1 /*
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11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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13  * accompanied this code).
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23 
24 /**
25  * @test
26  * @bug 5030064
27  * @summary Basic tests for close().
28  */
29 
30 import java.io.Closeable;
31 import java.util.Formatter;
32 import java.util.FormatterClosedException;
33 
34 public class Close {
35 
36     private static class ExpectedException extends RuntimeException {}
37 
38     private static class C implements Appendable, Closeable {
append(CharSequence csq)39         public Appendable append(CharSequence csq) { return null; }
append(char c)40         public Appendable append(char c) { return null; }
append(CharSequence csq, int s, int e)41         public Appendable append(CharSequence csq, int s, int e) {
42             return null;
43         }
44 
close()45         public void close() {
46             throw new ExpectedException();
47         }
48     }
49 
50     private static class NC implements Appendable {
append(CharSequence csq)51         public Appendable append(CharSequence csq) { return null; }
append(char c)52         public Appendable append(char c) { return null; }
append(CharSequence csq, int s, int e)53         public Appendable append(CharSequence csq, int s, int e) {
54             return null;
55         }
56 
57         // method coincidentally called close()
close()58         public void close() {
59             throw new RuntimeException("NC.close should not be called");
60         }
61     }
62 
test(Formatter f)63     private static void test(Formatter f) {
64         if (f.out() instanceof C) {
65             // C.close() called since C implements Closeable
66             try {
67                 f.close();
68                 throw new RuntimeException("C.close not called");
69             } catch (ExpectedException x) {
70                 System.out.println("  C.close called");
71             }
72         } else {
73             // NC.close() not called since NC does not implement Closeable
74             f.close();
75         }
76 
77         // Formatter is a Closeable
78         if (!(f instanceof Closeable))
79             throw new RuntimeException("Formatter is not a Closeable");
80 
81         // multiple close() does not throw a FormatterClosedException
82         f.close();
83         try {
84             f.close();
85             System.out.println("  FormatterClosedException not thrown");
86         } catch (FormatterClosedException x) {
87             throw new RuntimeException("FormatterClosedException thrown");
88         }
89     }
90 
main(String [] args)91     public static void main(String [] args) {
92         System.out.println("testing Closeable");
93         test(new Formatter(new C()));
94         System.out.println("testing non-Closeable");
95         test(new Formatter(new NC()));
96     }
97 }
98