Additional Java 5 Syntax Highlighting Errors in DrJava

While adding syntax highlighting for underscores and binary literals introduced in Java 7 to DrJava, I discovered that a few other numbers aren’t syntax-highlighted correctly. Some of these problems go back to the beginning of Java, others go back to Java 5, when the obscure hexadecimal floating-point literal was introduced.

Here are the numbers that give DrJava’s syntax highlighter trouble:

[cc lang=”java”]float f = 6.022137e+23f;
f = 2.f;
f = .3f;

double d = 2.;
d = .3;
d = 1e-9d;

double x = 0x1.8p1;
x = 0x1.fffffffffffffp1023;
x = 0x1.0P-1074;
x = 0x0.0000000000001P-1022;[/cc]

Did you know about these hexadecimal floating-point literals? I didn’t.

I created a bug report for these Java 5 highlighting bugs.



About Mathias

Software development engineer. Principal developer of DrJava. Recent Ph.D. graduate from the Department of Computer Science at Rice University.
This entry was posted in DrJava. Bookmark the permalink.

Leave a Reply