The toString method of j.a.g.AffineTransform applies rounding (via _matround) to the individual matrix values before display ,which can cause an incorrect infinity value to show up for Double.MAX_VALUE:

jshell> new java.awt.geom.AffineTransform(0,0,0,0,0,Double.MAX_VALUE);
$1 ==> AffineTransform[[0.0, 0.0, 0.0], [0.0, 0.0, Infinity]]

jshell> new java.awt.geom.AffineTransform(0,0,0,0,0,Double.POSITIVE_INFINITY);
$2 ==> AffineTransform[[0.0, 0.0, 0.0], [0.0, 0.0, Infinity]]

however,

jshell> new java.awt.geom.AffineTransform(0,0,0,0,0,Float.MAX_VALUE);
$5 ==> AffineTransform[[0.0, 0.0, 0.0], [0.0, 0.0, 3.4028234663852886E38]]