Null Object in Java
Simpliest example ever :)
class NullOutputStream extends OutputStream {
public void write(int b) {
// Do nothing
}
}
class NullPrintStream extends PrintStream {
public NullPrintStream() {
super(new NullOutputStream());
}
}
class Application {
private PrintStream debugout;
public Application(PrintStream debugout) {
this.debugout = debugout;
}
public void go() {
int sum = 0;
for (int i = 0; i < 10; i++) {
sum += i;
debugout.println("i = " + i);
}
System.out.println("sum = " + sum);
}
}
