[java] [student_grades] Extract method

Author: JavierCane

examples/java/java-student_grades-02_extract_method/src/main/java/tv/codely/student_grades/StudentGradeCalculator.java

@@ -31,13 +31,8 @@ public StudentGradeCalculator(final int yearToCalculate) {
 
     public float calculateGrades(final List<Pair<Integer, Float>> examsGrades, final boolean hasReachedMinimumClasses) {
         if (!examsGrades.isEmpty()) {
-            float gradesSum       = 0f;
-            int   gradesWeightSum = 0;
-
-            for (Pair<Integer, Float> examGrade : examsGrades) {
-                gradesSum += (examGrade.first() * examGrade.second() / 100);
-                gradesWeightSum += examGrade.first();
-            }
+            float gradesSum       = gradesSum(examsGrades);
+            int   gradesWeightSum = gradesWeightSum(examsGrades);
 
             if (gradesWeightSum == 100) {
                 if (hasReachedMinimumClasses) {
@@ -59,6 +54,22 @@ public float calculateGrades(final List<Pair<Integer, Float>> examsGrades, final
         }
     }
 
+    private float gradesSum(List<Pair<Integer, Float>> examsGrades) {
+        float gradesSum = 0f;
+        for (Pair<Integer, Float> examGrade : examsGrades) {
+            gradesSum += (examGrade.first() * examGrade.second() / 100);
+        }
+        return gradesSum;
+    }
+
+    private int gradesWeightSum(List<Pair<Integer, Float>> examsGrades) {
+        int gradesWeightSum = 0;
+        for (Pair<Integer, Float> examGrade : examsGrades) {
+            gradesWeightSum += examGrade.first();
+        }
+        return gradesWeightSum;
+    }
+
     private boolean hasToIncreaseOneExtraPoint() {
         boolean hasToIncreaseOneExtraPoint = false;