Manipulate Java object reference using class constructor

Something along these lines, I would guess:

public MyClass() {
    System.out.println(false);
    System.exit(0);
}

EDIT: I found a puzzle very similar to yours in Java Puzzlers, except in that question the only restriction was that you could not override equals, which basically makes the solution to overload it instead and simply return false. Incidentally, my solution above was also given as an alternative answer to that puzzle.

That was tough!!

public MyClass() {
    System.setOut(new PrintStream(new FilterOutputStream(System.out) {
        @Override
        public void write(byte[] b, int off, int len) throws IOException {
            if(new String(b).contains("true")) {
                byte[] text = "false".getBytes();         
                super.write(text, 0, text.length);
            }
            else {
                super.write(b, off, len);
            }
        }
    }, true));
}

Or Paul Boddington's simplified version:

PrintStream p = System.out; 
System.setOut(new PrintStream(p) { 
    @Override
    public void println(boolean b) { 
        p.println(false); 
    }
});

Another solution is

public MyClass() {
    new PrintStream(new ByteArrayOutputStream()).println(true);
    try {
        Field f = String.class.getDeclaredField("value");
        f.setAccessible(true);
        f.set("true", f.get("false"));
    } catch (Exception e) {
    }
}

The first line is needed because it is necessary for the string literal "true" to be encountered in the PrintStream class before the backing array is modified. See this question.

This is my solution

public class MyClass {

    public MyClass() {
        System.out.println("false");

        // New class
        class NewPrintStream extends PrintStream {
            public NewPrintStream(OutputStream out) {
                super(out);
            }

            @Override
            public void println(boolean b) {
                // Do nothing
            }
        }

        NewPrintStream nps = new NewPrintStream(System.out);
        System.setOut(nps);
    }

    public static void main(String[] args) {
        MyClass m = new MyClass();
        System.out.println(m.equals(m));
    }
}

Basically, this is the variation of @fikes solution.