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The formatter spec says of the 's' general conversion: If the '#' flag is given and the argument is not a Formattable, then a FormatFlagsConversionMismatchException will be thrown. but the implementation fails to do that: ==========$ cat -n T.java 1 import java.util.*; 2 class T { 3 public static void main(String[] args) { 4 System.out.printf("%#s%n", 0); 5 } 6 } ==========$ /usr/j2sdk1.5.0/bin/javac T.java ==========$ /usr/j2sdk1.5.0/bin/java T 0 ==========$
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