java - 如何为多个整数建立1个for循环？

有没有一种方法只能对多个整数使用一个for循环？目前，我只为int num0编写了代码。但是有没有办法在相同的代码中保留其余的num1，num2，num3？我之所以要求这样做，是因为我没有作为程序员的经验，所以我想知道你们是否知道有解决方案。 （对不起，我的语法不好）

    public void exercise1c() {
      int num0, num1, num2, num3;

      num0 = Integer.parseInt(JOptionPane.showInputDialog("Write a number."));
      num1 = Integer.parseInt(JOptionPane.showInputDialog("Write a number."));
      num2 = Integer.parseInt(JOptionPane.showInputDialog("Write a number."));
      num3 = Integer.parseInt(JOptionPane.showInputDialog("Write a number."));

      for (int i = 0; i <= num0; i++) {
        if (num0 <= 0) {
            System.out.println("Number "+ num0 + " is negative.");
            break;
        }
      }
      if (num0 >= 0) {
        System.out.println(num0 + " is a integer.");
      }
      if (num0 == 0){
        System.out.println(num0 + " is zero.");
      }
    }

最佳答案

将num0, num1, num2, num3添加到List或array中，然后可以使用单个for循环

例如：使用int[]

int[] num = new int[4];
num[0] = Integer.parseInt(JOptionPane.showInputDialog("Write a number."));
num[1] = Integer.parseInt(JOptionPane.showInputDialog("Write a number."));
num[2] = Integer.parseInt(JOptionPane.showInputDialog("Write a number."));
num[3] = Integer.parseInt(JOptionPane.showInputDialog("Write a number."));

for (int i = 0; i < num.length; i++) {
   if (num[i] < 0) {
      System.out.println("Number " + num[i] + " is negative.");
      break;
   }
   if (num[i] > 0) {
      System.out.println(num[i] + " is a integer.");
   }
   if (num[i] == 0) {
      System.out.println(num[i] + " is zero.");
   }
}

如何使用List

例如：

  List<Integer> numList = new ArrayList<>();
  numList.add(Integer.parseInt(JOptionPane.showInputDialog("Write a number.")));
  numList.add(Integer.parseInt(JOptionPane.showInputDialog("Write a number.")));
  numList.add(Integer.parseInt(JOptionPane.showInputDialog("Write a number.")));
  numList.add(Integer.parseInt(JOptionPane.showInputDialog("Write a number.")));

    for (Integer i :numList) {
        if (i < 0) {
            System.out.println("Number " + i + " is negative.");
            break;
        }
        if (i > 0) {
            System.out.println(i + " is a integer.");
        }
        if (i == 0) {
            System.out.println(i + " is zero.");
        }
    }