題組內容
三、物件導向程式語言
Java 使用關鍵字 extends 來表達繼承觀念：
public class Animal {
public String moveMethod() {
return "Unspecified";
}
}
public class Bird extends Animal {
public String moveMethod() {
return "fly";
}
}
public class Dog extends Animal {
public String moveMethod() {
return "run";
}
}
public class Fish extends Animal {
public String moveMethod() {
return "swim";
}
}
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