class School{ public DaYin dayinji; public void anZhaung(DaYin dayinji){ this.dayinji = dayinji; } public void print(String contex){ dayinji.print(contex); } } class DaYin{ public String PinPai; public void print(String contex){ } } class HeiBaiDaYin extends DaYin{ public void print(String contex){ System.out.println("黑白打印："+contex); } } class CaiSeDaYin extends DaYin{ public void print(String contex){ System.out.println("彩色打印："+contex); } } public class Demo2 { public static void main(String[] args) { School s = new School(); HeiBaiDaYin hei = new HeiBaiDaYin(); s.anZhaung(hei); s.print("helloheise"); CaiSeDaYin cai = new CaiSeDaYin(); s.anZhaung(cai); s.print("caise"); } } 讯享网
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