constructor in this class will cause a {@link
34  * NullPointerException} to be thrown.
35  *
36  * @since 1.5
37  */
38 public class DuplicateFormatFlagsException extends IllegalFormatException {
39 
40     @java.io.Serial
41     private static final long serialVersionUID = 18890531L;
42 
43     private String flags;
44 
45     /**
46      * Constructs an instance of this class with the specified flags.
47      *
48      * @param  f
49      *         The set of format flags which contain a duplicate flag.
50      */
DuplicateFormatFlagsException(String f)51     public DuplicateFormatFlagsException(String f) {
52         if (f == null)
53             throw new NullPointerException();
54         this.flags = f;
55     }
56 
57     /**
58      * Returns the set of flags which contains a duplicate flag.
59      *
60      * @return  The flags
61      */
getFlags()62     public String getFlags() {
63         return flags;
64     }
65 
getMessage()66     public String getMessage() {
67         return String.format("Flags = '%s'", flags);
68     }
69 }
70