we are going to create a new subclass of the SimpleGeometricObject class, named Triangle. Copy the source code of the SimpleGeometricObject class from the following link: https://liveexample.pearsoncmg.com/html/SimpleGeometricObject.html TASK 1: Create a Triangle class that extends the SimpleGeometricObject class in Eclipse, following the below UML diagram. Use the following formula to calculate the area of a triangle: A = 1/2 × base × height TASK 2: Create a TestTriangle class in an individual .java file. In the main method, (1) Create a Triangle object with default base and height values. (2) Create a Triangle object with specified base = 3 and height =4. TASK 3: Add a toString() method to the Triangle class. In this toString() method, (1) Print the base, height, and area of a Triangle object. (2) Call the toString() method of the superclass using the super key word. Then, in the main method of the TestTriangle class, make the two Triangle objects that you created in Task 2 call the toString() method of the Triangle class. Ensure it runs without errors. show your console output. TASK 4: Let’s test the method overriding. 1. Add a void testOverriding() method to the SimpleGeometricObject class. Make it print “This is the testOverriding() method of the SimpleGeometricObject class”. 2. In the main method of the TestTriangle class, make the two Triangle objects that you created in Task 2 call the testOverriding () method. Ensure it runs without errors. show your console output. 3. Override the testOverriding() method in the Triangle class. Make it print “This is the overridden testOverriding() method”. 4. In the main method of the TestTriangle class, make the two Triangle objects that you created in Task 2 call the testOverriding () method. Ensure it runs without errors.

EBK JAVA PROGRAMMING

9th Edition

ISBN:9781337671385

Author:FARRELL

Publisher:FARRELL

Chapter11: Advanced Inheritance Concepts

Section: Chapter Questions

Problem 5PE

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Question

we are going to create a new subclass of the SimpleGeometricObject class, named
Triangle. Copy the source code of the SimpleGeometricObject class from the following link:

https://liveexample.pearsoncmg.com/html/SimpleGeometricObject.html

TASK 1: Create a Triangle class that extends the SimpleGeometricObject class in Eclipse, following
the below UML diagram.

Use the following formula to calculate the area of a triangle:

A = 1/2 × base × height

TASK 2: Create a TestTriangle class in an individual .java file. In the main method,
(1) Create a Triangle object with default base and height values.
(2) Create a Triangle object with specified base = 3 and height =4.

TASK 3: Add a toString() method to the Triangle class. In this toString() method,
(1) Print the base, height, and area of a Triangle object.
(2) Call the toString() method of the superclass using the super key word.
Then, in the main method of the TestTriangle class, make the two Triangle objects that you
created in Task 2 call the toString() method of the Triangle class. Ensure it runs without errors.
show your console output.

TASK 4: Let’s test the method overriding.
1. Add a void testOverriding() method to the SimpleGeometricObject class. Make it print
“This is the testOverriding() method of the SimpleGeometricObject class”.
2. In the main method of the TestTriangle class, make the two Triangle objects that you
created in Task 2 call the testOverriding () method.
Ensure it runs without errors. show your console output.
3. Override the testOverriding() method in the Triangle class. Make it print “This is the
overridden testOverriding() method”.

4. In the main method of the TestTriangle class, make the two Triangle objects that you

created in Task 2 call the testOverriding () method.
Ensure it runs without errors.

←
Lab 5: Inheritance X
→ C
Introduction to Ja X
Show Code With Line Numbers
public class SimpleGeometricObject {
private String color = "white";
private boolean filled;
private java.util.Date' dateCreated;
/** Construct a default geometric object */
public SimpleGeometricObject() {
dateCreated new java.util.Date();
/** Construct a geometric object with the specified color
and filled value */
public SimpleGeometricObject(String color, boolean filled) {
liveexample.pearsoncmg.com/html/SimpleGeometricObject.html
dateCreated = new java.util.Date();
this.color= color;
this filled filled;
}
/** Return color */
public String getColor() {
return color;
}
/** Set a new color */
public void setColor (String color) {
this.color= color;
}
/** Return filled. Since filled is boolean,
its get method is named isFilled */
public boolean isFilled() {
return filled;
}
}
/** Set a new filled /
public void setFilled (boolean filled) {
this filled filled;
}
/** Get dateCreated */
public java.util.Date getDateCreated() {
return dateCreated;
}
/** Return a string representation of this object */
public String toString() {
+
return "created on dateCreated + "\ncolor: "+color+
and filled: " + filled;
34°F
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Unit 7 AS1: Assig X
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Bb Blackboard Learn X
a
Bb 4970112
x b Success Confirma x +
X
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4x
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7:10 PM
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:

+ base:double = 5
+ height:double = 10
Page
Triangle
TASK 1: Create a Triangle class that extends the SimpleGeometricObject class in Eclipse, following
the below UML diagram.
1
+ Triangle()
+ Triangle(newBase: double, newHeight: double)
+ getArea(): double
+ setBase(): void
+ setHeight(): void
+ getBase(): double
+ getHeight(): double
of 3
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+

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