类型

Concepts and Semantics of Programming Languages 1 Pub Date : 2018-12-07 DOI:10.1017/9781316683002.028

K. Franck, Te-Sheng Huang

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引用次数: 0

摘要

类人类{保护int id;公共无效setID (int id){这。Id = Id;}公共抽象布尔isHappy ();public void print () {System.out。println(id + "， " + isHappy());}}类父扩展人类{公共父(int id) {setID (id);}公共布尔isHappy(){返回false;} //重载公共布尔值isHappy (int age) {if (age < 25){返回true;} else{返回false;}} //重写public void print () {System.out。printf("ID %d是%s\n"， ID, isHappy());}}类Child扩展Human {public Child (int id) {setID (id);}公共布尔isHappy(){返回true;Java可以允许一个子类从一个超类扩展，但是它允许一个类实现多个接口。

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Types

class Human { protected int id; public void setID (int id) { this.id = id; } public abstract boolean isHappy (); public void print () { System.out.println(id + ", " + isHappy()); } } class Parent extends Human { public Parent (int id) { setID (id); } public boolean isHappy () { return false; } // overloading public boolean isHappy (int age) { if (age < 25) { return true; } else { return false; } } // overriding public void print () { System.out.printf("ID %d is %s\n", id, isHappy()); } } class Child extends Human { public Child (int id) { setID (id); } public boolean isHappy () { return true; } } CS333 Types Fall 2021 ‣ Java can allow one subclass extend from one super class, but it allows a class implement multiple interfaces.

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Concepts and Semantics of Programming Languages 1

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