java StdRandom, StdOut, Insertion 无法解析
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StdRandom, StdOut, Insertion cannot be resolved
提问by Aleksei Chepovoi
This code should implement sorting.
I have 3 errors:
"StdRandom cannot be resolved",
"StdOut cannot be resolved",
"Insertion cannot be resolved".
May be there are some libraries to import?
这段代码应该实现排序。
我有 3 个错误：
“无法解析
StdRandom ”、“无法解析 StdOut ”、“无法解析
插入”。
可能有一些库要导入？
public class randomDoubles
{
public static void main(String[] args)
{
int N = Integer.parseInt(args[0]);
Double[] a = new Double[N];
for(int i = 0; i < N; i++)
a[i] = StdRandom.uniform(); // error: StdRandom cannot be resolved
Insertion.sort(a); // error: Insertion cannot be resolved
for (int i = 0; i < N; i++)
StdOut.println(a[i]); // error: StdOut cannot be resolved
}
}
回答by jake
回答by Don Roby
You're definitely missing some imports of non-standard libraries here. If you want to compile and use this code as it is, you should ask your professor where to find the libraries and how to import them.
您肯定在这里缺少一些非标准库的导入。如果您想按原样编译和使用此代码，您应该询问您的教授在哪里可以找到这些库以及如何导入它们。
But if you just want an example of doing approximately what's shown here with standard java libraries, the following might suffice:
但是，如果您只是想要一个使用标准 Java 库执行此处显示的大致内容的示例，则以下内容可能就足够了：
import java.util.Arrays;
import java.util.Random;
public class RandomDoubles {
public static void main(String[] args)
{
int N = Integer.parseInt(args[0]);
Double[] a = new Double[N];
Random rand = new Random();
for(int i = 0; i < N; i++)
a[i] = rand.nextDouble();
Arrays.sort(a);
for (int i = 0; i < N; i++)
System.out.println(a[i]);
}
}
回答by Jams Brown
you can download jar from site below http://algs4.cs.princeton.edu/code/, and import it to your project
您可以从http://algs4.cs.princeton.edu/code/下面的站点下载 jar ，并将其导入到您的项目中
回答by u6949852
The link offered by others didn't handle idea. If you are idea(jetbrains intellij idea) user, you also need go to File->Project Structure->Libraries and add algs4.jar
其他人提供的链接没有处理想法。如果你是idea(jetbrains intellij idea)用户，你还需要去文件->项目结构->库并添加algs4.jar
回答by christian Martin
I had a similar issue years ago when I took the same class, the issue here is that StdRabdomand StdOutare all third party libraries written by the course authors. The only way to solve this issue is by installing libraries to your local machine like rv1822 mentioned. The installation instructions are also included in the provided link.
我类似的问题，年前就有，当我把同一类，这里的问题是，StdRabdom和StdOut是由课程作者所写的所有第三方库。解决此问题的唯一方法是将库安装到您的本地机器上，如提到的 rv1822。安装说明也包含在提供的链接中。
