Java list问题求助！

yangevan55 2017-09-28 06:32:34

假设有一个车的对象，车有注册码，生产商，车型，年限，价格等属性

可不可以把这些属性储存到一个arraylist中，然后通过查询不同的属性来得到这个属性对应的全部信息呢？
或者是把这些属性储存到不同的list中，然后通过不同的条件来查询，得到结果之后自动匹配出有这个属性的所有车。

例如：查询年限，系统就打印所有符合这个年限的车辆，并包含这些车辆的其他属性；
查询注册码，系统就打印这个注册码匹配的车的所有属性信息。。。

系统推荐邀请的，各位大佬帮帮忙。。

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yangevan55 2017-09-29

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如果各位能给个例子就更好了，不胜感激！

Demon_168 2017-09-29

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直接使用数据库更加的方便，然后你只需要连接到数据库中进行操作就好了。

自由自在_Yu 2017-09-29

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引用 4 楼 yuxiangaaaaa 的回复:

import java.util.ArrayList;
import java.util.List;

public class Test {
	public static void main(String[] args) {
		Car car1 = new Car("00001", "car01", 1, 2, 100000);
		Car car2 = new Car("00002", "car02", 2, 2, 200000);
		Car car3 = new Car("00003", "car02", 3, 4, 300000);
		Car car4 = new Car("00004", "car01", 4, 4, 200000);
		List<Car> list = new ArrayList<Car>();
		list.add(car1);
		list.add(car2);
		list.add(car3);
		list.add(car4);
		// 查看年限为2年的
		for (int i = 0; i < list.size(); i++) {
			if (list.get(i).getAge() == 2) {
				System.out.println(list.get(i));
			}
		}
		System.out.println("---------------------------");
		// 根据注册码00001查看
		for (int i = 0; i < list.size(); i++) {
			if ("00001".equals(list.get(i).getId())) {
				System.out.println(list.get(i));
			}
		}
	}

}

class Car {
	public Car() {
	}

	public Car(String id, String busiName, int carType, int age, double price) {
		this.id = id;
		this.busiName = busiName;
		this.carType = carType;
		this.age = age;
		this.price = price;
	}

	// 车：注册码，生产商，车型，年限，价格
	private String id;
	private String busiName;
	private int carType;
	private int age;
	private double price;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public int getCarType() {
		return carType;
	}

	public void setCarType(int carType) {
		this.carType = carType;
	}

	public double getPrice() {
		return price;
	}

	public void setPrice(double price) {
		this.price = price;
	}

	public String getBusiName() {
		return busiName;
	}

	public void setBusiName(String busiName) {
		this.busiName = busiName;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String toString() {
		return "注册码:" + id + ",生产商:" + busiName + ",类型:" + carType + ",年限："
				+ age + ",价格：" + price;
	}
}

运行结果：注册码:00001,生产商:car01,类型:1,年限：2,价格：100000.0 注册码:00002,生产商:car02,类型:2,年限：2,价格：200000.0 --------------------------- 注册码:00001,生产商:car01,类型:1,年限：2,价格：100000.0

这样可以了吧

自由自在_Yu 2017-09-29

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import java.util.ArrayList;
import java.util.List;

public class Test {
	public static void main(String[] args) {
		Car car1 = new Car("00001", "car01", 1, 2, 100000);
		Car car2 = new Car("00002", "car02", 2, 2, 200000);
		Car car3 = new Car("00003", "car02", 3, 4, 300000);
		Car car4 = new Car("00004", "car01", 4, 4, 200000);
		List<Car> list = new ArrayList<Car>();
		list.add(car1);
		list.add(car2);
		list.add(car3);
		list.add(car4);
		// 查看年限为2年的
		for (int i = 0; i < list.size(); i++) {
			if (list.get(i).getAge() == 2) {
				System.out.println(list.get(i));
			}
		}
		System.out.println("---------------------------");
		// 根据注册码00001查看
		for (int i = 0; i < list.size(); i++) {
			if ("00001".equals(list.get(i).getId())) {
				System.out.println(list.get(i));
			}
		}
	}

}

class Car {
	public Car() {
	}

	public Car(String id, String busiName, int carType, int age, double price) {
		this.id = id;
		this.busiName = busiName;
		this.carType = carType;
		this.age = age;
		this.price = price;
	}

	// 车：注册码，生产商，车型，年限，价格
	private String id;
	private String busiName;
	private int carType;
	private int age;
	private double price;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public int getCarType() {
		return carType;
	}

	public void setCarType(int carType) {
		this.carType = carType;
	}

	public double getPrice() {
		return price;
	}

	public void setPrice(double price) {
		this.price = price;
	}

	public String getBusiName() {
		return busiName;
	}

	public void setBusiName(String busiName) {
		this.busiName = busiName;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String toString() {
		return "注册码:" + id + ",生产商:" + busiName + ",类型:" + carType + ",年限："
				+ age + ",价格：" + price;
	}
}

lifewell1 2017-09-29