java - 我的输出仅显示数组对象中的最后一个输入

Question

我正在练习如何使用数组对象，在下面的程序中我只允许创建偶数个对象，代码如下，请参阅下面的输出以了解错误

import java.util.Scanner;
public class test {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("the number of object you want to create for class X : ");
        int choose = sc.nextInt();

         X obj[] = new X[choose];

        if(choose>=2 && choose%2==0)
        {

            int input;
            for(int i=0;i<choose;i++)
            {
                System.out.print("insert the value for the "+ordinal(i+1)+" obj against odd: ");
                input=sc.nextInt();
                obj[i].odd=input;
            }
        }
        else return;

        for(int k=0;k<choose;k++)
        {
            System.out.println(obj[k].odd);
        }
    }
    public static String ordinal(int i) {
        int mod100 = i % 100;
        int mod10 = i % 10;
        if (mod10 == 1 && mod100 != 11) {
            return i + "st";
        } else if (mod10 == 2 && mod100 != 12) {
            return i + "nd";
        } else if (mod10 == 3 && mod100 != 13) {
            return i + "rd";
        } else {
            return i + "th";
        }
    }

}

class X
{
    static int odd;
}

输出显示如下

the number of object you want to create for class X : 4
insert the value for the 1st obj against odd: 5
insert the value for the 2nd obj against odd: 4
insert the value for the 3rd obj against odd: 3
insert the value for the 4th obj against odd: 2
2
2
2
2

虽然我期望我的输出是

the number of object you want to create for class X : 4
insert the value for the 1st obj against odd: 5
insert the value for the 2nd obj against odd: 4
insert the value for the 3rd obj against odd: 3
insert the value for the 4th obj against odd: 2
5
4
3
2

请告诉我需要对代码进行哪些更改，谢谢

Answer 1

您的类X的数据成员是static，这意味着它属于该类，而不是特定实例，并且您只需在每次迭代中覆盖它即可环形。相反，您应该将其作为实例成员(并且可能有一个构造函数来初始化它:

class X
{
    int odd;
    public X(int odd) {
        this.odd = odd;
    }
}

然后在循环的每次迭代中创建一个新实例:

for (int i = 0; i < choose; i++) {
    System.out.print("insert the value for the " + ordinal(i + 1) + " obj against odd: ");
    int input = sc.nextInt();
    obj[i] = new X(input);
}