如何使用java在数组中获取用户输入？

Question

如何使用 Java 在 Array 中获取用户输入？即我们不是在我们的程序中自己初始化它，而是用户将给它的值.. 请指导！！

原文由 sadia 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

Here’s a simple code that reads strings from stdin , adds them into List<String> , and then uses toArray to convert it to String[] (if你 真的 需要使用数组）。

 import java.util.*;

public class UserInput {
    public static void main(String[] args) {
        List<String> list = new ArrayList<String>();
        Scanner stdin = new Scanner(System.in);

        do {
            System.out.println("Current list is " + list);
            System.out.println("Add more? (y/n)");
            if (stdin.next().startsWith("y")) {
                System.out.println("Enter : ");
                list.add(stdin.next());
            } else {
                break;
            }
        } while (true);
        stdin.close();
        System.out.println("List is " + list);
        String[] arr = list.toArray(new String[0]);
        System.out.println("Array is " + Arrays.toString(arr));
    }
}

---

也可以看看：

• 为什么在 Java 中更喜欢使用列表而不是数组？
• 用列表数据填充数组

原文由 polygenelubricants 发布，翻译遵循 CC BY-SA 3.0 许可协议

Answer 2

package userinput;

import java.util.Scanner;

public class USERINPUT {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        //allow user  input;
        System.out.println("How many numbers do you want to enter?");
        int num = input.nextInt();

        int array[] = new int[num];

        System.out.println("Enter the " + num + " numbers now.");

        for (int i = 0 ; i < array.length; i++ ) {
           array[i] = input.nextInt();
        }

        //you notice that now the elements have been stored in the array .. array[]

        System.out.println("These are the numbers you have entered.");
        printArray(array);

        input.close();

    }

    //this method prints the elements in an array......
    //if this case is true, then that's enough to prove to you that the user input has  //been stored in an array!!!!!!!
    public static void printArray(int arr[]){

        int n = arr.length;

        for (int i = 0; i < n; i++) {
            System.out.print(arr[i] + " ");
        }
    }

}

原文由 Busker Ott 发布，翻译遵循 CC BY-SA 3.0 许可协议