问题描述
我想从SuperClass强制将SubClasses强制为@Override方法.
I would like to force SubClasses to @Override method from SuperClass.
SuperClass中的方法不能是abstract，因为我想提供一些基本的实现.
Method in SuperClass can't be abstract, cause I wanna provide some basic implementation.
这是我的代码示例:
public abstract class GenericModel<T extends GenericModel> {
long id, counter;
public String methodToBeOverridenInSubClass(String name) {
// some basic implementation
// rest details will be provided by subclass
return name;
}
}
public class SubClass extends GenericModel<SubClass> {
@Override
public String methodToBeOverridenInSubClass(String name) {
switch (name) {
case "name": return "Real name";
default: super.methodToBeOverridenInSubClass(name);
}
}
}
这篇文章很有趣: MustOverrideException和MethodNotOverridenException
请给我一些帮助
推荐答案
也许您正在寻找的内容是通过模板方法模式.在其中创建一个实现了一个方法的父类，该方法描述了一个调用另一个方法(步骤)的过程.这些步骤是抽象的，因此由子类实现.
Maybe what your are looking for is resolved by Template method pattern.In which you create a parent class with one method implemented which describe a process that calls anothers methods (steps). These steps are abstract so they are implemented by a sub class.
维基百科的示例:
/**
* An abstract class that is common to several games in
* which players play against the others, but only one is
* playing at a given time.
*/
abstract class Game {
protected int playersCount;
abstract void initializeGame();
abstract void makePlay(int player);
abstract boolean endOfGame();
abstract void printWinner();
/* A template method : */
public final void playOneGame(int playersCount) {
this.playersCount = playersCount;
initializeGame();
int j = 0;
while (!endOfGame()) {
makePlay(j);
j = (j + 1) % playersCount;
}
printWinner();
}
}
//Now we can extend this class in order
//to implement actual games:
class Monopoly extends Game {
/* Implementation of necessary concrete methods */
void initializeGame() {
// Initialize players
// Initialize money
}
void makePlay(int player) {
// Process one turn of player
}
boolean endOfGame() {
// Return true if game is over
// according to Monopoly rules
}
void printWinner() {
// Display who won
}
/* Specific declarations for the Monopoly game. */
// ...
}
class Chess extends Game {
/* Implementation of necessary concrete methods */
void initializeGame() {
// Initialize players
// Put the pieces on the board
}
void makePlay(int player) {
// Process a turn for the player
}
boolean endOfGame() {
// Return true if in Checkmate or
// Stalemate has been reached
}
void printWinner() {
// Display the winning player
}
/* Specific declarations for the chess game. */
// ...
}
这篇关于从SuperClass强制子类到@Override方法. SuperClass中的方法必须具有主体的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！