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IntelliJ tells me "StdDraw" symbol cannot be resolved.
If I comment it out I can call methods from StdDraw but I have to write
StdDraw.setcanvas(500,500);
StdDraw.java is in the same directory as Solver.java.
Code:
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;
// import StdDraw;//StdDraw is in the same directory as Solver
public class Solver {
public static void main(String[] args) {
System.out.println("Solver main is running.");
StdDraw.setCanvasSize(500, 500);
StdDraw.setPenColor(StdDraw.RED);
StdDraw.filledRectangle(0,0,10,10);
I've already tried:
- Making sure Stddraw.java is in the same directory as the file I'm compiling and running
- Looking at http://introcs.cs.princeton.edu/java/stdlib/javadoc/StdDraw.html
- Searching for COMPLETE code examples, ie. code that shows how to import the library
- Searching YouTube tutorials
- Reading https://www.jetbrains.com/idea/help/library.html
- Fiddling around with adding stuff in front of StdDraw, eg. stblib.StdDraw
–
–
–
You need to add Stdlib to your local libraries of your java project.
StdDraw is part of this Stdlib library.
First you need to download the stdlib.jar file
Then you create a folder in your java project (name it "lib")
Copy & Paste the stdlib.jar inside the lib folder
Open your java project with IntelliJ.
Click File -> Project Structure -> Modules -> Dependencies
Click on the + sign and choose Library -> Java
Then you need to select your stdlib.jar inside your lib folder
Now you can use the StdDraw class. You don't need to import the class at the top of the file.
–
unless you are inside the "StdDraw" class where other methods of the "StdDraw" class call the "setCanvas" method.
Otherwise, either you have to create an instance of the "StdDraw" class first:
e.g. StdDraw stdDraw = new StdDraw();
and then use that instance to call the method:
e.g. stdDraw.setCanvas(500,500);
or you call the method this way:
StdDraw.setcanvas(500,500);
This is the basic knowledge of Java, right?
By the way, if the "StdDraw" class is in the same directory as class "Solver", you don't have to import it to use it.
I use eclipse. I put class "StdDraw" in the same package with other classes. This way, I don't have to use the "import" key word to import "StdDraw". I just use the methods of "StdDraw" the static way. You import it only when it is not in the same package.
FYI: I'm reading Robert Sedgewick's "Algorithms", in which I've never seen any direct calls to methods like the way you want:
uniform(N-i); or
printf("%.2f\n", x); or
point(x0, y0); or
line(x0, y0, x1, y1); or
circle(x, y, r); or
square(x, y, r); or
polygon(x, y); etc. etc....
Instead, it's always:
StdRandom.uniform(N-i); or
StdOut.printf("%.2f\n", x); or
StdDraw.point(x0, y0); or
StdDraw.line(x0, y0, x1, y1); or
StdDraw.circle(x, y, r); or
StdDraw.square(x, y, r); or
StdDraw.polygon(x, y); etc. etc....
I hope this helps.
You can download the library stdlib.jar here: http://introcs.cs.princeton.edu/java/stdlib/
Then import it follow this tutorial:https://stackoverflow.com/a/32853178/2048865
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