Index
Code


Here is the code for a SmartInteger class.

This is a class that can do some basic math.

This code is ready to run -- just copy it into a file named SmartInteger.java.

public class SmartInteger {

	private int n;

	/** Returns new SmartInteger on <aNumber> */
	public SmartInteger(int aNumber) {
		this.n = aNumber;
	}

	/** Returns friendly string of this object */
	public String toString() {
		return "n: " + this.n;
	}

	/** Returns square of this number */
	public int squared() {
		return this.n * this.n;
	}

	/** Returns cube of this number */
	public int cubed() {
		return this.n * this.n * this.n;
	}

	/** Returns the square root (rounded) of this number */
	public int squareRoot() {
		return (int)Math.round(Math.sqrt(this.n));
	}

	/** Returns the quotient (rounded) of this number divided by the passed divisor */
	public int dividedBy(int divisor) {
		return (int)Math.round((double)this.n / (double)divisor);
	}

}

Code Doc


Here is the code doc (i.e., code documentation) for the SmartInteger class.

It is much more concise -- does not include the code (method bodies).

For message sending, this code doc is all we need.


	

		
public SmartInteger(int aNumber)

		
Returns new SmartInteger on 

	

	

		
public String toString()

		
Returns friendly string of this object

	

	

		
public int squared()

		
Returns square of this number

	

	

		
public int cubed()

		
Returns cube of this number

	

	

		
public int squareRoot()

		
Returns the square root (rounded) of this number

	

	

		
public int dividedBy(int divisor)

		
Returns the quotient (rounded) of this number divided by the passed divisor


Test (Example Message Sends)


Below we send some messages to a SmartInteger object.

This code is ready to run -- just copy it into a file named SmartInteger.java.

For example, the code doc tells us that the SmartInteger object type (class) understands the message squared -- thus we send it as shown below.

public class SmartInteger {

	private int n;

	/** Returns new SmartInteger on <aNumber> */
	public SmartInteger(int aNumber) {
		this.n = aNumber;
	}

	/** Returns friendly string of this object */
	public String toString() {
		return "n: " + this.n;
	}

	/** Returns square of this number */
	public int squared() {
		return this.n * this.n;
	}

	/** Returns cube of this number */
	public int cubed() {
		return this.n * this.n * this.n;
	}

	/** Returns the square root (rounded) of this number */
	public int squareRoot() {
		return (int)Math.round(Math.sqrt(this.n));
	}

	/** Returns the quotient (rounded) of this number divided by the passed divisor */
	public int dividedBy(int divisor) {
		return (int)Math.round((double)this.n / (double)divisor);
	}

}

Try-It


Try sending some messages here
































Introduction To Objects With Java (Chapter 401 - Messages)










Chapter 401 - Messages SmartInteger

Contents Overview Concepts Greeter SmartInteger Point Challenge

Chapter Top Search TOC