****怒了！不想再错基础抽象类知识点了

关于常错抽象类默认写法方法知识点

public abstract class A { 

//1.

 abstract void eat();//right 

void sing();//wrong 

//2. 

public abstract void add1();//right 

public static abstract void add2();//wrong 

//3.图解 

public abstract void method(int a); 

public void method() { } 
}