package Lecture7 public class Student implements Comparable

package Lecture_7;

public class Student implements Comparable<Object>{
   Integer age;
   String state;
   String firstName;
   String lastName;
  
   public Student(Integer age, String state, String firstName, String lastName){
       this.setAge(age);
       this.setState(state);
       this.setFirstName(firstName);
       this.setLastName(lastName);
   }
  
   public Integer getAge(){
       return age;
   }
  
   public void setAge(Integer age){
       this.age = age;
   }
  
   public String getState(){
       return state;
   }
  
   public void setState(String state){
       this.state = state;
   }

   public String getFirstName(){
   return firstName;
   }

   public void setFirstName(String firstName){
   this.firstName = firstName;
   }
  
   public String getLastName(){
       return lastName;
   }

   public void setLastName(String lastName){
   this.lastName = lastName;
   }

   @Override
   public int compareTo(Object o) {
       Student nStudent = (Student)o;
   return this.getAge().compareTo(nStudent.getAge());
   }
   @Override
   public String toString(){
       return String.format(\"%3d %10s\",this.getAge(), this.getState(),this,getFirstName(),this.getLastName());
           }
  
}

I am stuck in the last part of  \"return String.format(\"%3d %10s\",this.getAge(), this.getState(),this,getFirstName(),this.getLastName())\"

my output only gives me age and state, however I need my output to print age, state, FirstName, and LastName. What do I need to add in \"%3d %10s\"<---- in there so my program will print all 4 variables, please advise.

Solution

You need to include more placeholders to print FirstName and LastName. Just add \"%s %s\" to the line you are trying to output.

Therefore, the line becomes,

return String.format (\"%3d %10s %s %s\", this.getAge(), this.getState(), this.getFirstName(), this.getLastName());

Therefore, the complete program is:

public class Student implements Comparable<Object>{
    Integer age;
    String state;
    String firstName;
    String lastName;

    public Student(Integer age, String state, String firstName, String lastName){
        this.setAge(age);
        this.setState(state);
        this.setFirstName(firstName);
        this.setLastName(lastName);
    }

    public Integer getAge(){
        return age;
    }

    public void setAge(Integer age){
        this.age = age;
    }

    public String getState(){
        return state;
    }

    public void setState(String state){
        this.state = state;
    }

    public String getFirstName(){
    return firstName;
    }

    public void setFirstName(String firstName){
    this.firstName = firstName;
    }

    public String getLastName(){
        return lastName;
    }

    public void setLastName(String lastName){
    this.lastName = lastName;
    }

    @Override
       public int compareTo(Object o) {
        Student nStudent = (Student)o;
           return this.getAge().compareTo(nStudent.getAge());
    }

    @Override
    public String toString(){
        return String.format(\"%3d %10s %s %s\",this.getAge(), this.getState(),this,getFirstName(),this.getLastName());
    }

}