1

我的数据已被放入一个数组中，但不幸的是不是按照我想要的顺序...

String[][] databaseToArray = {
  //{"Name", "Channel", "Description", "Amount", "isReady"},
    {"John", "Nick",    "likes",       "2",      "yes"    },
    {"Drew", "MTV",     "dislikes",    "4",      "no"     },
    {"Fred", "CNN",     "okay",        "3",      "no"     },
    {"Beth", "Fox",     "valid",       "1",      "yes"    }
};

我如何操作这个数组，以便当我循环遍历它时，顺序是数量，类似于SELECT * FROM "databaseToArray" ORDER BY "Amount"aka

String[][] reorganizedArray = {
  //{"Name", "Channel", "Description", "Amount", "isReady"},
    {"Beth", "Fox",     "valid",       "1",      "yes"    },
    {"John", "Nick",    "likes",       "2",      "yes"    },
    {"Fred", "CNN",     "okay",        "3",      "no"     },
    {"Drew", "MTV",     "dislikes",    "4",      "no"     }
};
4

2 回答 2

2

您需要将Comparator传递给 Arrays.sort 方法。我已经 5 年没有做过 Java 了，但它应该很容易做到。也许有人可以清理我即将写的这个例子，因为我很确定我会出错。

String[][] databaseToArray = {
  //{"Name", "Channel", "Description", "Amount", "isReady"},
    {"John", "Nick",    "likes",       "2",      "yes"    },
    {"Drew", "MTV",     "dislikes",    "4",      "no"     },
    {"Fred", "CNN",     "okay",        "3",      "no"     },
    {"Beth", "Fox",     "valid",       "1",      "yes"    }
};

Arrays.sort(databaseToArray, new Comparator<String[]>() {
    public int compare(String[] a, String[] b) {
        return a[3].compareTo(b[3]);
    }
});
于 2010-02-17T12:25:42.470 回答
-1

我在处理网站上找到了排序方法，但这仅适用于一维数组...

http://processing.org/reference/sort_.html

   float[] a = { 3, 5, 2, 4, 1 };
   a = sort(a);
   println(a);
// Prints 1, 2, 3, 4, 5
于 2010-02-17T11:10:24.817 回答