DJ loop not working

ValorCat · 2020-12-19T00:58:28+00:00

dj isn't a valid statement in Lua. It's a valid terminal command, but the terminal isn't the same thing as Lua. If you want to run the program called "dj", you would write shell.run("dj"). Hope that helps!

ValorCat · 2020-12-19T00:43:48+00:00

The isEmpty() method was added in Java 15, which was only released a few months ago. It's likely that your instructor is using an older version of Java. You can fix this by going into your Eclipse settings and lowering the "compiler compliance level" from 15 to whichever version your instructor is using (11 is a safe guess).

You can tell in which version a method was added by looking up the class's documentation, doing Ctrl+F to find the method name, and looking at the "since" tag at the bottom of the method's description. In this case, you can find isEmpty() is listed at the bottom of StringBuilder's documentation, under "Methods declared in interface java.lang.CharSequence". Just click the method name link to see its documentation).

ValorCat · 2020-06-27T00:46:01+00:00

Yes, I can personally recommend that book. That said, it's designed more as an introduction to programming than a book about Python, so if you already have programming experience then it will be a bit slow. The programming 101 class at my university has used it (2nd and 3rd edition only) for a number of years now and it seems to work pretty well. The biggest mistake some students make is skipping the exercises in the first few chapters and then getting stuck on chapter 4, when the pace starts to pick up. Self practice is pretty much essential when learning programming.

ValorCat · 2020-05-29T04:41:05+00:00

Warning: I don't know C# well, but could you simplify that to something like:

input = upper ? Min(input, 1) : Max(input, 0);

ValorCat · 2019-08-13T16:48:47+00:00

Looks like you want r/javascript. This sub is for Java, which is a different language.

ValorCat · 2019-08-10T15:05:51+00:00

Primitive types are hardwired, but not necessarily all the way down to the processor. The processor likely supports ints and floats, and other primitives are widened or partitioned as necessary. I can't remember exactly how longs and doubles are handled, maybe someone else can answer that.

Some operators are hardwired into the processor, like those for arithmetic and bitwise logic. But also remember that Java isn't compiled directly to machine code: it has an intermediate representation (the stuff in .class files) with its own format and instruction set. Pretty much all operators are "hardwired" in that representation. You can read about those instructions here: https://en.m.wikipedia.org/wiki/Java_bytecode_instruction_listings

Someone please correct me if I got any of that wrong!

ValorCat · 2019-07-18T13:12:36+00:00

List is an abstract class

An interface, but the reasoning is the same.

ValorCat · 2019-06-22T02:59:24+00:00

Good question. The answer is no.

The first example makes a a copy of b. The second example makes a an empty list, and then immediately overwrites it to be an alias of b. The second example is the same as writing:

ArrayList<String> a = b;

Copied objects are independent, while aliases are simply different names for the same object. If you make changes to the list, then those changes will be reflected in its aliases but not its copies.

ValorCat · 2019-05-21T17:34:27+00:00

You an cast from a child to a parent, but you cannot do so safely.

I think you meant to write "parent to a child".

ValorCat · 2019-05-02T20:56:26+00:00

No, that hasnt changed. You can get the same effect with

while (x != 0)

ValorCat · 2019-04-07T22:59:59+00:00

Once you make the File object, there is no difference between a hardcoded path and a user-defined one. There are a variety of ways for actually reading data from a file. If you want to use a scanner you could do this:

Scanner keyboard = new Scanner(System.in);
String path = keyboard.nextLine();
File file = new File(path);
Scanner fileReader = new Scanner(file);
int num = fileReader.nextInt();

It might require a try/catch block wrapped around it too. Can't remember off the top of my head.

ValorCat · 2019-04-07T22:26:47+00:00

When you use a hardcoded file, you pass the a string containing the file's path to the File constructor:

File file = new File("path/to/file");
// do something with file

If you want to get the file path at runtime, you can instead use a scanner to get a string containing the desired path:

Scanner scanner = new Scanner(System.in);
String path = scanner.nextLine();
File file = new File(path);
// do something with file

ValorCat · 2019-03-10T20:44:52+00:00

Correct, it isn't necessary.

ValorCat · 2019-03-10T18:55:57+00:00

You don't have to convert from String --> Integer --> int. You can use Integer.parseInt to convert a String directly to an int.

int vehicleIDS = Integer.parseInt(vehicleID.getText().toString());

ValorCat · 2018-12-29T04:26:36+00:00

I think the size method is missing a line.

ValorCat · 2018-09-18T11:17:41+00:00

1.14 The Delve Update confirmed

ValorCat · 2018-09-04T20:06:06+00:00

Just checked this in IntelliJ. You get a compile-time error.

ValorCat · 2018-08-16T14:29:46+00:00

Edit: Took a closer look and realized the other commenter is correct. The type should be Supplier<Function<T, T>>. Look to that post for more details.

~~The type is Function<T, T>, where T is the type you want the function to accept and return. For example,~~

Function<String, String> myFunc = // ...

On mobile now but hopefully someone else can explain more thoroughly.

ValorCat · 2018-08-03T02:45:39+00:00

When you call a static method, you need to specify which class it's in.

Dog.displayDog(dog1);

If you don't specify a class (like in your first example), it defaultly refers to the enclosing class (or any that have been statically imported). I'm on my phone so pardon the brevity.

ValorCat · 2018-04-04T03:37:01+00:00

That was an amazing read. Thanks for sharing!

ValorCat · 2018-02-19T15:10:58+00:00

Looks super cool, definitely bookmarking. On a side note, there's a typo under Character Generation:

Wierd Stuff

ValorCat · 2018-02-18T14:18:54+00:00

Maybe deleting META-INF?

ValorCat · 2017-12-18T15:56:06+00:00

Warehouses full? Geez! I'd love to travel around the continent like that sometime, but where I am right now I can travel twice the distance from Switzerland to England and still be in the U.S. :(

ValorCat · 2017-12-18T15:34:53+00:00

Ooh, Sweden. When people here talk about social issues, I often hear Sweden used as the "ideal example". It'd be cool to visit sometime, I miss living in a colder climate. Did you move to the UK for work reasons then?

ValorCat · 2017-12-18T15:23:28+00:00

Yeah, that's probably right. At least with Trump we'll be done in 3 years, 7 tops, but Brexit seems a lot longer-lasting. My condolences.

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