java介面執行個體

標籤：gpo   turn   使用   abc   xtend   年齡   his   str   stat   

1.開發系統時，主體架構使用介面，介面構成系統的骨架
2.這樣就可以通過更換介面的實作類別來更換系統的實現

public class printerDemo{public static void main(String[] args) {ColorPrinter cp = new ColorPrinter("惠普");BlackPrinter bp = new BlackPrinter("聯想");Teacher teacher = new Teacher("張三",26);School school = new School();school.setPrinter(cp);school.setPrinter(bp);school.print(school);school.print(teacher);bp.print("abc");cp.print("abc");}}class School implements IInfo{private Printer p = null;public void setPrinter(Printer p) {this.p = p;}public void print(IInfo info) {p.print(info.detail());}public String detail() {return "我是學校";}}interface IInfo{//介面，教師和學校都有的方法String detail();}abstract class Printer{private String brand;public String getBrand() {return brand;}public Printer(String brand) {//構造方法this.brand = brand;}public abstract void print(String content) ;}class ColorPrinter extends Printer{public ColorPrinter(String brand) {super(brand);}public void print(String content) {System.out.println(getBrand()+"彩色列印："+content);}}class BlackPrinter extends Printer{public BlackPrinter(String brand) {super(brand);}public void print(String content) {System.out.println(getBrand()+"黑白列印："+content);}}class Teacher implements IInfo{private String name;private int age;public Teacher(String name,int age) {this.name = name;this.age = age;}public String detail() {return "我的名字叫"+name+"，年齡是"+age;}}

 

java介面執行個體