What are the new features of java-11?

On September 2018, Oracle released a new version of Java as Java-11. Following are the new features of java-11.

Java 11 is Long term support (LTS) after java 8. Oracle stopped supporting Java 8 in January 2019. As a consequence, a lot of us will upgrade to Java 11.

We will explore new features, removed features, and performance enhancements introduced in Java 11.

  1. New String Methods: New methods are added to the String class.
  • isBlank(): This will check if the string is blank. It will return true if the string is blank.
  • strip(): This will Return a string whose value is this string, with all leading and trailing white space removed.
  • stripLeading(): Returns a string whose value is this string, with all leading white space removed.
  • stripTrailing(): Returns a string whose value is this string, with all trailing white space removed.
  • lines(): This will return a stream of lines extracted from this string, separated by line terminators.
  • repeat(): Returns a string whose value is the concatenation of this string repeated count times. If this string is empty or the count is zero then the empty string is returned.
import java.util.stream.Stream;
public class Test {
public static void main(String[] args) {
String str1 = “”, str2 = ” “, str3 = ” ab d “;

// 1. isBlank()
System.out.println(“—- 1. isBlank() —-“);
System.out.println(“str1 is blank: ” + str1.isBlank());
System.out.println(“str2 is blank: ” + str2.isBlank());
System.out.println(“str3 is blank: ” + str3.isBlank());

// 2. strip()
System.out.println(“—- 2. strip() —-“);
System.out.println(“str1.strip():-” + str1.strip()+”-:”); // blank
System.out.println(“str2.strip():-” + str2.strip()+”-:”); // blank
System.out.println(“str3.strip():-” + str3.strip()+”-:”); // ab d

// 3. stripLeading
System.out.println(“—- 3. stripLeading() —-“);
System.out.println(“str1.strip():-” + str1.stripLeading()+”-:”);
System.out.println(“str2.strip():-” + str2.stripLeading()+”-:”);
System.out.println(“str3.strip():-” + str3.stripLeading()+”-:”);

// 4. stripTrailing
System.out.println(“—- 4. stripTrailing() —-“);
System.out.println(“str1.strip():-” + str1.stripTrailing()+”-:”);
System.out.println(“str2.strip():-” + str2.stripTrailing()+”-:”);
System.out.println(“str3.strip():-” + str3.stripTrailing()+”-:”);

// 5. lines()
System.out.println(“—- 5. lines() —-“);
String str = “ugtworld \r test \n this is next line”;
Stream<String> lines = str.lines();
lines.forEach(a -> System.out.println(a.strip()));

// 6. repeat()
System.out.println(“—- 6. repeat() —-“);
String val = “ABCD”;
System.out.println(val.repeat(2));
}
}
Output:
—- 1. isBlank() —-
str1 is blank: true
str2 is blank: true
str3 is blank: false
—- 2. strip() —-
str1.strip():–:
str2.strip():–:
str3.strip():-ab d-:
—- 3. stripLeading() —-
str1.strip():–:
str2.strip():–:
str3.strip():-ab d -:
—- 4. stripTrailing() —-
str1.strip():–:
str2.strip():–:
str3.strip():- ab d-:
—- 5. lines() —-
ugtworld
test
this is next line
—- 6. repeat() —-
ABCDABCD

  1. New File Methods:
  • new readString() and writeString(), and isSameFile() methods are added to read, write and check if the file path is same.
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class Test {
public static void main(String[] args) throws IOException {
String path = “”;
File file1 = new File(“testfile.txt”); // testfile.txt will be created in current dir.
Path filePath = Paths.get(“”, “”, “testfile.txt”);

// 1. writeString() – to write
Files.writeString(filePath, “This is ugtworld.com”);

// 2. readString() – to read
String fileContent = Files.readString(filePath);
System.out.println(fileContent);

// 3. isSameFile() – to check whether two paths locate the same file or not.
System.out.println(Files.isSameFile(filePath, Path.of(“testfile.txt”)));
}
}
Output:
This is ugtworld.com
true

  1. Collection to an Array:
  • By using toArray() we can create an array from a collection object.
import java.util.ArrayList;
import java.util.List;

public class Test {
public static void main(String[] args) {
List<String> list = new ArrayList<>();
list.add(“DKS”);
list.add(“KJM”);
list.add(“KJD”);
list.add(“BBH”);
list.add(“PCY”);

String[] strArr = list.toArray(String[]::new);
System.out.println(strArr[3]+ “, ” + strArr[4]);
}
}
Output:
op
BBH, PCY

