Math.abs(rand.nextInt()) may yield negative value. rand.nextInt(Integer.MAX_VALUE) seems to be what was meant.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@739575 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/util/FileUtils.java

@@ -891,7 +891,7 @@ public class FileUtils {
             synchronized (rand) {
                 do {
                     result = new File(parent, prefix
-                            + fmt.format(Math.abs(rand.nextInt())) + suffix);
+                            + fmt.format(rand.nextInt(Integer.MAX_VALUE)) + suffix);
                 } while (result.exists());
             }
         }