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StringBuilder - setLength(0) vs new instantiate, what is better?


By : Jim McGrath
Date : September 16 2020, 05:00 AM
fixed the issue. Will look into that further I am not sure about your use case. But anyhow, new instantiate is always a good option rather than setting length to zero, it shows better intention of code as your code will be more understandable and readable.
The performance difference is really negligible, but your code will be simpler.
code :


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deleteCharAt or setLength, which way is better to remove last char from a StringBuilder/StringBuffer


By : Minakshi Saikia
Date : March 29 2020, 07:55 AM
wish of those help Actually, there is very little in it and is probably dependent on hardware and other factors.
The setLength() method simply alters the count and overwrites the unwanted value in the array with a zero byte.

StringBuilder setLength()


By : user3218957
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The null character is a reserved character that indicates the end of the string, so if you print something followed by \u0000, nothing else after it will be printed.
Answer is here Why stringbuilder stops adding elements after using the null character?

Java StringBuilder.setLength() - is time complexity O(1)?


By : Jason Freeman
Date : March 29 2020, 07:55 AM
hope this fix your issue I'm planning to perform lots of deletes of the last character in StringBuilders. The solution to use sb.setLength(sb.length() - 1); looks good to me. However, since these deletions will be in a loop, I need to know complexity of it. , From the documentation:

Does Java StringBuilder setLength method redundantly assign \0 to its char[] value array?


By : durgesh prasad
Date : March 29 2020, 07:55 AM
will help you It is necessary when we want to reuse StringBuilder.
Assume we remove this code in StringBuilder
code :
  if (count < newLength) {
         for (; count < newLength; count++)
             value[count] = '\0';
     }
StringBuilder builder = new StringBuilder("test");
builder.setLength(0); //the `value` still keeps "test", `count` is 0
System.out.println(builder.toString()); //print empty
builder.setLength(50); //side effect will happen here, "test" is not removed because expandCapacity still keeps the original value
System.out.println(builder.toString());  // will print test

How is it possible that StringBuilder.setLength(0) invokes Arrays.fill?


By : Nanda Kumar B
Date : March 29 2020, 07:55 AM
it helps some times There is an issue with JFR. It collects stack traces asynchronously, i.e. not only at safepoints like many other profilers do. On one hand, this makes sampling more realistic, since there is no safepoint bias. On the other hand, HotSpot JVM is not able to walk the stack correctly at any random moment of time.
HotSpot private API AsyncGetCallTrace tries to do best to recover current stack trace from any arbitrary point where a timer signal has interrupted the application. However, some places in the code are not safe for stack walking. If AsyncGetCallTrace is called at one of those places, it may return invalid stack trace or no stack trace at all.
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