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25 
26 package java.util;
27 
28 /**
29  * Unchecked exception thrown when the argument corresponding to the format
30  * specifier is of an incompatible type.
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 IllegalFormatConversionException extends IllegalFormatException {
39 
40     @java.io.Serial
41     private static final long serialVersionUID = 17000126L;
42 
43     private char c;
44     private Class<?> arg;
45 
46     /**
47      * Constructs an instance of this class with the mismatched conversion and
48      * the corresponding argument class.
49      *
50      * @param  c
51      *         Inapplicable conversion
52      *
53      * @param  arg
54      *         Class of the mismatched argument
55      */
IllegalFormatConversionException(char c, Class<?> arg)56     public IllegalFormatConversionException(char c, Class<?> arg) {
57         if (arg == null)
58             throw new NullPointerException();
59         this.c = c;
60         this.arg = arg;
61     }
62 
63     /**
64      * Returns the inapplicable conversion.
65      *
66      * @return  The inapplicable conversion
67      */
getConversion()68     public char getConversion() {
69         return c;
70     }
71 
72     /**
73      * Returns the class of the mismatched argument.
74      *
75      * @return   The class of the mismatched argument
76      */
getArgumentClass()77     public Class<?> getArgumentClass() {
78         return arg;
79     }
80 
81     // javadoc inherited from Throwable.java
getMessage()82     public String getMessage() {
83         return String.format("%c != %s", c, arg.getName());
84     }
85 }
86