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java中如何输入数组

2026-04-09 07:53:55Java

在Java中输入数组的方法

使用Scanner类从控制台输入

通过java.util.Scanner类可以方便地从控制台读取用户输入的数组数据。以下是一个完整的示例代码：

import java.util.Scanner;

public class ArrayInputExample {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入数组长度: ");
        int length = scanner.nextInt();
        int[] array = new int[length];

        System.out.println("请输入数组元素，用空格分隔:");
        for (int i = 0; i < length; i++) {
            array[i] = scanner.nextInt();
        }

        System.out.println("输入的数组为:");
        for (int num : array) {
            System.out.print(num + " ");
        }

        scanner.close();
    }
}

使用BufferedReader类输入

对于更高效的输入操作，可以使用BufferedReader类：

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

public class BufferedReaderArrayInput {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        System.out.print("请输入数组长度: ");
        int length = Integer.parseInt(reader.readLine());
        int[] array = new int[length];

        System.out.println("请输入数组元素，用空格分隔:");
        String[] input = reader.readLine().split(" ");

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

        System.out.println("输入的数组为:");
        for (int num : array) {
            System.out.print(num + " ");
        }
    }
}

命令行参数输入

可以通过main方法的参数直接接收数组：

public class CommandLineArray {
    public static void main(String[] args) {
        if (args.length == 0) {
            System.out.println("请通过命令行参数输入数组元素");
            return;
        }

        int[] array = new int[args.length];
        for (int i = 0; i < args.length; i++) {
            array[i] = Integer.parseInt(args[i]);
        }

        System.out.println("输入的数组为:");
        for (int num : array) {
            System.out.print(num + " ");
        }
    }
}

文件输入数组

从文件中读取数组数据：

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class FileArrayInput {
    public static void main(String[] args) throws FileNotFoundException {
        Scanner fileScanner = new Scanner(new File("input.txt"));

        int length = fileScanner.nextInt();
        int[] array = new int[length];

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

        System.out.println("从文件读取的数组为:");
        for (int num : array) {
            System.out.print(num + " ");
        }

        fileScanner.close();
    }
}

多维数组输入

处理二维数组的输入：

java中如何输入数组

import java.util.Scanner;

public class TwoDArrayInput {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入行数: ");
        int rows = scanner.nextInt();
        System.out.print("请输入列数: ");
        int cols = scanner.nextInt();

        int[][] matrix = new int[rows][cols];

        System.out.println("请输入矩阵元素(行优先):");
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                matrix[i][j] = scanner.nextInt();
            }
        }

        System.out.println("输入的矩阵为:");
        for (int[] row : matrix) {
            for (int num : row) {
                System.out.print(num + " ");
            }
            System.out.println();
        }

        scanner.close();
    }
}