Java：将数组写入文本文件
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Java: write an array into a text file
提问by dedalo
I'm trying to write a matrix into a text file. In order to do that I'd like to know how to write an array into a line in the text file.
我正在尝试将矩阵写入文本文件。为此，我想知道如何将数组写入文本文件中的一行。
I'll give an example:
我举个例子：
int [] array = {1 2 3 4};
int [] 数组 = {1 2 3 4};
I want to have this array in text file in the format:
我想在文本文件中使用以下格式的数组：
1 2 3 4
and not in the format:
而不是格式：
1
2
3
4
Can you help me with that?
你能帮我解决这个问题吗？
Thanks a lot
非常感谢
采纳答案by Tom
Here is a naive approach
这是一个天真的方法
//pseudocode
String line;
StringBuilder toFile = new StringBuilder();
int i=0;
for (;array.length>0 && i<array.length-2;i++){
toFile.append("%d ",array[i]);
}
toFile.append("%d",array[i]);
fileOut.write(toFile.toString());
回答by BalusC
Then don't write a new line after each item, but a space. I.e. don't use writeln()or println(), but just write()or print().
然后不要在每个项目后写一个新行，而是一个空格。即不使用writeln()or println()，而只使用write()or print()。
Maybe code snippets are more valuable, so here is a basic example:
也许代码片段更有价值，所以这是一个基本示例：
for (int i : array) {
out.print(i + " ");
}
Edit:if you don't want trailing spaces for some reasons, here's another approach:
编辑：如果您出于某些原因不想要尾随空格，这是另一种方法：
for (int i = 0; i < array.length;) {
out.print(array[i]);
if (++i < array.length) {
out.print(" ");
}
}
回答by Ismael
"Pseudocode"
“伪代码”
for( int i = 0 ; i < array.lenght ; i++ )
{
if( i + 1 != array.lenght )
{
// Not last element
out.write( i + " " );
}
else
{
// Last element
out.write( i );
}
}
回答by Bj?rn
Ok, I know Tom already provided an accepted answer - but this is another way of doing it (I think it looks better, but that's maybe just me):
好的，我知道汤姆已经提供了一个可接受的答案 - 但这是另一种方式（我认为它看起来更好，但可能只是我）：
int[] content = new int[4] {1, 2, 3, 4};
StringBuilder toFile = new StringBuilder();
for(int chunk : content) {
toFile.append(chunk).append(" ");
}
fileOut.write(toFile.toString().trim());
