Comparable接口

public class xxx {
    public void comparableExample() {


        Car car1 = new Car("Toyota", 2006, 5000);
        Car car2 = new Car("BMW", 2007, 5000);
        Car car3 = new Car("Chrysler", 2007, 4000);


        System.out.println("Car 1 equals Car 2: " + car1.compareTo(car2));
        System.out.println("Car 1 equals Car 3: " + car1.compareTo(car3));
        System.out.println("Car 2 equals Car 3: " + car2.compareTo(car3));
        System.out.println();


        Car[] carArray = new Car[] {car1, car2, car3};
        Arrays.sort(carArray);


        for (Car car : carArray)
            System.out.println(car.toString());
    }


    class Car implements Comparable<Car> {


        private String make;
        private int year;
        private int mileage;


        public Car(String make, int year, int mileage) {


            this.make = make;
            this.year = year;
            this.mileage = mileage;

        }

//自定义排序规则

        public int compareTo(Car car) {
               
                if (this.mileage > car.getMileage())
                    return 1;
                else if (this.mileage < car.getMileage())
                    return -1;
          

                return 0;

//三目运算符的写法

        //return this.mileage>car.mileage?1:(this.mileage<car.mileage?-1:0);
        }


        public void setMake(String make) {
            this.make = make;
        }


        public void setYear(int year) {
            this.year = year;
        }


        public void setMileage(int mileage) {
            this.mileage = mileage;
        }


        public String getMake() {
            return make;
        }


        public int getYear() {
            return year;
        }


        public int getMileage() {
            return mileage;
        }


        public String toString() {


            StringBuffer buffer = new StringBuffer();
            buffer.append("Make: " + make + "\n");
            buffer.append("Year: " + year + "\n");
            buffer.append("Mileage: " + mileage + "\n");


            return buffer.toString();
        }
    }


    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        new xxx().comparableExample();
    }
}