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java如何从键盘输入数组

2026-02-05 04:20:15Java

java如何从键盘输入数组

从键盘输入数组的方法

在Java中，可以通过多种方式从键盘输入数组。以下是几种常见的方法：

使用Scanner类读取固定大小的数组

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the size of the array: ");
        int size = scanner.nextInt();
        int[] array = new int[size];

        System.out.println("Enter the elements of the array:");
        for (int i = 0; i < size; i++) {
            array[i] = scanner.nextInt();
        }

        System.out.println("Array elements are:");
        for (int num : array) {
            System.out.print(num + " ");
        }
        scanner.close();
    }
}

使用BufferedReader类读取数组

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        System.out.print("Enter the size of the array: ");
        int size = Integer.parseInt(reader.readLine());
        int[] array = new int[size];

        System.out.println("Enter the elements of the array separated by space:");
        String[] input = reader.readLine().split(" ");
        for (int i = 0; i < size; i++) {
            array[i] = Integer.parseInt(input[i]);
        }

        System.out.println("Array elements are:");
        for (int num : array) {
            System.out.print(num + " ");
        }
        reader.close();
    }
}

使用Scanner类读取字符串数组

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter the size of the array: ");
        int size = scanner.nextInt();
        String[] array = new String[size];
        scanner.nextLine(); // Consume the newline

        System.out.println("Enter the elements of the array:");
        for (int i = 0; i < size; i++) {
            array[i] = scanner.nextLine();
        }

        System.out.println("Array elements are:");
        for (String str : array) {
            System.out.println(str);
        }
        scanner.close();
    }
}

使用命令行参数输入数组

public class Main {
    public static void main(String[] args) {
        if (args.length == 0) {
            System.out.println("No arguments provided.");
            return;
        }

        System.out.println("Array elements are:");
        for (String arg : args) {
            System.out.print(arg + " ");
        }
    }
}