| Java |
Java doesn't have struct.
You may design a final class
or a simple class
to replace struct
class Point
{
public int x, y;
public Point(int x, int y) {
this.x = x;
this.y = y;
}
}
Point a = new Point(10, 10);
Point b = a;
a.x = 100;
System.out.println(b.x);
prints: 100
Since Point is a reference type,
b and a point to the same address,
when a's value changed, b's value changed too.
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| C# |
A struct is a user-defined value type.
It is declared in a very similar way to a class,
except that it can't inherit from any class,
nor can any class inherit from it.
struct is not a reference type.
struct Point
{
public int x, y;
public Point(int x, int y) {
this.x = x;
this.y = y;
}
}
Point a = new Point(10, 10);
Point b = a;
a.x = 100;
System.Console.WriteLine(b.x);
prints: 10
Since struct Point is a value type,
not a reference type, a's value changed
doesn't involve b's value.
structs are sealed, lightweighted
and more efficient than classes.
"Sealed" means they cannot be derived
from or have any base class other than
System.ValueType, which is derived
from Object.
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