抽象方法用哪些修饰符修饰？

问：抽象的（abstract）方法是否可同时是静态的（static）,是否可同时是本地方法（native），是否可同时被synchronized修饰？ 

答：

实例说明：

public abstract class Demo {

int a;
public  Demo(int a) {
this.a = a;
}

public abstract static void f1();  //报错
public abstract native void f2();  //报错

        public abstract synchronized void f3();  //报错

        private abstract void f4();  //报错

        abstract void f5();  //编译通过

}

编译报错： 

The abstract method f1 in type Demo can only set a visibility modifier, one of public or protected

The abstract method f2 in type Demo can only set a visibility modifier, one of public or protected

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The abstract method f3 in type Demo can only set a visibility modifier, one of public or protected

The abstract method f4 in type Demo can only set a visibility modifier, one of public or protected

abstract 方法只能用访问修饰符 public 或者protected！

原文地址：https://blog.csdn.net/hz_lizx/article/details/54970797