Access Specifier and encapusulation.pdf
- 1. © yellowmatics.com confidential Access Modifiers. • It defines the accessibility or scope of a field, method, constructor, or class. • There are four types of Java access modifiers: ✓ Private ✓ Default ✓ Protected ✓ Public
- 2. © yellowmatics.com confidential Private. • The access level of a private modifier is only within the class. • It cannot be accessed from outside the class.
- 3. © yellowmatics.com confidential Default. • The access level of a default modifier is only within the package. • It cannot be accessed from outside the package. • If you do not specify any access level, it will be the default.
- 4. © yellowmatics.com confidential Protected. • The access level of a protected modifier is within the package and outside the package through child class. • If you do not make the child class, it cannot be accessed from outside the package.
- 5. © yellowmatics.com confidential Public. • The access level of a public modifier is everywhere. • It can be accessed from within the class, outside the class, within the package and outside the package.
- 6. © yellowmatics.com confidential Comparison. Access Modifier within class within package outside package by subclass only outside package Private Y N N N Default Y Y N N Protected Y Y Y N Public Y Y Y Y
- 7. © yellowmatics.com confidential Encapsulation. • It is a process of wrapping code and data together into a single unit. • The Bean class is the example of a fully encapsulated class. ADVANTAGES: • It can make the class read-only or write-only. • It provides you the control over the data. • It is a way to achieve data hiding.