Function prototype: Difference between revisions
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=={{header|Java}}==
The order of declarations in Java is unimportant, so forward declaration of functions is neither needed nor supported.
The only place where function prototypes are needed is in abstract classes or interfaces, where implementation will be provided by the derived or implementing class.
<syntaxhighlight lang="java">
public final class FunctionPrototype {
public static void main(String[] aArgs) {
Rectangle rectangle = new Rectangle(10.0, 20.0);
System.out.println("Area = " + rectangle.area());
Calculator calculator = new Calculator();
System.out.println("Sum = " + calculator.sum(2, 2));
calculator.version();
}
private static class Rectangle implements Shape {
public Rectangle(double aWidth, double aLength) {
width = aWidth; length = aLength;
}
@Override
public double area() {
return length * width;
}
private final double width, length;
}
private static class Calculator extends Arithmetic {
public Calculator() {
// Statements to create the graphical
// representation of the calculator
}
@Override
public int sum(int aOne, int aTwo) {
return aOne + aTwo;
}
@Override
public void version() {
System.out.println("0.0.1");
}
}
}
interface Shape {
public double area();
}
abstract class Arithmetic {
public abstract int sum(int aOne, int aTwo);
public abstract void version();
}
</syntaxhighlight>
{{ out }}
<pre>
Area = 200.0
Sum = 4
0.0.1
</pre>
=={{header|JavaScript}}==
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