如何以正确的顺序从属性文件中获取包含所有键的数组？

Question

I have the following .properties file:

0.0=value1

2.3=value2

2.45=value3

2.65=value4

2.71=value5

2.87=value6

3.66=value7

I want to get an array with the keys from this file, something containing this:

[0.0, 2.3, 2.45, 2.65, 2.71, 2.87, 3.66]

I tried this:

Properties prop = new Properties();
FileInputStream myInputStream;
myInputStream = new FileInputStream("./test.properties");
prop.load(myInputStream);
myInputStream.close();
Set set = prop.keySet();
Object vetKey[] = set.toArray();

But my set does not contain the keys in the order they appear in the file,

I don't know the reason, they appear like this:

[2.71, 3.66, 2.45, 2.3, 0.0, 2.65, 2.87]

How can I get an array with the correct sequence of keys? Like they are in the .properties :?

Answer 1

How about using a BufferedReader instead. Read each line into a string then use string.split to split each line at the '=' signs. Add array[0] from the string.split to your properties array. They'll be in order. Not the best way to do this, but it will get you what you want.

Answer 2

Arrays.sort(); or Collections.sort();

Answer 3

Have you tried using prop.keys() rather than prop.keySet()? There's a difference between wanting them in the order that they occur in the properties file and having them in sorted order. If you want them sorted, then sort them using Collections.sort()