isAssignable

import java.util.HashMap;
import java.util.Map;

public class MapTest {

    public static void main(String[] args) {
        System.out.println(HashMap.class.isAssignableFrom(Map.class));
        System.out.println(Map.class.isAssignableFrom(HashMap.class));
    }

}

如上代码返回：

false

true

isAssignable方法的注释

Determines if the class or interface represented by this Class object is either the same as, or is a superclass or superinterface of, the class or interface represented by the specified Class parameter.

从上面这行可以看出，如果与参数类型相同，或者是参数类型的父类，都返回true