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Java
OOP GUIDE / WORK
POINT CLASS – IMMUTABLE EXERCISE
Topics
- Immutable classes
- Code analysis
TASK – CODE
ANALYSIS
Analyze each the following versions of the Point class and state if it is an
immutable class or not.
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//A
public class
Point
{
public double x;
public double y;
}
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//B
public class
Point
{
private double x;
private double y;
}
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//C
public class
Point
{
private double x;
private double y;
public void setX(double val)
{
x = val;
}
public void setY(double val)
{
y = val;
}
public double getX()
{
return x;
}
public double getY()
{
return y;
}
}
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//D
public class
Point
{
private double x;
private double y;
public double getX()
{
return x;
}
public double getY()
{
return y;
}
}
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//E
public class
Point
{
private double x;
private double y;
public double getX()
{
return x;
}
public double getY()
{
return y;
}
public void translate(double dx, double dy)
{
x = x + dx;
y = y + dy;
}
}
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//F
public class
Point
{
private double x;
private double y;
public
String toString()
{
return "(" + x + "," + y + ")";
}
public double getX()
{
return x;
}
public double getY()
{
return y;
}
}
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//G
public class
Point
{
private double x;
private double y;
public Point()
{
x = Math.random() * 10;
y = Math.random() * 10;
}
public double getX()
{
return x;
}
public double getY()
{
return y;
}
}
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