改編這題package Test;public class Scores {??? String number = "070611";??? String subject = "java程序設(shè)計(jì)";??? static float score = 82;??? char grade;??? void examGrade(float score) {??????????????? if(score<=100&&score>=90){??????????? grade='A';??????? }else if(score>=80){??????????? grade='B';??????? }else if(score>=60){??????????? grade='C';??????? }else{??????????? grade='D';??????? }??? }??????? public static void main(String[] args) {??????? Scores s=new Scores();??????? s.examGrade(score);??????? System.out.println(s.grade);??????????????????? }????}?編寫(xiě)MyScores.java程序，其中定義一個(gè)類Myscores，是Scores類的子類。要求類MyScores具有自己的變量，平時(shí)成績(jī)（ptScores）.此時(shí)學(xué)生最終成績(jī)：最終成績(jī)=考試成績(jī)*70%+平時(shí)成績(jī)*30%，然后再根據(jù)成績(jī)算出等級(jí)：90<=考試成績(jī)<=100,grade"A";80<=考試成績(jī)<=89,grade"B";60<=考試成績(jī)<=79,grade"C";考試成績(jī)<=60,grade"D";?顯示一名學(xué)生的考試等級(jí)。學(xué)生學(xué)號(hào)為“070611”，考試科目為“java程序設(shè)計(jì)”，考試成績(jī)?yōu)椤?2”，平時(shí)成績(jī)?yōu)椤?0”。?