2018-10-18 java.util.ConcurrentM

参考资料
java.util.ConcurrentModificationException详解
Java ConcurrentModificationException异常原因和解决方法

报错

Exception in thread "main" java.util.ConcurrentModificationException
    at java.base/java.util.ArrayList$Itr.checkForComodification(ArrayList.java:937)
    at java.base/java.util.ArrayList$Itr.next(ArrayList.java:891)
    at Book.RemoveAuthor(Part1_1.java:38)
    at Part1_1.main(Part1_1.java:11)

代码

public class Part1_1{
  public static void main(String[] args) {
    Author author1 = new Author("Richard Hartley", "123456@gamil.com", 'M');
    Book aBook = new Book("Multiple View Geometry",author1,100,10);
    Author author2 = new Author("Peter", "456789@gamil.com", 'F');
    aBook.AddAuthor(author2);
    System.out.print(aBook.toString());
    System.out.print("\n");
    aBook.RemoveAuthor("Peter");
    System.out.print(aBook.toString());
  }
}

  public void RemoveAuthor(String name){
      for(Author author:authors){
        if(author.getName() == name){
          authors.remove(author);
        }
      }
  }

由于自身水平有限，对于参考资料的讲解，理解的并不透彻，资料中提供的解决方案看起来并不那么友好。笔者基于自己的理解，尝试换一种迭代方式试试。

代码

  public void RemoveAuthor(String name){
      for(int i = 0; i< authors.size(); i++){
        if(authors.get(i).getName() == name){
          authors.remove(authors.get(i));
        }
      }
  }

结果

Book[ name = Multiple View Geometry,[Author[ name = Richard Hartley, email = 123456@gamil.com, gender = M], Author[ name = Peter, email = 456789@gamil.com, gender = F]], price = 100.0, qty = 10]

Book[ name = Multiple View Geometry,[Author[ name = Richard Hartley, email = 123456@gamil.com, gender = M]], price = 100.0, qty = 10]

刘月林
写于浙江宁波
20181018