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macOS Java: Method parameter default values

Y

yg17

macrumors Pentium
Original poster
Aug 1, 2004
15,027
3,002
St. Louis, MO
PHP has this, and I'm pretty sure C++ also has it for functions, where you can specify a default parameter value for a function so if it's not given in the function call, it takes a default value. Like in PHP, the syntax I believe is:

PHP: 
function myFunction($blah="asdf")

So, if you call the function using myFunction(), inside the function, $blah will have the value of "asdf". But, if you call it using myFunction("qwerty"), $blah takes on "qwerty". I tried using the same syntax in Java, and javac doesn't like it. Does anyone know what the correct syntax, if such a thing even exists, in Java is? Thanks.

BTW, if it matters, in my case, the parameter is a boolean and by default, i want it to be false unless true is passed in the method call.
 
nsutt22

nsutt22

macrumors regular
May 5, 2005
177
0
parameters?

Your are calling the function myFunction() or making it?
What is the parameters of the function?

you may have to declar your variable outside the function

can i see the functions code too
 
T

therevolution

macrumors 6502
May 12, 2003
468
0
Code: 
public void myFunction() {
    myFunction(false);
}

public void myFunction(boolean b) {
    // your code here
}
 
gekko513

gekko513

macrumors 603
Oct 16, 2003
6,301
1
Java doesn't have optional parameters. Just as well in my opinion. To get a similar behaviour, you must check for null values in the beginning.

Code: 
public void foo(Object param) {
    if (param==null)
        param = "asdf";
    ...
}

Edit: therevolution's solution is better.
 
plinden

plinden

macrumors 601
Apr 8, 2004
4,029
142
therevolution is right. Java doesn't have this syntax. You have to write a method whose signature matches what you want to call (actually that's the wrong way to think of it - API comes before app so you have to call exactly what your method is defined as)
 
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