I want to display a Unicode character in Java. If I do this, it works just fine: String symbol = “u2202”; symbol is equal to “∂”. That’s what I want. The problem is that I know the Unicode …
Tag: string
How can I count the number of occurrences of a simple pattern in a string?
For this question, a “pair” in a string is defined as a situation where two instances of one character are separated by another character. So in “AxA” the A’s make a pair. Pairs can overlap, so “AxAxA”…
How can i sort a string without using sort() method in java?
I want to sort a string “computer” -> “cemoprtu”, but without using Arrays.sort(string). Answer Looks like you need to sort the characters, so I’d start with
Set running time limit on a method in java
I have a method that returns a String. Is it possible that after a certain time, if threshold is excedeed for that method, to return some specific string? Answer The Guava library has a very nice TimeLimiter that lets you do this on any method that’s defined by an interface. It can generate a proxy for your object that has
How do I remove some characters from my String
i want to remove all of the following chars from my string “>[],-” at the moment im doing this. but there must be a more efficient way newString = myString.replace(“>”,””).replace(“[“,””)….
Ultra-fast “Begins With” Query from Disk
I have a 40MB (too big for memory in this case) list of strings that I want to do “begins with” queries on to extract matches. Anyone know of a good data structure for this? Bonus points for an existing os java implementation. I would be willing to sacrifice “begins with” to just exact matching if something already exists. A
Remove all empty lines
I thought that wasn’t that hard to do, but I want to remove all empty lines (or lines just containing blanks and tabs in Java) with String.replaceAll. My regex looks like this: But it doesn’t work. I looked around, but only found regexes for removing empty lines without blanks or tabs. Answer Try this: Note that the regex [ |t]
How can I find whitespace in a String?
How can I check to see if a String contains a whitespace character, an empty space or ” “. If possible, please provide a Java example. For example: String = “test word”; Answer For checking if a string contains whitespace use a Matcher and call its find method. If you want to check if it only consists of whitespace then
Search for a word in a String
If I am looking for a particular word inside a string, for example, in the string “how are you” I am looking for “are”. Would a regular indexOf() work faster and better or a Regex match() Which of the two methods above is a better way of looking for a string inside another string? Or is there a much better
How to shuffle characters in a string without using Collections.shuffle(…)?
How do I shuffle the characters in a string (e.g. hello could be ehlol or lleoh or …). I don’t want to use the Collections.shuffle(…) method, is there anything simpler? Answer I dont know anything simpler. But you can use the Math.rand() functionality to generate a random number within the range of the character’s length without replace and that would