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BaseInterface.java
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141 lines (120 loc) · 2.84 KB
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package class_ex;
import java.util.logging.Logger;
/**
* interface class 範例
*
* Java不支援多重繼承，但是interface是可以使用多重繼承概念。
*
* ! 兩物件即使介面完全一樣, 也可能會有完全不同的實作。
*
*/
public class BaseInterface {
public static void main(String[] args) {
BirdFly birdFly = new BirdFly();
birdFly.seagullFly();
birdFly.sparrowFly();
birdFly.eat();
}
}
/**
* ------- -------
* |Seagull| |Sparrow|
* ------- -------
* ^ ^
* | | implements
* \ /
* \ /
* -------
* |BirdFly|
* -------
*/
interface Seagull {
void seagullFly();
void eat();
}
interface Sparrow {
void sparrowFly();
void eat();
}
class BirdFly implements Seagull, Sparrow {
Logger logger = Logger.getLogger("BirdFly");
public void seagullFly() {
logger.info("seagull fly...");
}
public void sparrowFly() {
logger.info("sparrow fly...");
}
public void eat() {
// interface 命名方法相同一樣可以，不影響實作部分。
logger.info("BirdFly eat...");
}
}
/**
* ------- -------
* |Seagull| |Sparrow|
* ------- -------
* ^ ^
* | | extends
* \ /
* \ /
* ---------
* |AnimalFly|
* ---------
* ^
* | implements
* --------
* |FinalFly|
* --------
*/
interface AnimalFly extends Seagull, Sparrow {
void animalFly();
}
class FinalFly implements AnimalFly {
Logger logger = Logger.getLogger("FinalFly");
public void seagullFly() {
logger.info("seagull fly...");
}
public void sparrowFly() {
logger.info("sparrow fly...");
}
public void animalFly() {
logger.info("animal fly...");
}
public void eat() {
logger.info("FinalFly eat...");
}
}
/**
* interface 命名方法相同一樣可以，不影響實作部分。
*
* -------- --------
* |Seagull2| |Sparrow2|
* -------- --------
* ^ ^
* | | implements
* \ /
* \ /
* ----------
* |AnimalFly2|
* ----------
*/
interface Seagull2 {
void seagullFly();
void showInfo();
}
interface Sparrow2 {
void sparrowFly();
void showInfo();
}
class AnimalFly2 implements Seagull2, Sparrow2 {
Logger logger = Logger.getLogger("AnimalFly2");
public void seagullFly() {
logger.info("seagull fly...");
}
public void sparrowFly() {
logger.info("sparrow fly...");
}
public void showInfo() {
logger.info("call showInfo...");
}
}