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The analyzer has detected a group of constants that looks like a set of bit flags: consecutive static final fields, variables, or enum fields initialized with integer values which are powers of two. One of the values in this group is repeated. It's likely a typo caused by adding a new flag or copying from the line next to it.
The example:
public class FilePermission {
public static final int READ = 0x01;
public static final int WRITE = 0x02;
public static final int EXECUTE = 0x04;
public static final int DELETE = 0x04; // <=
}The EXECUTE and DELETE constants share the same value. The (mask & DELETE) != 0 check evaluates to true when the mask contains only the execute permission, and clearing one flag also clears the other.
The fixed code:
public class FilePermission {
public static final int READ = 0x01;
public static final int WRITE = 0x02;
public static final int EXECUTE = 0x04;
public static final int DELETE = 0x08;
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