JAVA 11 – New String
methods
In this blog, we will discuss about
all six new methods which got introduced with JDK 11.
- isBlank(): returns true if string is empty otherwise false. White spaces code will also be considered as empty string.
// Java 8
Predefine Functional Interface
// The best
way to learn JAVA 8 is to implement it wherever you can...
BiConsumer<String, String> display = (msg1, msg2) ->
System.out.println(msg1 + msg2);
// local variable
type inference
var msg = "Welcome to waheedtechblog page";
// String msg
= "Welcome to waheedtechblog page"; both are same
// Will
return true if string is empty or any white spaces
if (msg.isBlank())
{
display.accept("msg attribute is emty", msg);
} else {
display.accept("1. Hello, ", msg);
}
String emptyMsg = "";
display.accept("2. Is msg Empty: ", String.valueOf(emptyMsg.isBlank()));
String whitespacesMsg = "\n\t";
display.accept("2.
Is msg empty: ", String.valueOf(whitespacesMsg.isBlank()));
Output:
1. Hello, Welcome to waheedtechblog page
2. Is msg Empty: true
3.
Is msg empty: true
- lines(): This method returns a stream of lines extracted from the string, separated by line terminators such as \n, \r etc.
String lineMsg = "Welcome\nto\nwaheedtechblog\npage";
display.accept("3. Line Msg: \n", lineMsg);
// line
returns streams of line extracted from the String
List<String> lines = lineMsg.lines().collect(Collectors.toList());
System.out.println("4.
line as list: " + lines);
Output:
3. Line Msg:
Welcome
to
waheedtechblog
page
4.
line as list: [Welcome, to, waheedtechblog, page]
- repeat(n):
This method returns the concatenated string of original string repeated the
number of times in the argument.
var repeatMessage = "Welcome";
// returns a new string whose
value is the concatenation of this string repeated
// ‘n’ times.
display.accept("9.
Repeat msg: ", repeatMessage.repeat(5));
Output:
9.
Repeat msg: WelcomeWelcomeWelcomeWelcomeWelcome
- Strip(),
StripLeading(),StripTrailing(): These
method are used to strip white spaces from the String
var stripMsg = " Welcome to
\t Waheedtechblog page ";
display.accept("5. Normal Print: ", "$" + stripMsg + " $");
// As the name suggests, Strip() methods are used to strip whitespaces
from the
// string.
display.accept("6. Using Strip(): ", "$" + stripMsg.strip() + "$");
display.accept("7. Using StripLeading(): ", "$" + stripMsg.stripLeading() + "$");
display.accept("8. Using StripTrailing: ", "$" + stripMsg.stripTrailing() + "$");
Output:
5. Normal Print: $
Welcome to Waheedtechblog page $
6. Using Strip(): $Welcome to
Waheedtechblog page$
7. Using StripLeading(): $Welcome to Waheedtechblog page $
8.
Using StripTrailing: $ Welcome to Waheedtechblog page$
You can download the source code from my
GitHub repository.
Happy Coding…!!!
