用java编写一个控制台应用程序,实现以下功能:

进口?Java . util . scanner;

公共?班级?AA?{

公共?静电?作废?main(String[]?args){

扫描仪?sc?=?新的?扫描仪(system . in);

system . out . println(" Please enter:");

字符串?str?=?sc . nextline();

system . out . println(str);

字符串?s1?=?str.substring(0,str.indexOf("?));

字符串?s2?=?str.substring(str.indexOf("?)?+?1,?str . length());

int?c?=?integer . parse int(S2);

如果(c?& lt?60){

if("-a "。等于(s1)){

system . out . println(" E ");

}否则{

system . out . println(" failed ");

}

}别的?如果(c?& lt?70){

if("-a "。等于(s1)){

system . out . println(" D ");

}否则{

system . out . println(" pass ");

}

}别的?如果(c?& lt?80){

if("-a "。等于(s1)){

system . out . println(" C ");

}否则{

system . out . println(" medium ");

}

}别的?如果(c?& lt?90){

if("-a "。等于(s1)){

system . out . println(" B ");

}否则{

system . out . println(" good ");

}

}否则{

if("-a "。等于(s1)){

system . out . println(" A ");

}否则{

System.out.println("优秀");

}

}

}

}