java如何使用字符串从数组列表中获取数据

Question

我这里有一个数组列表：

 ArrayList <vehicles> carsArray = new ArrayList<vehicles>();
    carsArray.add(new vehicles ("CAR","Peugot","3008",12500.00));
    carsArray.add(new vehicles ("CAR","BMW","316",4995.00));
    carsArray.add(new vehicles ("CAR","Ford","Fiesta",12995.00));

    carsArray.add(new vehicles ("VAN","P","3008",22500.00));
    carsArray.add(new vehicles ("VAN","B","316",24995.00));
    carsArray.add(new vehicles ("VAN","F","Fiesta",22995.00));

我想做的是浏览一下这个数组列表，只把货车拿出来。有没有办法在阵列中循环，如果车辆类型为“van”，请将其打印到控制台

谢谢

Answer 1

for (vehicles vehicles : carsArray) {
    if(vehicles.getS1().equalsIgnoreCase("Van")) {
        System.out.println(vehicles);
    }
}

Answer 2

在vehicles类中，应该为该字符串设置一个getter，然后可以轻松检查对象是否有“VAN”字符串或其他内容

class Vehicles {
  ...
  ...

   public boolean isVan() {
       return "VAN".equals(myType);
   }

}

请遵循Java命名约定，将类名更改为以大写字母开头

Answer 3

它可以是这样的：

for(int i=0; i<carsArray.size(); i++) {
    if(carsArray.get(i).getType().equals("VAN")
        System.out.println(carsArray.get(i).getModel());
}

这是假设车辆类别如下所示：

class Vehicle {
    String type;
    String brand;
    String model;
    String speed;

    private String getType() {
        return type;
    }

    private String setType(String vehType) {
        type = vehType;
    }

    ...
}

Answer 4

有。ArrayList可以使用类似数组的高级for循环。这样做：

for (vehicles vehicle : carsArray) {
    if (vehicle.getType().equals("VAN")) { //Assuming get type method exists
         System.out.println("Vehicle " + vehicle.getName() + " is a van");
    }
}

或者，如果需要索引：

for (int i = 0; i < vehicle.size(); i++) {
    if (carsArray.get(i).getType().equals("VAN")) {
        System.out.println("Vehicle at index " + i + " is a van.");
    }
}

Answer 5

for(vehicles v:  carsArray) {
    // v is vehicle obj inside carsArray
    // you can check the desired condition here
}