写的比较通俗易懂，希望能帮助到有需要的人

import java.io.*; /** * @author hjw */ public class SparseArray { public static void main(String[] args) { //1、创建二维数组 int chess[][] = new int[11][11]; //2、赋值, 1 黑棋；2白棋 chess[1][2] = 1; chess[2][3] = 2; System.out.println("初始的二维数组"); for (int[] ints : chess) { for (int i : ints) { System.out.print(i + "\t"); } System.out.println(); } //4、遍历获取参数 int count = 0; //棋盘有效个数(非0个数) for (int[] ints : chess) { for (int i : ints) { if (i != 0) { count++; } } } //3、创建稀疏数组、赋值 int sparse[][] = new int[count + 1][3]; sparse[0][0] = chess.length; sparse[0][1] = 11; sparse[0][2] = count; int flag = 0; //计数器 //遍历二维数组 for (int i = 0; i < chess.length; i++) { for (int j = 0; j < chess[i].length; j++) { if (chess[i][j] != 0) { flag++; sparse[flag][0] = i; //行 sparse[flag][1] = j; //列 sparse[flag][2] = chess[i][j]; } } } System.out.println("初始的稀疏数组"); for (int i = 0; i < sparse.length; i++) { for (int j = 0; j < sparse[i].length; j++) { System.out.print(sparse[i][j] + "\t"); } System.out.println(); } //***************稀疏数组写出磁盘******************* FileWriter writer = null; try { writer = new FileWriter(new File("sparse.txt")); for (int[] ints : sparse) { for (int i : ints) { writer.write(i); } } } catch (IOException e) { e.printStackTrace(); } finally { try { if (writer != null) { writer.close(); } } catch (IOException e) { e.printStackTrace(); } } //***************磁盘写入稀疏数组******************* FileReader reader = null; StringBuffer buffer = new StringBuffer(); try { reader = new FileReader(new File("sparse.txt")); char[] cbuf = new char[1024]; int len; while ((len = reader.read(cbuf)) != -1) { buffer.append(cbuf,0,len); } } catch (IOException e) { e.printStackTrace(); } finally { try { if (reader != null) { reader.close(); } } catch (IOException e) { e.printStackTrace(); } } String string = new String(buffer); int chess3[][] = new int[string.length()/ 3][3]; int k=0; //计数器 for (int i = 0; i < chess3.length; i++) { for (int j = 0; j < chess3[i].length; j++) { chess3[i][j]= string.charAt(k); k++; } } System.out.println("磁盘复原的稀疏数组"); for (int[] ints : chess3) { for (int i : ints) { System.out.print(i+"\t"); } System.out.println(); } //从稀疏数组恢复二维数组 int chess2[][] = new int[chess3[0][0]][chess3[0][1]]; //读取后几行 for (int i = 1; i < chess3.length; i++) { chess2[chess3[i][0]][sparse[i][1]] = chess3[i][2]; } System.out.println("复原的二维数组"); for (int[] ints : chess2) { for (int i : ints) { System.out.print(i + "\t"); } System.out.println(); } } }