Command-line user interfaces: • The user and computer interact with one another using the commands or through program code. • The command-line interface was popular before the introduction of the Graphical User Interface (GUI). • When a command is typed to interact with the computer, it is called as “command-line interface”. • The usage of commands in interacting with the computer requires the user to know basic syntax knowledge on how the command needs to be typed such that the computer will respond accordingly. • It will be little difficult for the beginner-level user to properly learn the syntax of the commands. • The commands are entered in the prompt screen for its execution.

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Abstract classes & Interfaces (Ch13) 5. See the code below and solve the following. class Circle { protected double radius; // Default constructor public Circle() ( } this(1.0); // Construct circle with specified radius public Circle(double radius) { } this.radius radius; // Getter method for radius public double getRadius() { } return radius; // Setter method for radius public void setRadius(double radius) { } this.radius = radius; // Implement the findArea method defined in GeometricObject public double findArea() { } return radius* radius * Math. PI; // Implement the find Perimeter method defined in GeometricObject public double findPerimeter() { } return 2*radius*Math.PI; // Override the equals() method defined in the Object class public boolean equals(Circlel circle) { } return this.radius == circle.getRadius(); // Override the toString() method defined in the Object class public String toString() { } } return "[Circle] radius = " + radius; 5-1. Define a class name…

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Chapter 13.1, Problem 3CP

Program Plan Intro

Command-line user interfaces:

• The user and computer interact with one another using the commands or through program code.

• The command-line interface was popular before the introduction of the Graphical User Interface (GUI).

• When a command is typed to interact with the computer, it is called as “command-line interface”.

• The usage of commands in interacting with the computer requires the user to know basic syntax knowledge on how the command needs to be typed such that the computer will respond accordingly.

• It will be little difficult for the beginner-level user to properly learn the syntax of the commands.

• The commands are entered in the prompt screen for its execution.

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Abstract classes & Interfaces (Ch13) 5. See the code below and solve the following. class Circle { protected double radius; // Default constructor public Circle() ( } this(1.0); // Construct circle with specified radius public Circle(double radius) { } this.radius radius; // Getter method for radius public double getRadius() { } return radius; // Setter method for radius public void setRadius(double radius) { } this.radius = radius; // Implement the findArea method defined in GeometricObject public double findArea() { } return radius* radius * Math. PI; // Implement the find Perimeter method defined in GeometricObject public double findPerimeter() { } return 2*radius*Math.PI; // Override the equals() method defined in the Object class public boolean equals(Circlel circle) { } return this.radius == circle.getRadius(); // Override the toString() method defined in the Object class public String toString() { } } return "[Circle] radius = " + radius; 5-1. Define a class name…

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