logo
down
shadow

Adding Java final keyword to working method that builds instances inside a loop


Adding Java final keyword to working method that builds instances inside a loop

By : Irma Pees
Date : October 21 2020, 08:10 PM
Hope this helps To expand on my comment, you could convert your example code more or less mechanically, like so:
code :
public List<Widget> compriseWidgets(final List<Fidget> fidgetList) {
    final List<Widget> widgets = new ArrayList<Widget>();
    final Widget[] currentWidget = new Widget[] {null};

    for (final Fidget fidget : fidgetList) {
        if (currentWidget[0] == null || 
                !currentWidget[0].getFizz().equals(fidget.getFizz())) {

            currentWidget[0] = new Widget();
            widgets.add(currentWidget);
            currentWidget.setFizz(fidget.getFizz());
            currentWidget.setBuzz(fidget.getFoo().length());
        }

        currentWidget.getCollaborators().add(fidget);
    }

    return widgets;
}
public List<Widget> compriseWidgets(final List<Fidget> fidgetList) {
    final List<Widget> widgets = new ArrayList<Widget>();
    final ListIterator<Fidget> fidgets = fidgetList.listIterator();

    while (addWidget(widgets, fidgets)) { /* empty */ }

    return widgets;
}    

private boolean addWidget(final List<Widget> widgets, final ListIterator<Fidget> fidgets) {
    if (fidgets.hasNext()) {
        final Fidget firstFidget = fidgets.next();
        final Widget currentWidget = new Widget();

        widgets.add(currentWidget);
        currentWidget.setFizz(firstFidget.getFizz());
        currentWidget.setBuzz(firstFidget.getFoo().length());
        currentWidget.getCollaborators().add(firstFidget);

        while (fidgets.hasNext()) {
            final nextFidget = fidgets.next();

            if (currentWidget.getFizz().equals(nextFidget.getFizz())) {
                currentWidget.getCollaborators().add(nextFidget);
            } else {
                fidgets.previous();
                return true;
            }
        }
    }

    return false;
}


Share : facebook icon twitter icon
Java - Is there Java equivalent for C# new keyword in method signature? How I can replace final methods in Java?

Java - Is there Java equivalent for C# new keyword in method signature? How I can replace final methods in Java?


By : Tadej Anclin
Date : March 29 2020, 07:55 AM
I hope this helps . As you maybe know, as Java language perspective all method in C# are final by default (also vice versa, all methods in Java are virtual as C# language perspective). , You cannot replace final methods in Java.
Java using final keyword inside a method

Java using final keyword inside a method


By : RaviB
Date : March 29 2020, 07:55 AM
hop of those help? In Java, the keyword final is used to indicate that the variable cannot be reassigned. If that is the case, why can't a variable declared inside a method have the final keyword? Why is this not legal: , You can.
code :
public void foo() {
    final String bar = "bar";
}
Declaring class inside a method - Final keyword

Declaring class inside a method - Final keyword


By : Jijo Alexander
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , The difference is between local variables vs class member variables. A member variable exists during the lifetime of the enclosing object, so it can be referenced by the inner class instance. A local variable, however, exists only during the method invocation, and is handled differently by the compiler, in that an implicit copy of it is generated as the member of the inner class. Without declaring the local variable final, one could change it, leading to subtle errors due to the inner class still referring to the original value of that variable.
Final local variables
code :
public class Access1 {
  public void f() {
    final int i = 3;
    Runnable runnable = new Runnable() {
    public void run() {
      System.out.println(i);
    }
    };
  }
}
public class Access1 {
  public Access1() {}
  public void f() {
    Access1$1 access1$1 = new Access1$1(this);
  }
}
class Access1$1 implements Runnable {
  Access1$1(Access1 access1) {
    this$0 = access1;
  }
  public void run() {
    System.out.println(3);
  }
  private final Access1 this$0;
}
public class Access2 {
  public void f() {
    for (int i=0; i<10; i++) {
    final int value = i;
    Runnable runnable = new Runnable() {
      public void run() {
        System.out.println(value);
      }
    };
    }
  }
} 
public class Access3 {
  public void f() {
    Runnable[] runners = new Runnable[10];
    for (final int[] i={0}; i[0]<runners.length; i[0]++) {
    runners[i[0]] = new Runnable() {
      private int counter = i[0];
      public void run() {
        System.out.println(counter);
      }
    };
    }
    for (int i=0; i<runners.length; i++)
    runners[i].run();
  }
  public static void main(String[] args) {
    new Access3().f();
  }
}
Final keyword in java allowing changes in a method

Final keyword in java allowing changes in a method


By : hubery.x.song
Date : March 29 2020, 07:55 AM
this one helps. You aren't changing the static final num variable; you are changing the local copy of it in manipulate's num parameter local variable. When you print num back in main, it will still be 5.
Adding a final keyword in the java main method parameter doesn't give any compile error / exception?

