java - 从一个类到另一个存储在数组中

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7年前关闭。





我必须编写一个程序，每个部分使用不同的类。对于第一堂课：Quest1，我计算了人口增长率。第二堂课：Quest2，我必须将增长存储到一个数组中，在那里我遇到了问题，我将如何去做呢？

public class Quest1 {

public double pop, rate;
public int day;

public void setPop(double population)
{
    pop = population;
}
public double getPOP()
{
    return pop;
}
public void setRate(double rates)
{
    rate = rates;
}
public double getRate()
{
    return rate;
}
public void setDay(int days)
{
    day = days;
}
public double getDays()
{
    return day;
}

public double getNew(double pop, int day, double rate)
{
    double popul, population = 0;
    for (double i = 0; i < day; i++)
    {
        popul = pop + (pop * rate/100);
        population = day*popul;
    }
    return population;
}

}

public class Main {


public static void main(String[] args) throws IOException{
    Scanner kd = new Scanner(System.in);
    Quest1 a = new Quest1();
    Quest2 b = new Quest2();

    double tempPop, tempRate; int tempDay;


    System.out.println("Enter Population: ");
    tempPop = kd.nextDouble();
    a.setPop(tempPop);

    System.out.println("Enter Days: ");
    tempDay = kd.nextInt();
    a.setDay(tempDay);


    System.out.println("Enter Rate: ");
    tempRate = kd.nextDouble();
    a.setRate(tempRate);


    b.storeArray();
}



public class Quest2 {


Quest1 a = new Quest1();

public void storeArray(){
    double scores [] = new double[(int) a.getDays()];
    for(int i = 0; i < a.getDays(); i++)
    {
        scores[i] = a.getNew(a.getPOP(), i+1, a.getRate());
        System.out.println(scores[i]);
    }
    return;
}

最佳答案

我认为您需要将quest1对象传递给quest2类。

b.storeArray(a);

您正在quest2。中创建Quest1的新对象，因此不会计算增长。
在quest2类中进行修改。

public void storeArray(Quest1 a){..}

希望你在问这个。