// ClassRoll.java
public class ClassRoll {
private HashMap students = new HashMap();
private void addStudent ( Student stud ) {
students.put(stud.getName(), stud) ;
}
private void removeStudent( Student stud ) {
students.remove( stud.getName() ) ;
}
public boolean changeRoll( int code, Student stud ) {
switch( code ) {
case 1: addStudent( stud );
return true ;
case 2: removeStudent( stud );
return true ;
default : return false ;
}
}
public boolean isInRoll(Student stud) {
return students.containsKey(stud.getName());
}
}
// Student.java
public class Student {
private String name;
public Student(String name) {
this.name = name;
}
public String getName() {
return name;
}
}
U have to edit code so application could work safe with any number of streams. Choose an optimal set of changes, which leads to success.
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