Package net.n1da.dev.euler.core

Class Problem

java.lang.Object

net.n1da.dev.euler.core.Problem

All Implemented Interfaces:

Solvable

Direct Known Subclasses:

PE0001, PE0002, PE0003, PE0004, PE0005, PE0006, PE0007, PE0008, PE0009, PE0010, PE0011, PE0012, PE0013, PE0014, PE0015, PE0016, PE0017, PE0018, PE0019, PE0020, PE0021, PE0022, PE0023, PE0024, PE0025, PE0026, PE0027, PE0028, PE0029, PE0030, PE0031, PE0032, PE0033, PE0035, PE0036, PE0037, PE0038, PE0039, PE0040, PE0041, PE0042, PE0043, PE0044, PE0045, PE0046, PE0047, PE0048, PE0049, PE0050, PE0051, PE0052, PE0053, PE0054, PE0055, PE0056, PE0057, PE0058, PE0059, PE0060, PE0061, PE0062, PE0063, PE0064, PE00XX

public abstract class Problem
extends java.lang.Object
implements Solvable

The base class for all Project Euler problems.

Since:

11.04.2015 11:39:24

Author:

Nico Danneberg

Field Summary

Fields

Modifier and Type	Field	Description
private long	end	The time in nanoseconds when the solving process got finished.
protected int	number	The number of this problem.
private long	start	The time in nanoseconds when the solving process got started.
protected java.lang.String	title	The title of this problem.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Problem(int num, java.lang.String tit)	A simple base constructor to set the given number and title

Method Summary

Modifier and Type	Method	Description
void	finish()	Standard implementation of the finishing method.
java.lang.String	getResult()	This method should be called by an external execution process.
double	getRuntime(int p)	Calculates the runtime needed to solve this problem as difference of end and start.
void	prepare()	Standard implementation of the preparing method.
private void	start()	Stores the current system's time in nanoseconds into start.
private void	stop()	stores the current system's time nanoseconds into end.
java.lang.String	toString()	It just returns the number of this problem as string representation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.n1da.dev.euler.core.Solvable

solve

Field Detail

number

protected int number

The number of this problem.

title

protected java.lang.String title

The title of this problem.

start

private long start

The time in nanoseconds when the solving process got started.

end

private long end

The time in nanoseconds when the solving process got finished.

Constructor Detail

Problem

protected Problem(int num,
                  java.lang.String tit)

A simple base constructor to set the given number and title

Parameters:

num - - the number of this problem

tit - - the title of this problem

Method Detail

getResult

public java.lang.String getResult()

This method should be called by an external execution process. It does internally the following steps by calling the necessary methods:

1. prepare the problem solving
2. start the internal timer
3. solve the problem
4. stop() the internal timer
5. finish the solving process

Finally the string given by Solvable.solve() is returned.

Returns:

the result of this problem as string

getRuntime

public double getRuntime(int p)

Calculates the runtime needed to solve this problem as difference of end and start. Since the time is stored in nanoseconds a divider - a power of 1.000 - can be used.

Parameters:

p - - the power of 1000 to transform the time (use 0 to get nanoseconds)

Returns:

- the runtime of the execution in the wanted format

start

private void start()

Stores the current system's time in nanoseconds into start.

stop

private void stop()

stores the current system's time nanoseconds into end.

prepare

public void prepare()

Standard implementation of the preparing method. It just prints an info with the number and title. It can be overridden by subclasses if needed.

Specified by:

prepare in interface Solvable

finish

public void finish()

Standard implementation of the finishing method. It just prints an info with the number. It can be overridden by subclasses if needed.

Specified by:

finish in interface Solvable

toString

public java.lang.String toString()

It just returns the number of this problem as string representation.

Overrides:

toString in class java.lang.Object

Returns:

the number as string