algs4 使用 DrJava 编写 Hello World on Windows

前阶段读了 Yinwang 的博客， 对 Scheme and Lisp 产生了很大的兴趣， 用 学生模式的  DrRacket IDE一步一步开始实现 How to Design Programs。

想到之前搁浅的 用 Atom 学习 Algs4 刷 LeetCode 计划， 索性 也用 对学生友好的 DrJava 重新开始。

参考 https://algs4.cs.princeton.edu/windows/

详细描述了搭建 algs4 学生环境。

This document instructs you on how to set up our Java programming environment for your Windows computer.
It also provides a step-by-step guide for creating, compiling, and executing your first Java program using either DrJava or the Command Prompt. 
All of the software used is freely available.
These instructions apply to -bit and -bit Windows , Windows , Vista SP1, and XP SP3.

• 0.   Install the Programming Environment

　　　　下载地址： https://algs4.cs.princeton.edu/windows/algs4.exe

　　 　　产生如下图日志： 详细 https://algs4.cs.princeton.edu/windows/log.txt

　　　

　　　完成之后：

　　  

　　　　看到这个图片，之后删除 algs4.exe.

　　　　

• 1.   Create the Program in DrJava

　　

/******************************************************************************
 *  Compilation:  javac HelloWorld.java
 *  Execution:    java HelloWorld
 *
 *  Prints "Hello, World". By tradition, this is everyone's first program.
 *
 *  % java HelloWorld
 *  Hello, World
 *
 *  These 17 lines of text are comments. They are not part of the program;
 *  they serve to remind us about its properties. The first two lines tell
 *  us what to type to compile and test the program. The next line describes
 *  the purpose of the program. The next few lines give a sample execution
 *  of the program and the resulting output. We will always include such
 *  lines in our programs and encourage you to do the same.
 *
 ******************************************************************************/

public class HelloWorld {

    public static void main(String[] args) {
        // Prints "Hello, World" to the terminal window.
        System.out.println("Hello, World");
    }

}

compile -> 报错 -》 好吧 终结