<分区>
public class lookFor {
//Tools
//It returns the position of an element at the ArrayList, if not found returns -1
public int User(String target, ArrayList<User> users){
for(int i = 0; i < users.size(); i++){
if(users.get(i).getUserName().equals(target)){
return i;
}
}
return -1;
}
}
出于某种原因，当我尝试调用“用户”时 This Error appears
并要求我将“user”方法设为静态方法，但我不知道它会产生什么影响。
最佳答案
静态方法属于类，非静态方法属于类的实例。
您需要创建该类的一个实例:
lookFor look = new lookFor();
然后这样写:
if(look.User(username,users)==-1){....};
Static means there is one for an entire class, whereas if it is non-static there is one for each instance of a class (object). In order to reference a non-static method you need to first create an object, and call it.
关于JAVA - 无法对非静态方法进行静态引用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33970140/