This topic is about Java 12 – String methods.
Java 12 introduces following new methods to String for easy formatting.
indent(n) method
Adjust the indention of each line of string based on argument passed.
Usage
string.indent(n)
- n > 0 – insert space at the begining of each line.
- n < 0 – remove space at the begining of each line.
- n < 0 and n < available spaces – remove all leading space of each line.
- n = 0 – no change.
transform(Function<? super String,? extends R> f) method
Transforms a string to give result as R.
Usage
String transformed = text.transform(value -> new StringBuilder(value).reverse().toString());
Optional<String> describeConstable() method
Returns Optional Object containing description of String instance.
Usage
Optional<String> optional = message.describeConstable();
resolveConstantDesc(MethodHandles.Lookup lookup) method
Returns descriptor instance string of given string.
Usage
String constantDesc = message.resolveConstantDesc(MethodHandles.lookup());
Consider the following example −
ApiTester.java
import java.lang.invoke.MethodHandles;
import java.util.Optional;
public class APITester {
public static void main(String[] args) {
String str = "Welcome \nto Adglob!";
System.out.println(str.indent(0));
System.out.println(str.indent(3));
String text = "Java";
String transformed = text.transform(value -> new StringBuilder(value).reverse().toString());
System.out.println(transformed);
Optional<String> optional = text.describeConstable();
System.out.println(optional);
String cDescription = text.resolveConstantDesc(MethodHandles.lookup());
System.out.println(cDescription);
}
}
Output
Welcome to Adglob! Welcome to Adglob! avaJ Optional[Java] Java
To know more, Click Here.
Pingback: Java 12 - Teeing Collectors - Adglob Infosystem Pvt Ltd