[英]package org.apache.commons does not exist
I'd love to use EnumeratedIntegerDistribution()
from org.apache.commons.math3.distribution
, to get discrete probabilities distribution 我很想使用
org.apache.commons.math3.distribution
EnumeratedIntegerDistribution()
来获取离散概率分布
int[] nums_to_generate = new int[] { -1, 1, 0 };
double[] discrete_probabilities = new double[] { 0.4, 0.4, 0.2 };
I'm working wiht jdk7 , on windows Xp, running from Command Line 我正在Windows XP的jdk7上运行,从命令行运行
I do: 我做:
add to my source file 添加到我的源文件
import org.apache.commons.math3;
compile my source with the classpath: (either) 用类路径编译我的源代码:
javac -cp ./commons-math3-3.2/commons-math3-3.2.jar:. ConflictsAnimation.java javac -cp commons-math3-3.2/commons-math3-3.2.jar ConflictsAnimation.java
Still I've got a mysterious 还是我有一个神秘的
"error: package org.apache.commons does not exist"
Who knows what happens ? 谁知道会发生什么? I really need a help.
我真的需要帮助
Note: 注意:
compilation (and run) is OK without the classpath and without the import of "apache" and call to numeratedIntegerDistribution().
没有类路径,也没有导入“ apache”和对numeratedIntegerDistribution()的调用,编译(和运行)就可以了。
compilation with the classpath and without the "appache"s give nonsense errors.
带有类路径但不带“ appache”的编译会产生无意义的错误。
Thanks a lot in advance for your great skills, the programmers! 预先感谢您的出色技能,程序员!
import java.lang.Math.*;
import org.apache.commons.math3;
public class CheckMe {
public CheckMe() {
System.out.println("let us check it out");
System.out.println(generate_rand_distribution (10));
}
private static int[] generate_rand_distribution (int count){
int[] nums_to_generate = new int[] { -1, 1, 0 };
double[] discrete_probabilities = new double[] { 0.4, 0.4, 0.2 };
int[] samples = null;
EnumeratedIntegerDistribution distribution =
new EnumeratedIntegerDistribution(nums_to_generate, discrete_probabilities);
samples = distribution.sample (count);
return (samples);
}
public static void main (String args[]) {
System.out.println("Main: ");
CheckMe animation = new CheckMe();
}
}
This is the problem: 这就是问题:
import org.apache.commons.math3;
That's trying to import a package - you can't do that. 尝试导入软件包 -您不能这样做。 You have to either use a wildcard import:
您必须使用通配符导入:
import org.apache.commons.math3.*;
or import a specific type: 或导入特定类型:
import org.apache.commons.math3.SomeTypeHere;
In your case it sounds like you actually want: 在您的情况下,听起来像您实际上想要的:
import org.apache.commons.math3.distribution.EnumeratedIntegerDistribution;
I've tried a sample class with just that import and the jar file downloaded from Apache, and it works fine. 我已经尝试了一个示例类,其中仅包含该导入和从Apache下载的jar文件,并且效果很好。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.