我正在研究一种方法：“ public boolean hasModelName（String modelName）”。我试图从另一个类和数组调用方法getModelName（）但无法弄清楚如何做到这一点。我在下面发布了这个课程。当我尝试编译它时，“找不到符号 - 方法getModelName（）”。那是在兰博基尼类和数组中。该方法是一个foreach循环，您可以在那里看到LamborghiniCarLot类。那有阵列。这个课没有。底部的最后一个方法是我被困*（String hasModelName = lambo.getModelName（）; *）。我如何拥有它，我可以以某种方式使用getModelName（）或者我必须以另一种方式这样做吗？
public class LamborghiniDealershipGroup
{
private String dealershipGroupName; //e.g. Taylor's Auto Group
private ArrayList<LamborghiniCarLot> carLots; //A collection of LamborghiniCarLots
/**
* Creates carLots ArrayList object
* Does NOT add any LamborghiniCarLot objects to carLots ArrayList
*/
public LamborghiniDealershipGroup()
{
carLots = new ArrayList<LamborghiniCarLot>();
}
/**
* Creates carLots ArrayList object
* Creates the following objects
*/
public LamborghiniDealershipGroup(String dealershipGroupName)
{
carLots = new ArrayList<LamborghiniCarLot>();
//Create the first car lot
LamborghiniCarLot carlot1 = new LamborghiniCarLot();
carlot1.setLotName("Jason's vintage lambos.");
carlot1.addLamborghini(new Lamborghini(1965, "350GT", 365.3, true));
carlot1.addLamborghini(new Lamborghini(1966, "400GT 2+2", 366.3, false));
carlot1.addLamborghini(new Lamborghini(1967, "MIURA", 367.3, true));
carlot1.addLamborghini(new Lamborghini(1968, "espada", 368.3, false));
carlot1.addLamborghini(new Lamborghini(1969, "islero", 369.3, true));
carlot1.addLamborghini(new Lamborghini(1970, "jarama", 370.3, false));
carlot1.addLamborghini(new Lamborghini(1971, "urraco", 371.3, false));
carlot1.addLamborghini(new Lamborghini(1971, "urraco", 371.3, false));
carlot1.addLamborghini(new Lamborghini(1973, "countache", 373.3, false));
carlot1.addLamborghini(new Lamborghini(1974, "silhouette", 374.3, false));
carlot1.addLamborghini(new Lamborghini(1975, "jalpa", 375.3, true));
carlot1.addLamborghini(new Lamborghini(1976, "silhouette", 476.3, false));
carlot1.addLamborghini(new Lamborghini(1977, "silhouette", 377.3, true));
carlot1.addLamborghini(new Lamborghini(1978, "countache", 478.3, false));
carlot1.addLamborghini(new Lamborghini(1978, "countache", 578.3, false));
carlot1.addLamborghini(new Lamborghini(1978, "countache", 378.3, true));
carlot1.addLamborghini(new Lamborghini(1979, "silhouette", 479.3, false));
//Create the second car lot
LamborghiniCarLot carlot2 = new LamborghiniCarLot();
carlot2.setLotName("Taylor's brand new lambos.");
carlot2.addLamborghini(new Lamborghini(2006, "gallardo", 506.3, true));
carlot2.addLamborghini(new Lamborghini(2007, "gallardo", 507.3, true));
carlot2.addLamborghini(new Lamborghini(2008, "reventon", 308.3, false));
carlot2.addLamborghini(new Lamborghini(2008, "reventon", 508.3, true));
carlot2.addLamborghini(new Lamborghini(2009, "gallardo", 409.3, true));
carlot2.addLamborghini(new Lamborghini(2010, "murcielago", 310.3, false));
carlot2.addLamborghini(new Lamborghini(2011, "aventador", 411.3, false));
carlot2.addLamborghini(new Lamborghini(2012, "sesto elemento", 512.3, true));
//Add them to the arraylist
carLots.add(carlot1);
carLots.add(carlot2);
}
/**
* accessor method to get car lots
* @return car lots
*/
public ArrayList<LamborghiniCarLot> getCarLots()
{
return carLots;
}
/**
* mutator method to set car lots
* @param car lots
*/
public void setCarLots(ArrayList<LamborghiniCarLot> setCarLots)
{
this.carLots = carLots;
}
/**
* accessor method that returns dealership group name
* @return dealership group name
*/
public String getDealershipGroupName()
{
return dealershipGroupName;
}
/**
* mutator method that sets dealership group name
* @param - dealershipGroupName
*/
public void setDealershipGroupName(String dealershipGroupName)
{
this.dealershipGroupName = dealershipGroupName;
}
/**
* Adds the carLot provided to the carLots ArrayList
* Does not add to the carLots ArrayList if carLot is null
*/
public void addCarLot(LamborghiniCarLot carLot)
{
if(carLot != null)
{
carLots.add(carLot);
}
}
/**
* Using a foreach loop, gets the total inventory of car lots
* Returns 0 if carLots ArrayList is null
*/
public int getTotalInventoryCount()
{
int totalIC = 0;
int cars = 0;
for(LamborghiniCarLot l : carLots){
if(l.getInventory().equals(getCarLots())){
l.getInventory().size();
cars++;
}
}
return cars;
}
/**
* Returns true if the model name exists in ANY of the car lots
* Returns false if the model name cannot be found, or if the carLots ArrayList is null
* Uses a case-insensitive search(e.g. I can pass in "diablo", or "DIABLo", and still
* find the same, correct model name)
*/
public boolean hasModelName(String modelName)
{
boolean found = false;
for(LamborghiniCarLot lambo : carLots)
{
String hasModelName = lambo.getModelName();
if(hasModelName.equalsIgnoreCase(modelName))
{
found = true;
break;
}
}
return found;
}
答案 0 :(得分：0)
从一开始就考虑这一点。你有一个LamborghiniDealershipGroup。该组在其LamborghiniCarLot数组中有多个carLots个对象。每个LamborghiniCarLot对象在某个数组中都有一些Lamboughini个对象。您想获得那些Lamboughini对象的模型名称。因此，首先迭代该组的车辆，并遍历每个车辆的车辆。
public boolean hasModelName(String modelName)
{
for(LamborghiniCarLot carLot : carLots)
{
for(Lamborghini lambo : carLot.getInventory()) //TODO: substitute in the right name
{
if(lambo.getModelName().equalsIgnoreCase(modelName)) return true;
}
}
return false;
}
答案 1 :(得分：0)
假设您在private ArrayList<Lamborghini> inventory;课程中定义了LamborghiniCarLot，并且已经定义了一个getter
public ArrayList<Lamborghini> getInventory() {
return inventory;
}
现在，这是您的问题的解决方案：
public boolean hasModelName(String modelName) {
for(LamborghiniCarLot carLot : carLots) {
for(Lamborghini lambo : carLot.getInventory()) {
if(lambo.getModelName().equalsIgnoreCase(modelName)) {
return true;
}
}
}
return false;
}
当然，必须在public String getModelName()类中定义方法Lamborghini。