Java Method for checking if a class extends another class? [duplicate]

问题

This question already has answers here:

How do I determine if a class extends another class in Java? (4 answers)

Closed 7 years ago.

Is there any method for checking if a one class extends another class? Above code is snippet

  File[] fileList = file.listFiles();
        if(fileList != null){
            for(int i = 0; i < fileList.length; ++i){
                ClassName = fileList[i].getName();
                if (fileList[i].isFile() && (Class Extends Class2) && ClassName.endsWith(".class")){
                    String ClassName1 = ClassName.split("\\.")[0];
                    if (!ClassName1.contains("$")){
                        if (packages != null){
                        <Snippet>
                        }
                    }
                }
            }
        }

回答1:

Let's say you have classes A and B. To determine whether A extends B you can test an instance of A with instanceof operator. This is sufficient:

if((new A()) instanceof B)
    return true;

来源：https://stackoverflow.com/questions/13537183/java-method-for-checking-if-a-class-extends-another-class