Converter tests:

Change test data files extension to "java"

j2k/tests/testData/ast/class/abstractClassShape.java

@@ -0,0 +1,13 @@
+//class
+abstract class Shape {
+	public String color;
+	public Shape() {
+	}
+	public void setColor(String c) {
+		color = c;
+	}
+	public String getColor() {
+		return color;
+	}
+	public abstract double area();
+}