itself a static method. We will go through one of the amazing things where we will run an interface (not a class) after declaring main() method in it. Needless to say, we will obviously look into the benefits of defining static methods in interface, it’s overriding behavior and so on...
}// 抽象方法voidoverrideMethod(String str); }// 实现类publicclassInterfaceDemoimplementsNewInterface{publicstaticvoidmain(String[] args){InterfaceDemointerfaceDemo=newInterfaceDemo();// 调用接口静态方法NewInterface.hello();// 调用被覆写后抽象方法interfaceDemo.overrideMethod("Hello, Override Method here...
}//接口interfaceInterface{defaultvoidd(){/** * 接口的default方法d() */System.out.println("Interface.d()"); }staticvoids(){/** * 接口的static方法s() */System.out.println("Interface.s()"); }staticvoids1(){ } }//父类abstractclassSuperClass{staticvoids(){/** * 父类的static方法s(...
public static void main(String[] args) { Subclass s = new Subclass(); s.get(); InterfaceA ia = new Subclass(); ia.print(); } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31....
public static void main(String args[]){ MyDataImpl obj = new MyDataImpl(); obj.print(""); obj.isNull("abc"); } } Note thatisNull(String str)is a simple class method, it’s not overriding the interface method. For example, if we will add@Override annotationto the isNull() met...
Since static methods don’t belong to a particular object, they’re not part of the API of the classes implementing the interface; therefore, they have to be called by using the interface name preceding the method name. To understand how static methods work in interfaces, let’s refactor the...
一、问题的解决: on-static method getLastRow() cannot be referenced from a static context问题的出现主要由于是main方法是静态的,如果你在main方法中直接调用一个非静态方法这是不合法的。那么系统就会直接报错。如上述例子中的A.test(1,3);会报错。
public interface TestApi<T> { T method1(T a); } 1. 2. 3. 1.泛型类,类持有泛型,类名<T> public class ResultDto<T> { private T result; } 1. 2. 3. 2.泛型方法,方法持有泛型,方法返回类型前加<T> public static <T> void method(){ ...
public interface FilterProcess<T> { // java 7 及以前 特性 全局常量 和抽象方法 public static final String a ="22"; boolean process(T t); // java 8 特性 静态方法和默认方法 default void love(){ System.out.println("java8 特性默认方法"); } static void haha(){ System.out.println("java...
Method;import java.lang.reflect.Proxy;public class DynamicProxyTest { interface IHello { void sayHello(); } static class Hello implements IHello { @Override public void sayHello() { System.out.println("hello world"); } } static class DynamicProxy implements InvocationHandler { Object originalObj;...