小编Rif*_*ers的帖子

谁能告诉我如何计算一个类的实例数？

这是我的代码

public class Bicycle {

    //instance variables
    public int gear, speed, seatHeight;
    public String color;

    //constructor
    public Bicycle(int gear, int speed, int seatHeight, String color) {
        gear = 0;
        speed = 0;
        seatHeight = 0;
        color ="Unknown";      
    }

    //getters and setters
    public int getGear() {
        return gear;
    }
    public void setGear(int Gear) {
        this.gear = Gear;
    }

    public int getSpeed() {
        return speed;
    }
    public void setSpeed(int Speed){
        this.speed = Speed;
    }

    public int getSeatHeight() {
        return seatHeight;
    } …

所以我需要在1-20范围内生成10个随机整数,但我必须将它们存储在一个名为数字的数组中.然后我必须调用一个名为displayArray的方法来显示数组的内容,对于赋值我必须使用for循环来遍历数组.

displayArray方法的方法标题是:

public static void displayArray(int[] array)

这就是我所做的

public class RandomIntegers {

    static int numbers = 0;

    public static void displayArray(int[] array) {
         System.out.println(numbers + "Numbers Generated");
    }

}//end class

和

public class Random_Integers{

    public static void main(String[] args) {

        RandomIntegers[] numbers = new RandomIntegers[10];

        //Generates 10 Random Numbers in the range 1 -20
        for(int i = 0; i < numbers.length; i++) {
          numbers[i] = (int)(Math.random() * 20);

            RandomIntegers Numbers = new RandomIntegers();

            numbers[i] = Numbers;

        }//end for loop

        for …