java - 从其他包访问非公共(public)类

Question

我在包序列中有一个 Logistic 类

 package sequence;

 class LogisticSeq  {

 int limit;                                         
 double lamda;                                      
 ArrayList <Double> lseq = new ArrayList <Double>();         

 LogisticSeq(int a, double b, double c) {
    limit = a;
    lseq.add(b);
    lamda = c;      }

 void sequence() throws IOException{

     File file = new File("Sequence.txt");  
     if (!file.exists()) {
        file.createNewFile();
        }}

  public class Logistic {

    public static void main (String[] args) throws IOException {
    LogisticSeq L = new LogisticSeq(50,0.4999,3.9999); 
    L.logisticsequence();
 }

如何从其他包中的类访问LogisticSeq类

Answer 1

你说:

@Hovercraft Full Of Eels I tried to change it to public but i got the error in eclipse and says to define it in its own file.

听起来您要么将 LogisticSeq 类放在一个包含多个类的文件中，要么您的类/包名称与项目的包/文件结构不匹配。

我建议您按照 Java 编译器告诉您的去做:在序列包中创建一个 LogisticSeq.java 文件，并确保该类是公共(public)的。