Printing value of boolean arrays

[myst]

Hi. How do I print the value of an array. I know it has something to do with the toString method...

I wrote:

public static void main(){
   boolean [] a = {true, true};
   System.out.println(a);
}

I want true, true to appear as my output. Right now, there's jibberish on the terminal window screen. I'm using blueJ.

[PhHein]

Hi, there are a few options:

boolean [] a = {true, true};
System.out.println(Arrays.toString(a));
for (boolean b : a) {
	System.out.println(b);
}

[myst]

I'm not allowed to use class Array.

I remember there's something about when you do System.out.println(variable) it checks the toString method of the variable

[JosAH]

Right now, there's jibberish on the terminal window screen.

It's not gibberish; if a class doesn't override the toString( ... ) method (and arrays don't do that) Objects version is called which prints the canonical name of the class, followed by an at sign followed by the hashCode() of the object. On my system your array prints as: [Z@3ce53108, which means an array ([) of booleans (Z).

kind regards,

Jos

[myst]

It's not gibberish; if a class doesn't override the toString( ... ) method (and arrays don't do that) Objects version is called which prints the canonical name of the class, followed by an at sign followed by the hashCode() of the object. On my system your array prints as: [Z@3ce53108, which means an array ([) of booleans (Z).

Oh, cool.

So how do I apply the toString() method here?

I know it goes something like this:

public String toString(){
String s="";
s+="true, true";
return s;
}

[JosAH]

So how do I apply the toString() method here?

You can't add methods to an array.

kind regards,

Jos

[myst]

So can you tell me how I can get true, true as my output when I write S.o.p(a); ???

[JosAH]

So can you tell me how I can get true, true as my output when I write S.o.p(a); ???

You can't do it that way; read what PhHein wrote.

kind regards,

Jos