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Java Example: Data Encapsulation http://www.chankok.com/java-data-encapsulation/
package com.chankok.oop;
public class DataEncapsulationExample {
public static void main(String[] args) {
try {
Student student1 = new Student();
student1.setName("Chankok");
student1.setSubject("History");
student1.setMarks(-1);
System.out.println("Student 1 Name: " + student1.getName());
System.out.println("Student 1 Subject: " + student1.getSubject());
System.out.println("Student 1 Marks: " + student1.getMarks());
Student student2 = new Student();
student2.setName(null);
student2.setSubject("Mathematics");
student2.setMarks(50);
System.out.println("Student 2 Name: " + student2.getName());
System.out.println("Student 2 Subject: " + student2.getSubject());
System.out.println("Student 2 Marks: " + student2.getMarks());
} catch (Exception e) {
e.printStackTrace();
}
}
}
package com.chankok.oop;
public class Student {
private String name;
private String subject;
private int marks;
public Student() {
this.name = "Default Student Name";
}
public String getName() {
return name;
}
public void setName(String name) throws Exception {
if (name == null) {
// Not allow to set student name as null value
throw new IllegalArgumentException("Student name cannot be null");
}
this.name = name;
}
public String getSubject() {
return subject;
}
public void setSubject(String subject) {
this.subject = subject;
}
public int getMarks() {
return marks;
}
public void setMarks(int marks) {
if (marks < 0) {
// Not allow to set student marks as negative value, assign default value
this.marks = 0;
} else {
this.marks = marks;
}
}
}
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