To access the first n characters of a string in Java, we can use the built-in substring() method by passing 0, n as an arguments to it. 0 is the first character index (that is start position), n is the number of characters we need to get from a string. Note: The extraction starts at index 0 and ends before index 3.
slice() method to get the first N characters of a string, e.g. str. slice(0, 3) . The slice() method takes the start and stop indexes as parameters and returns a new string containing a slice of the original string.
string str = (yourStringVariable + " "). Substring(0,5). Trim();
Use the charAt() method to get the nth character in a string, e.g. str. charAt(1) gets the second character in the string. The only parameter the charAt method takes is the index of the character to be returned. If the index does not exist in the string, an empty string is returned.
public static string TruncateLongString(this string str, int maxLength)
{
if (string.IsNullOrEmpty(str)) return str;
return str.Substring(0, Math.Min(str.Length, maxLength));
}
In C# 8 or later it is also possible to use a Range to make this a bit terser:
public static string TruncateLongString(this string str, int maxLength)
{
return str?[0..Math.Min(str.Length, maxLength)];
}
Which can be further reduced using an expression body:
public static string TruncateLongString(this string str, int maxLength) =>
str?[0..Math.Min(str.Length, maxLength)];
Note null-conditional operator (?
) is there to handle the case where str
is null. This replaces the need for an explict null check.
string truncatedToNLength = new string(s.Take(n).ToArray());
This solution has a tiny bonus in that if n is greater than s.Length, it still does the right thing.
You can use LINQ str.Take(n)
or str.SubString(0, n)
, where the latter will throw an ArgumentOutOfRangeException
exception for n > str.Length
.
Mind that the LINQ version returns a IEnumerable<char>
, so you'd have to convert the IEnumerable<char>
to string
: new string(s.Take(n).ToArray())
.
Whenever I have to do string manipulations in C#, I miss the good old Left
and Right
functions from Visual Basic, which are much simpler to use than Substring
.
So in most of my C# projects, I create extension methods for them:
public static class StringExtensions
{
public static string Left(this string str, int length)
{
return str.Substring(0, Math.Min(length, str.Length));
}
public static string Right(this string str, int length)
{
return str.Substring(str.Length - Math.Min(length, str.Length));
}
}
Note:
The Math.Min
part is there because Substring
throws an ArgumentOutOfRangeException
when the input string's length is smaller than the requested length, as already mentioned in some comments under previous answers.
string longString = "Long String";
// returns "Long";
string left1 = longString.Left(4);
// returns "Long String";
string left2 = longString.Left(100);
Simply:
public static String Truncate(String input,int maxLength)
{
if(input.Length > maxLength)
return input.Substring(0,maxLength);
return input;
}
public static string TruncateLongString(this string str, int maxLength)
{
return str.Length <= maxLength ? str : str.Remove(maxLength);
}
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