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public class Triangle6 extends TwoDShape6 {

private String styleString;

// A default constructor.

public Triangle6() {

// super(); Call superclass constructor.

styleString = "none";

}

/*

* If a constructor does not explicitly invoke a superclass constructor,

* the Java compiler automatically inserts a call to the no-argument constructor of the superclass.

* If the super class does not have a no-argument constructor, you will get a compile-time error.

References:

https://web.archive.org/web/20210118184134/https://docs.oracle.com/javase/tutorial/java/IandI/super.html

*/

// Constructor

Triangle6(String s, double w, double h){

// super(w, h); Use super() to call the various forms of the TwoDShape constructor.

// width = w;

styleString = s;

}

// One argument constructor.

Triangle6(double x){

// super(x); Use super() to construct the various forms of the TwoDShape constructor.

styleString = "filled";

}

double area() {

return getWidth() * getHeight() / 2;

}

void showStyle() {

System.out.println("Triangle is " + styleString);

}

}