Java Encapsulation
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Encapsulation
It is the process of hiding the data from the world.
To achieve this we can use:
- Declare class variables/attributes as private
- Provide public get and set methods to access and update the value of a private variable.
Benefits
- · Better control of class attributes and method
- Class attributes can be made read-only (if you only use the get method), or write-only (if you only use the set method)
- ·
Flexible: the programmer can change one part of the
code without affecting other parts
- · Increased security of data.
- Example 01:.
//Data Hiding Getter and Setter in Java
class ShapeRectangle {
private int length, width;
//Getter Method
int getLength() {
return length;
}
int getWidth() {
return width;
}
//Setter Method
void setLength(int l) {
if (l > 0)
length = l;
else
length = 0;
}
void setWidth(int w) {
if (w > 0)
width = w;
else
width = 0;
}
int area() {
return length * width;
}
}
public class get_set {
public static void main(String args[]) {
ShapeRectangle o = new ShapeRectangle();
o.setLength(10);
o.setWidth(20);
System.out.println("Length : " + o.getLength());
System.out.println("Width : " + o.getWidth());
System.out.println("Area of Rectangle : " + o.area());
}
}
Labels: Java
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