[英]convert String to Array in Java
I have a txt file like this: 我有一个这样的txt文件:
5 5
1 1个
3 3
6 6
9 9
I want to read them using java and store all of the numbers into a array.How do I do that? 我想使用Java读取它们并将所有数字存储到数组中,该怎么做? read them in as string and convert to arrray?
以字符串形式读取它们并转换为错误? (how to convert?) the file only contain ints.
(如何转换?)文件仅包含整数。
I tried read them into a string and use this to convert 我试着将它们读成字符串并用它来转换
static public int[] strToA(String str)
{
int len = str.length();
int[] array = new int[len];
for (int i = 0; i < len; i++)
{
array[i] = Integer.parseInt(str.substring(i,i+1));
}
return array;
}
Scanner can help you read your file, and you can use a List
or something else to store the info. 扫描仪可以帮助您读取文件,并且可以使用
List
或其他方式存储信息。
After that, you can use this List
to convert your Array
. 之后,您可以使用此
List
转换Array
。
public static Integer[] read2array(String filePath) throws IOException {
List<Integer> result = new ArrayList<Integer>();
RandomAccessFile randomAccessFile = new RandomAccessFile(filePath, "r");
String line = null;
while(null != (line = randomAccessFile.readLine())) {
result.add(new Integer(line));
}
randomAccessFile.close();
return result.toArray(new Integer[result.size()]);
}
Code would be something like this. 代码将是这样的。 This is untested code and may have Syntax errors.
这是未经测试的代码,可能有语法错误。
Path file = "yourfile";
// open file
try (InputStream in = Files.newInputStream(file);
BufferedReader reader =
new BufferedReader(new InputStreamReader(in))) {
String line = null;
intArr = new int[10]; // bad code could fail if file has more than 10
int i = 0;
while ((line = reader.readLine()) != null) {
intArr[i++] = Integer.parseInt(line); // parse String to int
}
} catch (IOException x) {
System.err.println(x);
}
To use List instead of array change line 使用列表而不是数组更改行
intArr = new int[10];
to 至
List intArr = new ArrayList();
Code would be something like 代码就像
List intArr = new ArrayList();
while ((line = reader.readLine()) != null) {
intArr.add(Integer.parseInt(line)); // parse String to int
}
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