java中抽象類和抽象方法到底什么關(guān)系

抽象類和抽象方法什么關(guān)系？抽象類中可能有抽象方法，也可能沒有抽象方法。那位說，就跟沒說一樣，那抽象類和抽象方法都叫抽象，他們必定有關(guān)系，那關(guān)系是什么呢？如果一個(gè)類中有抽象方法，它必須得是抽象類。
馬克- to-win：馬克 java社區(qū)：防盜版實(shí)名手機(jī)尾號(hào)： 73203。
An abstract class may have no abstract method，such as the following class Car. 馬  克- t  o --wi n： At this time,the only point and the meaning of abstract class is that we can not instantiated the class, because it is abstract class.Why an abstract class can have a nonabstract method? what is the point? also in logic, think over the following example, car is a bit abstract in that you dont' know exactly whether it is a truck or a jeep or a limersine, 馬克-to-win：so it is defined as a abstract class. but no matter whether it is truck,jep, or limersine, it definitely use steering wheel. so its steer() method is an ordinary method instead of an abstract method.  )
Abstract class can’t be instantiated.