這個(gè)問題前面有人問過，也有人回答了。是因?yàn)閞ight的高度比left大造成的，而且應(yīng)該是在ie8+的瀏覽器才有的問題。源代碼沒有補(bǔ)充完全是不是？

package?muke.stu.one.serivce;
?//運(yùn)輸貨物的接口
public?interface?transportGoods?{
????public?String?transportGoods();
}
package?muke.stu.one.serivce;
??//運(yùn)輸人的接口
public?interface?transportPeople?{
????public??String?transportPeople();
}

//實(shí)體類：車輛
public?class?Car?{
????//名字，類型
????private?String?type;
????//價(jià)錢
????private?double?price;
????//容量
????private?String?content;
????//對(duì)應(yīng)的get，set
????public?String?getContent()?{
????????return?content;
????}
????public?void?setContent(String?content)?{
????????this.content?=?content;
????}
????public?String?getType()?{
????????return?type;
????}
????public?void?setType(String?type)?{
????????this.type?=?type;
????}
????public?double?getPrice()?{
????????return?price;
????}
????public?void?setPrice(double?price)?{
????????this.price?=?price;
????}
?????
}
?//pika子類
package?muke.stu.one.entity;
?
import?muke.stu.one.serivce.transportGoods;
import?muke.stu.one.serivce.transportPeople;
?
public?class?Pika?extends?Car?implements?transportGoods,transportPeople{
????//載貨量
????private?int?capacity;
????//載人量
????private?int?manned;
?????
????public?int?getCapacity()?{
????????return?capacity;
????}
????public?void?setCapacity(int?capacity)?{
????????this.capacity?=?capacity;
????}
????public?int?getManned()?{
????????return?manned;
????}
????public?void?setManned(int?manned)?{
????????this.manned?=?manned;
????}
????//重寫構(gòu)造方法
????public?Pika(){
????????super();
????}
????public?Pika(String?type,int?manned,int?capacity,double?price){
????????this.setType(type);
????????this.setCapacity(capacity);
????????this.setManned(manned);
????????this.setPrice(price);
????????//容量就是連個(gè)接口的內(nèi)容
????????this.setContent(transportPeople()+transportGoods());
????}
?????
?????//實(shí)現(xiàn)接口
????@Override
????public?String?transportPeople()?{
????????String?transportPeople?="載人量:"+this.getManned();
????????return?transportPeople;
?????????
????}
?
????@Override
????public?String?transportGoods()?{
????????String?transportGoods="載貨量："+this.getCapacity();
????????return?transportGoods;
????}
?????
}
?//客車類
package?muke.stu.one.entity;
?
import?muke.stu.one.serivce.transportPeople;
?
public?class?Coatch?extends?Car?implements?transportPeople{
?????//載人量
????private?int?manned;
?
????public?int?getManned()?{
????????return?manned;
????}
????public?void?setManned(int?manned)?{
????????this.manned?=?manned;
????}
????//構(gòu)造方法
????public?Coatch(){
????????super();
????}
????public?Coatch(String?type,int?manned,double?price){
????????this.setType(type);
????????this.setManned(manned);
????????this.setPrice(price);
????????this.setContent(transportPeople());
????}
????//實(shí)現(xiàn)接口
????@Override
????public?String?transportPeople()?{
????????String?transportPeople?="載人量:"+this.getManned();
????????return?transportPeople;
?????????
????}
}
//貨車類
package?muke.stu.one.entity;
?
import?muke.stu.one.serivce.transportGoods;
?
public?class?Truck?extends?Car?implements?transportGoods{
????//載貨量
????private?int?capacity;
????public?int?getCapacity()?{
????????return?capacity;
????}
????public?void?setCapacity(int?capacity)?{
????????this.capacity?=?capacity;
????}
????//構(gòu)造方法
????public?Truck(){
????????super();
????}
????public?Truck(String?type,int?capacity,double?price){
????????this.setType(type);
????????this.setCapacity(capacity);
????????this.setPrice(price);
????????this.setContent(transportGoods());
????}
????//實(shí)現(xiàn)接口
????@Override
????public?String?transportGoods()?{
????????String?transportGoods="載貨量："+this.getCapacity();
????????return?transportGoods;
????}
?????
}

接口是類，你實(shí)現(xiàn)接口那就是他的子類，

你自然就有接口的方法了，人不管你實(shí)現(xiàn)接口的類名是什么，

只要確定你實(shí)現(xiàn)了這個(gè)接口就行了，子類對(duì)象可以直接拿父類引用來用的。

這就是java多態(tài)性的具體體現(xiàn)！

同一種功能，不同的對(duì)象（子類or父類）實(shí)現(xiàn)的具體細(xì)節(jié)各不相同

望采納

接口可以實(shí)現(xiàn)多繼承，接口中定義的是抽象方法，接口需要你去實(shí)現(xiàn)。