  1. var keyword for Lambda:
  • we can now use the var keyword inside the lambda function.
import javax.annotation.Nonnull;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;


public class Test {
public static void main(String[] args) {
List<String> list = new ArrayList<>();
list.add(“DKS”);
list.add(“KJM”);
list.add(“KJD”);
list.add(“BBH”);
list.add(“PCY”);

String resultString = list.stream()
.map((@Nonnull var x) -> x.toLowerCase())
.collect(Collectors.joining(“, “));
System.out.println(resultString);
}
}
Output:
dks, kjm, kjd, bbh, pcy

  1. not() method for Predicate: 
  • As shown below now we can perform the not operation on the predicate.
import javax.annotation.Nonnull;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Collectors;


public class Test {
public static void main(String[] args) {
List<Integer> list = Arrays.asList(23,54,21,34,56,43,26,98,57);
List<Integer> evenList = list.stream()
.filter(a -> a % 2 == 0)
.collect(Collectors.toList());
List<Integer> oddList = list.stream()
.filter(Predicate.not(a -> a % 2 == 0))
.collect(Collectors.toList());
System.out.println(“evenList: ” + evenList);
System.out.println(“oddList: ” + oddList);
}
}
Output:
evenList: [54, 34, 56, 26, 98]
oddList: [23, 21, 43, 57]

  1. Running Java Files: 
  • Previously we need to compile a java file with the ‘javac’ command and then run the file via the command line. 
  • From java 11 we can directly compile and run the file at same time as shown in below image.
  1. Pattern Recognizing Methods: 
  • asMatchPredicate(): This method is similar to Java 8 method asPredicate(). Introduced in JDK 11, this method will Create a predicate that tests if this pattern matches a given input string.
import java.util.function.Predicate;
import java.util.regex.Pattern;

public class Test {
public static void main(String[] args) {
String str = “ugtworld”;
Predicate t = Pattern.compile(str)
.asMatchPredicate();
System.out.println(t.test(“ugtworld”));
System.out.println(t.test(“ugt”));
}
}
Output:
true
false

  1. Epsilon(No-Op) Garbage Collector:
  • A new garbage collector called Epsilon is available for use in Java 11.
  • It’s called a No-Op (no operations) because it allocates memory but does not actually collect any garbage.
  • Hence Epsilon is applicable for simulating out of memory errors.
  • This can be useful for Performance testing, memory pressure testing, VM interface testing, and extremely short-lived jobs.
  1. TimeUnit Conversion
  • This is used to convert the given time to a unit like DAY, MONTH, YEAR, and for time.
import java.time.Duration;
import java.util.concurrent.TimeUnit;

public class Test {
public static void main(String[] args) {
System.out.println(“Days: ” + TimeUnit.DAYS.convert(Duration.ofHours(48)));
System.out.println(“Minutes: ” + TimeUnit.MINUTES.convert(Duration.ofHours(48)));
System.out.println(“Seconds: ” + TimeUnit.SECONDS.convert(Duration.ofHours(48)));
}
}
Output:
Days: 2
Minutes: 2880
Seconds: 172800

Removed Features and Options:

  • appletviewer Launcher
  • com.sun.awt.AWTUtilities Class
  • Java Deployment Technologies
  • JavaFX from the Oracle JDK
  • JEP 320 Remove the Java EE and CORBA Modules
  • JMC from the Oracle JDK
  • JVM-MANAGEMENT-MIB.mib
  • Lucida Fonts from Oracle JDK
  • Oracle JDK’s javax.imageio JPEG Plugin No Longer Supports Images with alpha
  • SNMP Agent
  • sun.locale.formatasdefault Property
  • sun.misc.Unsafe.defineClass
  • sun.nio.ch.disableSystemWideOverlappingFileLockCheck Property
  • Thread.destroy() and Thread.stop(Throwable) Methods

Deprecated Features and Options 

  • Deprecate -XX+AggressiveOpts
  • Deprecate Stream-Based GSSContext Methods
  • JEP 335 Deprecate the Nashorn JavaScript Engine
  • JEP 336 Deprecate the Pack200 Tools and API
  • Obsolete Support for Commercial Features
  • ThreadPoolExecutor Should Not Specify a Dependency on Finalization

-A blog by Shwetali Khambe

Click here to read all about Coding language Java
1Love
0Haha
0Shocked
0Sad
0Angry

Related Posts

Illustration in Fashion Design!
Blogs Career Opportunities English Blogs Fashion Design

Illustration in Fashion Design!

ugtworld
Draping in Fashion Design
Blogs Career Opportunities English Fashion Design Google Explore

Draping in Fashion Design

ugtworld