java 我们如何找出while循环持续的次数
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How can we find out the number of times the while loop lasted
提问by razshan
while((MAP = inputFile.readLine()) != null) {
System.out.println(MAP);
}
How can we find out the number of iterations performed by the while loop? In this textfile, they can be sometimes 5 lines of data, or 100 lines of data..If they are 5 lines, the while loop probably performed 6 loops. I want that number.
我们如何找出while循环执行的迭代次数？在这个文本文件中，它们有时可以是 5 行数据，或 100 行数据。如果它们是 5 行，那么 while 循环可能执行了 6 次循环。我要那个号码
Any suggestions?
有什么建议？
采纳答案by Phoenix
Set a variable external to the while loop to be a counter, and then increment the counter in the while loop.
将 while 循环外部的变量设置为计数器，然后在 while 循环中递增计数器。
回答by Falmarri
int count = 0;
while((MAP = inputFile.readLine()) != null) {
System.out.println(MAP);
count++;
}
System.out.println(count);
回答by Hans Hermans
int iterations = 0;
while((MAP = inputFile.readLine()) != null) {
System.out.println(MAP);
iterations++;
}回答by Dave McClelland
int i = 0;
while((MAP = inputFile.readLine()) != null) {
i++;
System.out.println(MAP);
// Some other stuff
}
System.out.println(i);
回答by mhaller
Why do it yourself if you can use java.io.LineNumberReader.getLineNumber()?
如果可以使用，为什么要自己做java.io.LineNumberReader.getLineNumber()？
回答by Dallas Clark
Set a variable to 0 before the while loop and increment the variable inside the while loop. Output the variable after the while loop.
在 while 循环之前将变量设置为 0，并在 while 循环内递增该变量。在 while 循环后输出变量。
