演算法 第四版 在Eclipse中呼叫Algs4庫
阿新 • • 發佈:2019-01-04
然後開始新建專案,File -> New Java Project,專案名隨便寫,如下圖
右鍵src資料夾,Add -> New Java Class,這裡需要注意Name一欄裡填寫的內容就是類名,這裡我寫了TestAlgs4,為了測試「演算法 第四版」作者給的那個測試樣例
程式碼如下:
import edu.princeton.cs.algs4.StdDraw; public class TestAlgs4 { public static void main (String[] args) { StdDraw.setScale(-1, 1); StdDraw.clear(StdDraw.BLACK); StdDraw.setPenColor(StdDraw.WHITE); StdDraw.square(0, 0, 1); // write some text StdDraw.setPenColor(StdDraw.WHITE); StdDraw.text(0, +0.95, "Hello, world! This is a test Java program."); StdDraw.text(0, -0.95, "Close this window to finish the installation."); // draw the bullseye StdDraw.setPenColor(StdDraw.BOOK_BLUE); StdDraw.filledCircle(0, 0, 0.9); StdDraw.setPenColor(StdDraw.BLACK); StdDraw.filledCircle(0, 0, 0.8); StdDraw.setPenColor(StdDraw.BOOK_BLUE); StdDraw.filledCircle(0, 0, 0.7); StdDraw.setPenColor(StdDraw.BLACK); StdDraw.filledCircle(0, 0, 0.6); // draw a picture of the textbook StdDraw.picture(0, 0, "cover.jpg", 0.65, 0.80); } }
這時候Eclipse應該會報錯無數,不要急,新增對教材庫Algs4.jar的引用:
右鍵工程名(我這裡是Algs)-> Properties -> Java Build Path -> Libraries -> Add Extenernal JARs,選中C:\Users\username\algs4\algs4.jar 即可,如圖:
點選OK退出,報錯資訊消失,編譯執行可以看到跟安裝Algs4.exe一樣的結果: