相关疑难解决方法(0)

我有这个代码:

public static String SelectRandomFromTemplate(String template,int count) {
   String[] split = template.split("|");
   List<String> list=Arrays.asList(split);
   Random r = new Random();
   while( list.size() > count ) {
      list.remove(r.nextInt(list.size()));
   }
   return StringUtils.join(list, ", ");
}

我明白了:

06-03 15:05:29.614: ERROR/AndroidRuntime(7737): java.lang.UnsupportedOperationException
06-03 15:05:29.614: ERROR/AndroidRuntime(7737):     at java.util.AbstractList.remove(AbstractList.java:645)

这怎么会是正确的方法？Java.15

我有一个集合c1<MyClass>和一个数组a<MyClass>.我试图将数组转换为集合c2并做c1.removeAll(c2),但这引发了UnsupportedOperationException.我发现asList()Arrays类返回了Arrays.ArrayList类,并且该类继承了其实现抛出的removeAll()from .AbstractList()UnsupportedOperationException

    Myclass la[] = getMyClass();
    Collection c = Arrays.asList(la);
    c.removeAll(thisAllreadyExistingMyClass);

有没有办法删除元素？请帮忙