自定义异常，数值不能为负数。（注意：字母大小写、符号中西文必需和标准答案严格一致，不要有多余空格！建议在IDE环境中运行通过后，再将答案粘贴过来。）public class NoScoreException extends RuntimeException { public NoScoreException() { super(); } public NoScoreException(String message) { super(message); }}public class Student { private String name; private int score; public Student() { super(); } public Student(String name,int score){ setName(name); setScore(score); } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getScore() { return score; } public void setScore(int score) { // 判断如果score为负数xxx，就抛出NoScoreException，异常信息为：分数不能为负数：xxx if(score <0){ ； } this.score = score; }}