ar.java

import areacalc.area;
import areacalc.perimeter;

//import areacalc.*;
class ar {
    public static void main(String[] args) {
        area a = new area();
        perimeter p = new perimeter();
        System.out.println("area is " + a.areaRect(4, 5));
        System.out.println("area is " + a.areaSquare(5));

        System.out.println("perimeter is " + p.perirect(4, 5));
        System.out.println("perimeter is " + p.perisquare(5));

    }

}

area.java

package areacalc;

public class area {
    public static void main(String[] args) {

    }

    public int areaRect(int length, int breadth) {
        return length * breadth;
    }

    public int areaSquare(int side) {
        return side * side;
    }

    public float areaTriangle(int base, int height) {
        return 0.5f * base * height;
    }

}

perimeter.java

package areacalc;
//this statement indicates the name of the package into which we want to include our class

public class perimeter {

    public static void main(String[] args) {
    }

    public int perisquare(int side) {
        return 4 * side;
    }

    public int perirect(int length, int breadth) {
        return 2 * (length + breadth);
    }

    public float pericircle(float radius) {
        return 2 * 3.14f * radius;
    }

}

Practical 2d User defined Package | OOPS | .md

Practical 2d -- User Defined Package