Java 11- New Methods of String Class

By Atul Rai | Last Updated: June 16, 2022 Previous       Next

Java 11 (JDK 11) added a few new utility methods in the String class. These utility methods will reduce the complexity of the program and improve code readability and performance.

1. repeat(int count)
2. isBlank()
3. strip()
4. stripLeading()
5. stripTrailing()
6. lines()

1. repeat(int count)

repeate(int count) method repeats the string ‘n’ times (concatenate the string) and returns a string composed of this string repeated ‘n’ times. It will throw IllegalArgumentException if the count is negative.

String str1 = "Atul Rai";
String result1 = str1.repeat(5);
System.out.println(result1);

Output:

Atul RaiAtul RaiAtul RaiAtul RaiAtul Rai

2. isBlank()

isBlank() method returns true if a string is empty or only contains white space otherwise returns false.

String str2 = "";
System.out.println(str2.isBlank());

String str3 = "    ";
System.out.println(str3.isBlank());

String str4 = "  Atul  ";
System.out.println(str4.isBlank());

Output:

true
true
false

3. strip()

The strip() method removed all the leading and trailing white space and return a new composed string.

String str5 = "\t    Manish    \u2005";
System.out.println(str5.strip());

Output:

Manish

4. stripLeading()

stringLeading() method returns a string whose value is this string, with all leading white space removed.

String str6 = "\t    Manish    \u2005";
System.out.println(str6.stripLeading());

Output:

Manish     #

5. stripTrailing()

Returns a string whose value is this string, with all trailing white space removed.

String str7 = "\t    Manish    \u2005";
System.out.println(str7.stripTrailing());

Output:

	    Manish

6. lines()

lines() method returns a stream of lines extracted from this string, separated by line terminators such as \r, \n.

String str8 = "Hello I'm Atul Rai.\nI work for a MNC as SSE.\rAnd live in Sydney, Australia.";
long lineCount = str8.lines().count();
System.out.println("No of lines: " + lineCount);
List<String> lines = str8.lines().collect(Collectors.toList());
System.out.println(lines);

Output:

No of lines: 3
[Hello I'm Atul Rai., I work for a MNC as SSE., And live in Sydney, Australia.]

References

1. String (Java SE 11 & JDK 11 )