public static void main(String[] args) {
    int[][] chessArr1 = new int[15][15];
    chessArr1[2][2] = 1;
    chessArr1[3][3] = 2;
    chessArr1[3][4] = 2;
    chessArr1[4][4] = 1;
    System.out.println("原始的二維數(shù)組");
    for (int[] arr : chessArr1) {
        for (int item : arr) {
            System.out.printf("%d\t", item);
        }
        System.out.println();
    }
    //將二維數(shù)組轉(zhuǎn)為稀疏數(shù)組
    //1.先遍歷二維數(shù)組，得到非0數(shù)據(jù)的個數(shù)
    int sum = 0;
    for (int[] arr : chessArr1) {
        for (int item : arr) {
            if (item != 0) {
                sum++;
            }
        }
    }
    //2.創(chuàng)建對應(yīng)的稀疏數(shù)組
    int[][] sparseArr = new int[sum + 1][3];
    //給稀疏數(shù)組賦值
    sparseArr[0][0] = 15;
    sparseArr[0][1] = 15;
    sparseArr[0][2] = sum;
    //3.遍歷二維數(shù)組，將非0的值放入sparseArr
    //sparseIndex：記錄是第幾個非0的數(shù)據(jù)
    int sparseIndex = 1;
    for (int i = 0; i < chessArr1.length; i++) {
        for (int j = 0; j < chessArr1.length; j++) {
            if (chessArr1[i][j] != 0) {
                sparseArr[sparseIndex][0] = i;
                sparseArr[sparseIndex][1] = j;
                sparseArr[sparseIndex][2] = chessArr1[i][j];
                sparseIndex++;
            }
        }
    }
    System.out.println("輸出稀疏數(shù)組");
    for (int[] sparse : sparseArr) {
        for (int item : sparse) {
            System.out.printf("%d\t", item);
        }
        System.out.println();
    }
    //將稀疏數(shù)組=》二維數(shù)組
    //1.先讀取稀疏數(shù)組的第一行，根據(jù)第一行的數(shù)據(jù)，創(chuàng)建原始的二維數(shù)組
    int[][] chessArr2 = new int[sparseArr[0][0]][sparseArr[0][1]];
    //2.讀取稀疏數(shù)組后幾行的數(shù)據(jù)（從第二行開始），并賦值給 原始的二維數(shù)組
    for (int i = 1; i < sparseArr.length; i++) {
        chessArr2[sparseArr[i][0]][sparseArr[i][1]] = sparseArr[i][2];
    }
    System.out.println("輸出恢復(fù)后的二維數(shù)組");
    for (int[] arr : chessArr2) {
        for (int item : arr) {
            System.out.printf("%d\t", item);
        }
        System.out.println();
    }
}