Adding a final keyword in the java main method parameter doesn't give any compile error / exception?


By : vinay
Date : March 29 2020, 07:55 AM
I wish this helpful for you final marks the reference as constant, it doesn't actually change the type. Also note changing the signature of main is never a compiler error, but it can frequently cause a runtime error.
Related Posts Related Posts :
  • Interrupt CompletableFuture with default value
  • Eclipse - Choosing servers in "Run on server" vs setting "Target Runtime"
  • Spring JPA doesn't validate bean on update
  • How is takeWhile different from filter?
  • Spring Scheduled Cron jobs firing at wrong time
  • JFrame window resizing on every compile. Different results every time
  • Kotlin unresolved reference :add after converting from Java code
  • How to use Neo4j APOC method " apoc.export.csv.query(query,file,config)" in Java program
  • Regex to include all spanish characters and number
  • Parsing and Mapping a JSON Object with Dynamic Properties
  • Which approach to building domain objects in Spring MVC is more correct?
  • Java Long Min and Max not exact as mentioned in docs
  • Selenium opens new tab after SendKeys
  • How to sort a large array of ints?
  • FitNessse Test can not find Fixture
  • Including Signed Libraries in Executable JAR with Maven
  • If and Else statement run on second iteration of while loop
  • Change class of disabled tab on change of dropdown value
  • Junit5 @ParameterizedTest How to pass array as one of parameter
  • Text message not being sent to a list of numbers but is sent when just one number is specified
  • Spring mapped servlet not called in jetty-maven-plugin
  • How to pace the consumption of a sqs queue using spring integration
  • Autowiring Not getting disabled using xml configuration
  • Maze solve and shortest path with Java BFS
  • Spinner updating only on user actions
  • Why are Java rules for protected access such as they are?
  • Modify parameter of method by value in annotation aspectJ
  • How to send sensitive data to a Liferay portlet from outside the Liferay portal
  • Does a server connection stay open if created inside a method?
  • JAR manifest Class-Path, use folder instead of jar
  • How to do a bulk update in Firestore
  • ItemArray.checklist.add() not appending string to ArrayList
  • How to move something on screen without other picture staying there
  • SpringBoot : No matching bean found exception
  • Implementing the Clonable interface, but don't have to override the clone() method
  • how can i get this code to choose a random word once from each array to print a sentence?
  • Static class to get connections from connection pool
  • Unable to start Chrome browser with user profile in Selenium
  • How to pass a object to be created as a parameter for a method in Java?
  • How to retry with hystrix
  • Loading key to KeyStore fails on Android Oreo
  • Spring+Velocity unsuccessful attempts to save object
  • Private constructor in Kotlin
  • Jetty:run fails with NoSuchMethodError with Spring 5
  • Cannot upload my Web Applicartion in Jboss7 EAP7 EAP
  • How to load a certificate from "Credential storage"?
  • Call Genexus procedure stub in Java environment
  • JavaFX clipping produces a 'lottery scratch ticket'-Effect
  • Using DateTimeFormatter on january first cause an invalid year value
  • Get all the output from Watson conversation using java
  • Java unable to open main class and jar file
  • How to override @override method from activity into another class
  • Adding Runtime VM parameters to intellij for Java 9
  • Java IBM MQ Client connected but not getting messages from queue
  • Questions of Tomcat SSL configuration
  • Stale JNLP files for <extension> (since Java 9?)
  • Properly set (system) properties in JUnit 5
  • Spring MVC Model within POST Method is empty
  • VSTS buildagent: Java 9
  • java.lang.NumberFormatException: For input string: "id" for Hibernate
  • shadow
    Privacy Policy - Terms - Contact Us © voile276.org