父類中有定義對(duì)象，例如課程中的馬克1型父類：

public?class?Mark1?{
????protected?String?title;
????protected?String?color;
????protected?String?movie;
????public?void?description(){
????????System.out.println("型號(hào)："+?title);
????????System.out.println("顏色："+color);
????????System.out.println("首次出現(xiàn)電影："?+movie);
????}
????private?void?fire(){
????????System.out.println("利用手臂燃料泵射出火焰");
????}

????public?static?void?main(String[]?args)?{
????????Mark1?mark1?=?new?Mark1();
????????mark1.color="銀灰色";
????????mark1.movie="鋼鐵俠1";
????????mark1.title="馬克1型";
????????mark1.description();
????????mark1.fire();
????}
}

看這第五行的

public?void?description(){

這是無返回值的方法定義，在課程的最后一章6-1中有關(guān)方法的復(fù)習(xí)中老師有講到，可以去看看視頻