Compat: remove Numeric constructors (java >= 9)

[jandam]

Numeric constructors are deprecated since Java 9. They should be replaced with autoboxing or by appropriate parse method.

For example following line

jts/modules/core/src/main/java/org/locationtech/jts/geom/PrecisionModel.java

Line 449 in a8b86cb

return (new Integer(sigDigits)).compareTo(new Integer(otherSigDigits));

should be replaced with:
return Integer.compare(sigDigits, otherSigDigits));

Same for other types Float/Double/Long...

[mprins]

JTS currently is at Java 8:

jts/pom.xml

Lines 42 to 44 in a8b86cb

	<!-- maven compiler target versions -->
	<maven.compiler.source>1.8</maven.compiler.source>
	<maven.compiler.target>1.8</maven.compiler.target>

[jandam]

Yes JTS is at Java 8. But it is used on newer versions by other projects. Using Integer::compare (since java 1.7) and Integer:parseInt (is even older) avoids creating new instances of Integer. Same for other types Double::compare, Double.parseDouble, ...
Using new Integer() was not good practice. Since java 1.5 should be replaced with static method Integer.valueOf()

[dr-jts]

Good point, and seems like a worthwhile fix. PR welcome, or I will fix when I can.