使用不同类中的一种方法打印数组列表

Question

我有两个java类

public class FlightManager extends Flight
public class Aircraft implements Comparable<Aircraft> 

在FlightManager课上，我有

    ArrayList<Aircraft> airplanes = new ArrayList<Aircraft>();

public FlightManager() {

        // Create some aircraft types with max seat capacities
        airplanes.add(new Aircraft(85, "Boeing 737"));
        airplanes.add(new Aircraft(180, "Airbus 320"));
        airplanes.add(new Aircraft(37, "Dash-8 100"));
        airplanes.add(new Aircraft(12, "Bombardier 5000"));
        airplanes.add(new Aircraft(592, 14, "Boeing 747"));

.
.
.
}


// Prints all aircraft in airplanes array list. 
    // See class Aircraft for a print() method

 public void printAllAircraft() {
      
    }

对于printAllAircraft，我需要在飞机类中使用打印方法

在飞机上，我有

public void print()
    {
        System.out.println("Model: " + model + "\t Economy Seats: " + numEconomySeats + "\t First Class Seats: " + numFirstClassSeats);
    }

public Aircraft(int seats, String model)
  {
    this.numEconomySeats = seats;
    this.numFirstClassSeats = 0;
    this.model = model;
  }

  public Aircraft(int economy, int firstClass, String model)
  {
    this.numEconomySeats = economy;
    this.numFirstClassSeats = firstClass;
    this.model = model;
  }

如何创建一个飞行器对象并将该ArrayList传递给它的构造函数(如果正确的话)并使用打印方法打印所有条目？

感谢你的帮助！

Answer 1

您的飞机列表在FlightManager中，并且显示您已经在那里添加了printAllAircraft()。您需要迭代您的飞机列表，并在每个列表上调用打印，因此类似这样的内容应该可以工作：

public void printAllAircraft() {
    for(Aircraft currentPlane : this.airplanes){
        currentPlane.print();
    }
}

Answer 2

在您的FlightManager类中，您可以这样做：

ArrayList<Aircraft> airplanes = new ArrayList<Aircraft>();

public FlightManager() {
    // Create some aircraft types with max seat capacities
    airplanes.add(new Aircraft(85, "Boeing 737"));
    airplanes.add(new Aircraft(180, "Airbus 320"));
    airplanes.add(new Aircraft(37, "Dash-8 100"));
    airplanes.add(new Aircraft(12, "Bombardier 5000"));
    airplanes.add(new Aircraft(592, 14, "Boeing 747"));
    printAllAircraft(airplanes);
}
// Prints all aircraft in airplanes array list. 
// See class Aircraft for a print() method

public void printAllAircraft(ArrayList<Aircraft> airCraftList) {
   airCraftList.forEach((ac) -> ac.print());
}

我在构造器上添加了对象，所以您可以在任何地方使用它，但是可以使用您拥有的全局airplanes变量。