在Eclipse中调用Algs4库

首先下载Eclipse，我选择的是Eclipse IDE for Java Developers64位版本，下载下来之后解压缩到喜欢的位置然后双击Eclipse.exe启动

然后开始新建项目，File -> New Java Project，项目名随便写，如下图

右键src文件夹，Add -> New Java Class，这里需要注意Name一栏里填写的内容就是类名，这里我写了TestAlgs4，为了测试「算法 第四版」作者给的那个测试样例

代码如下：

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);
    }
}