I want to ask what the "%" + something + "" does in java? And can't we just use "=" instead of replacing " " with "="?
bar = String.format("%" + percentage +"s", " ").replace(" ", "=")
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2 Answers
Yes. It is possible to write directly like this.
bar = String.format("%" + percentage +"s", "=");
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That depends a bit on what percentage is; if it is (as I assume) an int, your code just prints "=" to the screen "percentage" times
int percentage = 20;
System.out.println(String.format("%" + percentage +"s", " ").replace(" ", "="));
//prints ====================
If that is the intention, you can't just leave the replace part out - or more specifically: it won't give you the same result:
System.out.println(String.format("%" + percentage +"s", "="));
//prints =
Explanation:
The format("%" + percentage +"s", ...) brings the second parameter to the length you have given (in this case percentage). If the length is shorter than the second parameter, it will add spaces on the left until the desired length is reached.
The first version uses that as a "trick" and replaces the spaces generated afterwards with a "=".
The second version just says: take this "=" and add spaces on the left until it has reached the desired length.
3 Comments
Vincent Zhou
hmm, so why the second code will not give me the same result? I want to print percentage times of "=“
JensS
I have added some more explanation.
JensS
If that solves your problem, could you please accept the answer to close the question.