稀疏数组

1、稀疏数组的代码实现

@Test
public void test1() {
	
	int[][] num = new int[6][7];
	int count = 0;  //记录不同0的值
	num[0][3] = 22;
	num[0][6] = 15;
	num[1][1] = 11;
	num[1][5] = 17;
	num[2][3] = -6;
	num[3][5] = 39;
	num[4][0] = 91;
	num[5][2] = 28;
	System.out.println("======================普通数组=============================");
	for (int[] i : num) {
		for (int j : i) {
			if (j != 0) {
				count++;
			}
			System.out.printf("%d\t",j);
		}
		System.out.println("");
	}
	System.out.println("======================稀疏数组=============================");
	//转化为稀疏数组
	int[][] sparseArray = new int[count+1][3];
	int countNum1 = 1;
	//先放第一行的数据
	sparseArray[0][0] = num.length;   //获取行数
	sparseArray[0][1] = num[0].length; //获取列数
	sparseArray[0][2] = count;  //8个不同值
	//再放不为0的数
	for (int i = 0;i<num.length;i++) {  //行
		for (int j = 0;j<num[0].length;j++) {  //列
			if (num[i][j] != 0) {
				sparseArray[countNum1][0] = i;  //0号位为行号
				sparseArray[countNum1][1] = j;  //1号位为列号
				sparseArray[countNum1][2] = num[i][j];  //改行好列号对应的值
				countNum1++;
			}
		}
	}
	//遍历稀疏数组
	for (int[] i : sparseArray) {
		for (int j : i) {
			System.out.printf("%d\t",j);
		}
		System.out.println("");
	}
	System.out.println("=====================恢复后的普通数组==============================");
	//将稀疏数组转回普通数组
	int[][] num1 = new int[sparseArray[0][0]][sparseArray[0][1]];
	for (int i = 1 ;i<sparseArray.length;i++) {
		for (int j = 0;j<sparseArray[0].length;j++) {
			num1[sparseArray[i][0]][sparseArray[i][1]] = sparseArray[i][j];  
		}
	}
	for (int[] i : num1) {
		for (int j : i) {
			System.out.printf("%d\t",j);
		}
		System.out.println("");
	}
}