从键盘输入读取二维数组
import java.util.Scanner;public class Main {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);System.out.println("请输入二维数组的行数:");int rows = scanner.nextInt();System.out.println("请输入二维数组的列数:");int cols = scanner.nextInt();int[][] array = new int[rows][cols];for (int i = 0; i < rows; i++) {for (int j = 0; j < cols; j++) {System.out.println("请输入第" + (i + 1) + "行,第" + (j + 1) + "列的元素:");array[i][j] = scanner.nextInt();}}// 打印二维数组for (int i = 0; i < rows; i++) {for (int j = 0; j < cols; j++) {System.out.print(array[i][j] + " ");}System.out.println();}}}

从文件读取二维数组
import java.io.BufferedReader;import java.io.FileReader;import java.io.IOException;public class Main {public static void main(String[] args) {int[][] array = new int;try {BufferedReader br = new BufferedReader(new FileReader("input.txt"));String line = br.readLine();String[] values = line.split(" ");for (int i = 0; i < array.length; i++) {for (int j = 0; j < array[i].length; j++) {array[i][j] = Integer.parseInt(values[i * array[i].length + j]);}}br.close();} catch (IOException e) {e.printStackTrace();}// 打印二维数组for (int i = 0; i < array.length; i++) {for (int j = 0; j < array[i].length; j++) {System.out.print(array[i][j] + " ");}System.out.println();}}}
在上面的代码中,`input.txt`文件应该包含以空格分隔的整数,例如:
1 2 3 45 6 7 8
