How to print the value of arraylist contents in my logcat?

Question

My question is how to print print the value of arraylist contents in my logcat? Each array has two string.. Do I have to change it to array first?

The following is my school class:

         public class SCHOOL {

private String schoolid;
private String schoolname;
private List<STUDENT> students = new ArrayList<>();

// getters and setters for schoolid, schoolname

public String getSchoolid() {
    return schoolid;
}
public void setSchoolid(String schoolid) {
    this.schoolid = schoolid;
}

public String getSchoolname() {
    return schoolname;
}
public void setSchoolname(String schoolname) {
    this.schoolname = schoolname;
}


public void setStudents(List<STUDENT> students) {
    this.students = students;
}


public List<STUDENT> getStudents() {return this.students;}


public void addStudent(String names, String age) {
    STUDENT student = new STUDENT();
    student.setNames(names);
    student.setAge(age);
    students.add(student);
   }

The following is my student class: public class STUDENT {

        private String names;
        private String age;

        public String getNames() {
            return names;
        }

       public void setNames(String names) {
            this.names = names;
        }

        public String getAge() {
            return age;
        }

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

The following is my main activity:

 ...

    SCHOOL school = new SCHOOL();

    school.addStudent("kent", "43");
    school.addStudent("Winnie", "42");
    school.addStudent("Dennis", "41");

    List<STUDENT> studentsList = school.getStudents();
    Log.d(tag, String.valueOf(studentsList));
    ...

The result is as followed:

    Tag Activity: [com.example.spidey.jsontosql.STUDENT@5286b6d8,    
                   com.example.spidey.jsontosql.STUDENT@5286b768, 
                   com.example.spidey.jsontosql.STUDENT@5286b7b0]

Answer 1

Override method toString() in class STUDENT . For instance:

public class STUDENT {

        String names;
        String age;

        @Override
        public String toString() {
            return "STUDENT{" +
                    "names='" + names + '\'' +
                    ", age='" + age + '\'' +
                    '}';
        }
    }

Answer 2

You can write a output method for customized output, like:

    public String outputStudents(List<STUDENT> studentsList) {
       StringBuilder sb = new StringBuilder();
       foreach (STUDENT student: studentLIst) {
               sb.append(student.names);
               sb.append(",");
               sb.append(student.age);
               sb.append(";");
       }
       return sb;
    }

And use the code below to call this function:

 List<STUDENT> studentsList = school.getStudents();
 Log.d(tag, outputStudents(studentsList));