Grades.class: DoubleArrayOps.class Grades.java javac Grades.java DoubleArrayOps.class: DoubleArrayOps.java javac DoubleArrayOps.java packages: javac ann/easyio/*.java javac hoj/*.java all: packages Grades.class clean: rm -f *.class rm -f ann/easyio/*.class rm -f hoj/*.class