stringbuffer

Max size for StringBuffer

由 三世轮回 提交于 2019-12-18 04:23:04
问题 Why would the StringBuffer have a limit on its size? I went through some of the links : http://www.coderanch.com/t/540346/java/java/maximum-size-hold-String-buffer. Is that because of the count member variable, which is an int? Suppose that we have 2^31-1 chars in StringBuffer and that we append some more chars to that StringBuffer . Count member variable would be incremented by the number of chars appended and if Count variable is already at its max (2^31-1), it would revert back to some

Correctly over-loading a stringbuf to replace cout in a MATLAB mex file

由 99封情书 提交于 2019-12-18 03:36:09
问题 MathWorks currently doesn't allow you to use cout from a mex file when the MATLAB desktop is open because they have redirected stdout. Their current workaround is providing a function, mexPrintf, that they request you use instead. After googling around a bit, I think that it's possible to extend the std::stringbuf class to do what I need. Here's what I have so far. Is this robust enough, or are there other methods I need to overload or a better way to do this? (Looking for portability in a

Python equivalent of Java StringBuffer?

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-17 15:35:20
问题 Is there anything in Python like Java's StringBuffer ? Since strings are immutable in Python too, editing them in loops would be inefficient. 回答1: Efficient String Concatenation in Python is a rather old article and its main statement that the naive concatenation is far slower than joining is not valid anymore, because this part has been optimized in CPython since then: CPython implementation detail: If s and t are both strings, some Python implementations such as CPython can usually perform

In AsyncTask How to pass data from doInBackground() to main UI “instantly” and not after each loop? (BufferedReader)

由 末鹿安然 提交于 2019-12-12 07:22:21
问题 EDIT1: I did change the code such that the update was done within the while loop. HOWEVER, NO CHANGE. SHOWN THIS IN CODE BELOW. ALSO, removed other irrelevant lines on onProgressUpdate(). SHOWN IN CODE BELOW. Please answer like you would teach an amateur. I am passing data from doInBackground() to the main UI currently. It works. However, it is very slow. I want to display "instant" results and not after the loop completes. That's how the code is written, however, performance wise, if the

How does ensureCapacity work in Java?

由 99封情书 提交于 2019-12-10 10:19:59
问题 StringBuffer buff1 = new StringBuffer("tuts point"); System.out.println("Old Capacity of buff1 = " + buff1.capacity()); buff1.ensureCapacity(28); System.out.println("New Capacity of buff1 = " + buff1.capacity()); StringBuffer buff2 = new StringBuffer("compilejksde"); System.out.println("Old Capacity of buff2= " + buff2.capacity()); buff2.ensureCapacity(75); System.out.println("New Capacity of buff2= " + buff2.capacity()); 回答1: The contract states the following: Ensures that the capacity is at

how to implement a comparator for StringBuffer class in Java for use in TreeSet?

由 为君一笑 提交于 2019-12-08 08:37:13
问题 I want to implement a Comparator for StringBuffer that compares the StringBuffer and adds to TreeSet accordingly. This is purely for learning purposes only. I know having a mutable object in a Hasable collection is a bad idea. but the purpose here is how to implement comparator for existing StringBuffer class of Java and use it to create a TreeSet. My current code is below. The code does not compile. kindly help me out here. Thanks public class ComparatorExample { public class

Why StringBuffer has a toStringCache while StringBuilder not?

由 ∥☆過路亽．° 提交于 2019-12-07 02:28:47
问题 In JDK 8, StringBuffer class has a toStringCache , while StringBuilder doesn't. /** * A cache of the last value returned by toString. Cleared * whenever the StringBuffer is modified. */ private transient char[] toStringCache; But why? One possible reason I can think of is that StringBuffer is already synchronized so a cache can be implemented easier. Or maybe historically StringBuffer was implemented this way so old code depends heavily on this feature? Given modern JVM with escape analysis

Passing string buffer to java program in IntelliJ debug/run

由 依然范特西╮ 提交于 2019-12-06 18:36:30
问题 How does one accomplish equivalent of running following line on command line in IntelliJ or Eclipse .... : java MyJava < SomeTextFile.txt I've attempted to provide location of the file in Program Arguments field of Run/Debug Configuration in IntelliJ 回答1: As @Maba said we can not use Input redirection operator (any redirection operator) in eclipse/intellij as there no shell but you can simulate the input reading from a file through stdin like the below InputStream stdin = null; try { stdin =

String Vs Stringbuffer as HashMap key

由 自作多情 提交于 2019-12-05 21:22:23
I am trying to understand why String and Stringbuilder/StringBuffer are treated differently when used as Hashmap keys. Let me make my confusion clearer with the following illustrations: Example #1, using String: String s1 = new String("abc"); String s2 = new String("abc"); HashMap hm = new HashMap(); hm.put(s1, 1); hm.put(s2, 2); System.out.println(hm.size()); Above code snippet prints '1'. Example #2, using StringBuilder(or StringBuffer): StringBuilder sb1 = new StringBuilder("abc"); StringBuilder sb2 = new StringBuilder("abc"); HashMap hm = new HashMap(); hm.put(sb1, 1); hm.put(sb2, 2);

How does ensureCapacity work in Java?

由 痴心易碎 提交于 2019-12-05 18:57:36
StringBuffer buff1 = new StringBuffer("tuts point"); System.out.println("Old Capacity of buff1 = " + buff1.capacity()); buff1.ensureCapacity(28); System.out.println("New Capacity of buff1 = " + buff1.capacity()); StringBuffer buff2 = new StringBuffer("compilejksde"); System.out.println("Old Capacity of buff2= " + buff2.capacity()); buff2.ensureCapacity(75); System.out.println("New Capacity of buff2= " + buff2.capacity()); The contract states the following : Ensures that the capacity is at least equal to the specified minimum. If the current capacity is less than the argument, then a new
订阅 stringbuffer