java 不能从静态上下文引用非静态字段 - Main 方法
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Non static field cannot be referenced from a static context- Main method
提问by java123999
I have 2 classes in my Spring-Bootapplication:
我的Spring-Boot应用程序中有 2 个类：
-Tasks
-任务
-Runner
-赛跑者
The runner class contains my mainmethod where I try to call a method from my Tasks class:
runner 类包含我main尝试从 Tasks 类调用方法的方法：
Runner:
赛跑者：
@Component
public class Runner {
Tasks tasks;
@Autowired
public void setTasks(Tasks tasks){
this.tasks=tasks;
}
public static void main(String[] args){
//error being caused by below line
tasks.createTaskList();
}
Tasks Class:
任务类：
@Service
public class Tasks {
public void createTaskList() {
//my code
}
//other methods
}
In my Runner, when I try to call the createTaskList() method in the Tasks class I get the following error:
在我的 Runner 中，当我尝试调用 Tasks 类中的 createTaskList() 方法时，出现以下错误：
Non static field 'tasks' cannot be referenced from a static context
How can I solve this?
我该如何解决这个问题？
采纳答案by Zircon
The main method is staticmeaning that it belongs to the class and not some object. As such, it a static context cannot reference an instance variable because it wouldn't know what instance of Runnerit would use if there even was one.
main 方法static意味着它属于类而不是某个对象。因此，它是一个静态上下文不能引用一个实例变量，因为它不知道Runner它会使用哪个实例，如果有的话。
In short, the solution is to make your Tasksobject staticin the Runnerclass.
简而言之，解决方案是在类中创建您的Tasks对象。staticRunner
