3) Using the concept of interface, write a Java Program that calculates and prints the areas of triangle, square and rectangle.
package Program3;
interface shapes {
abstract void print();
abstract void calc();
}
class triangle implements shapes {
public int a, b, area;
triangle(int p, int q) {
a = p;
b = q;
}
public void calc() {
area = a * b;
}
public void print() {
System.out.println("Triangle area" + area);
}
}
class rectangle implements shapes {
public int a, b, area;
rectangle(int p, int q) {
a = p;
b = q;
}
public void calc() {
area = a * b;
}
public void print() {
System.out.println("Rectangle area" + area);
}
}
class square implements shapes {
public int a, area;
square(int p) {
a = p;
}
public void calc() {
area = a * a;
}
public void print() {
System.out.println("Square area" + area);
}
}
public class ShapesInterface {
public static void main(String args[]) {
shapes obj = new triangle(5, 10);
obj.calc();
obj.print();
obj = new rectangle(5, 10);
obj.calc();
obj.print();
obj = new square(5);
obj.calc();
obj.print();
}
}
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