RangeMap example

Gradescale Rangemap

@Test
public void google_guava_range_map_example () {

    RangeMap<Integer, String> gradeScale = TreeRangeMap.create();
    gradeScale.put(Range.closed(0, 60), "F");
    gradeScale.put(Range.closed(61, 70), "D");
    gradeScale.put(Range.closed(71, 80), "C");
    gradeScale.put(Range.closed(81, 90), "B");
    gradeScale.put(Range.closed(91, 100), "A");
    
    String grade = gradeScale.get(77);
    
    assertEquals("C", grade);
}