Solution :
public [tex]$\text{class}$[/tex] Student {
[tex]$\text{protected String}$[/tex] school[tex]$;$[/tex]
public [tex]$\text{Student}$[/tex](String school) {
[tex]$\text{this.school}$[/tex] = school;
}
public String [tex]$\text{toString}()$[/tex] {
return [tex]$\text{"student at"}$[/tex] + school;
}
}
HighSchool[tex]$\text{Student.java}$[/tex] :
public class [tex]$\text{HighSchoolStudent}$[/tex] extends Student {
public [tex]$\text{HighSchoolStudent}$[/tex](String school) {
super[tex]$\text{(school)}$[/tex];
}
public String [tex]$\text{toString}()$[/tex] {
return [tex]$\text{"high school"}$[/tex] + super.[tex]$\text{toString}()$[/tex];
}
}