依据分数范围划定等级

package com.mytest.guava.common;

import static org.assertj.core.api.Assertions.assertThat;

import org.junit.Test;

import com.google.common.collect.Range;
import com.google.common.collect.RangeMap;
import com.google.common.collect.TreeRangeMap;

/**
* 范围等级用例
* @author lifeng
*
*/
public class RangeMapTest {

@Test
public void testRangeMap () {
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");

assertThat(gradeScale.get(77)).isEqualTo("C");
assertThat(gradeScale.get(90)).isEqualTo("B");
}
}