Java使用枚举来消除if else（转载）

public enum Grade {

A_10_90(90, 100, "A"), B_90_80(80, 90, "B"), C_80_60(60, 80, "C"), D_60_0(0, 60, "D"), OTHER(-1, -1, "E");

private int start;

private int end;

private String grade;

Grade(int start, int end, String grade) {

this.setStart(start);

this.setEnd(end);

this.setGrade(grade);

}

public int getStart() {

return start;

}

public void setStart(int start) {

this.start = start;

}

public int getEnd() {

return end;

}

public void setEnd(int end) {

this.end = end;

}

public String getGrade() {

return grade;

}

public void setGrade(String grade) {

this.grade = grade;

}

public static String getGrade(int score) {

for (Grade grade : values()) {

if (grade.getStart() <= score && score < grade.getEnd()) {

return grade.getGrade();

}

}

return OTHER.getGrade();

}

public class GradeTest {

@Test

public void test() {

System.out.println(Grade.getGrade(78));

}

}