Java Basics 109– Java Class and Methods
STEPS
1) Open Startup Project.
1-1 ) Continue from the previous tutorial, or create a new Java Application project using Project/Package Name exams and Main Class ExamDetails.
1-2 ) Your Main Class should contain the following codes.
package exams; public class ExamDetails { public static void main(String[] args) { StudentResults aStudent = new StudentResults(); String sName = aStudent.fullName("Bill Gates"); String exam = aStudent.examName("VB"); System.out.println(sName); System.out.println(exam); } } class StudentResults { private String Full_Name; private String Exam_Name; private String Exam_Score; private String Exam_Grade; StudentResults() { Full_Name = "No name given"; Exam_Name = "Unknown"; Exam_Score = "No Score"; Exam_Grade = "Unknown"; } String fullName(String aName) { Full_Name = aName; return Full_Name; } String examName(String examCode) { if (examCode.equals("VB")) { Exam_Name = "Visual Basic.NET"; } else if (examCode.equals("JV")) { Exam_Name = "Java"; } else if (examCode.equals("C#")) { Exam_Name = "C# .NET"; } else if (examCode.equals("PH")) { Exam_Name = "PHP"; } else { Exam_Name = "No Exam Selected"; } return Exam_Name; } } |
2) Add method examScore
package exams; public class ExamDetails { public static void main(String[] args) { StudentResults aStudent = new StudentResults(); String sName = aStudent.fullName("Bill Gates"); String exam = aStudent.examName("VB"); String score = aStudent.examScore(30); System.out.println(sName); System.out.println(exam); System.out.println(score); } } class StudentResults { private String Full_Name; private String Exam_Name; private String Exam_Score; private String Exam_Grade; StudentResults() { Full_Name = "No name given"; Exam_Name = "Unknown"; Exam_Score = "No Score"; Exam_Grade = "Unknown"; } String fullName(String aName) { Full_Name = aName; return Full_Name; } String examName(String examCode) { if (examCode.equals("VB")) { Exam_Name = "Visual Basic.NET"; } else if (examCode.equals("JV")) { Exam_Name = "Java"; } else if (examCode.equals("C#")) { Exam_Name = "C# .NET"; } else if (examCode.equals("PH")) { Exam_Name = "PHP"; } else { Exam_Name = "No Exam Selected"; } return Exam_Name; } String examScore(int aScore) { Exam_Score = aScore + " out of 50"; return Exam_Score; } } |
3) Add method examGrade and getGrade.
package exams; public class ExamDetails { public static void main(String[] args) { StudentResults aStudent = new StudentResults(); String sName = aStudent.fullName("Bill Gates"); String exam = aStudent.examName("VB"); String score = aStudent.examScore(30); String grade = aStudent.examGrade(30); System.out.println(sName); System.out.println(exam); System.out.println(score); System.out.println(grade); } } class StudentResults { private String Full_Name; private String Exam_Name; private String Exam_Score; private String Exam_Grade; StudentResults() { Full_Name = "No name given"; Exam_Name = "Unknown"; Exam_Score = "No Score"; Exam_Grade = "Unknown"; } String fullName(String aName) { Full_Name = aName; return Full_Name; } String examName(String examCode) { if (examCode.equals("VB")) { Exam_Name = "Visual Basic.NET"; } else if (examCode.equals("JV")) { Exam_Name = "Java"; } else if (examCode.equals("C#")) { Exam_Name = "C# .NET"; } else if (examCode.equals("PH")) { Exam_Name = "PHP"; } else { Exam_Name = "No Exam Selected"; } return Exam_Name; } String examScore(int aScore) { Exam_Score = aScore + " out of 50"; return Exam_Score; } private String getGrade(int aScore) { String examGrade = ""; if (aScore >= 0 && aScore <= 10) { examGrade = "E"; } else if (aScore >= 11 && aScore <= 20) { examGrade = "D"; } else if (aScore >= 21 && aScore <= 30) { examGrade = "C"; } else if (aScore >= 31 && aScore <= 40) { examGrade = "B"; } else if (aScore >= 41) { examGrade = "A"; } return "Grade is " + examGrade; } String examGrade(int aScore) { Exam_Grade = this.getGrade(aScore); return Exam_Grade; } } |
