logo
down
shadow

Why can't we just use arrays instead of varargs?


Why can't we just use arrays instead of varargs?

By : user2948373
Date : November 14 2020, 04:51 PM
may help you . I just came across varargs while learning android(doInBackground(Type... params)) ,SO posts clarified the use of it , The only difference between
code :
foo(String... strings)
foo(String[] strings)
foo("a", "b");
for(new String[] { "a", "b" }); // Valid for either declaration


Share : facebook icon twitter icon
Why are varargs and arrays sometimes incompatible?

Why are varargs and arrays sometimes incompatible?


By : user6321804
Date : March 29 2020, 07:55 AM
may help you . there is a method like this:
code :
class Test
{
void go()
{
    foo("first", "second", "third", new String []{"hello", "world"});

}
 void foo(String first, final String second, final String third, final String... headers) {}

}
Overloading varargs arrays, choosing method

Overloading varargs arrays, choosing method


By : eleanor66
Date : March 29 2020, 07:55 AM
With these it helps This is basically compiler deciding to call the most specific method among all.
When you call
code :
System.out.println(foo(i));//Object[]... vs Integer[]...
   //Object... vs Integer[]...
    public static String bar(Object args) {

        return "Object args";
    }

    public static String bar(Integer[] args) {
        return "Integer[] args";
    }
Casting object arrays in varargs

Casting object arrays in varargs


By : manokara
Date : March 29 2020, 07:55 AM
will help you Assuming that Rectangle class implements Relatable interface and that Rectangle class has move(int x, int y) method, you get ClassCastException because you cannot treat an array of Relatable as an array of Rectangle even though Rectangle implements an Relatable. Java arrays are covariant, that means it is allowed to do stuff like that:
code :
public class A {...}
public class B extends A{...}
A[] array = new B[2];
public static void moveAll( int x, int y, Relatable... obj) {

    for(Relatable r: obj){
        ((Rectangle)r).move(x, y);
    }

}
public interface Relatable {
    public static void moveAll( int x, int y, Relatable... obj) {

        for(Relatable r: obj){
            r.move(x, y);
        }

    }

    public void move(int x, int y);

}
How to pass two arrays into one varargs

How to pass two arrays into one varargs


By : DennisVD
Date : March 29 2020, 07:55 AM
Hope that helps Sadly not possible in java as there is no spread operator (like in Kotlin, Ecmascript 6). You have to work your way around this by creating an intermediate array:
code :
String arrayThree = new String[arrayOne.length + arrayTwo.length];
System.arraycopy(arrayOne, 0, arrayThree, 0, arrayOne.length);
System.arraycopy(arrayTwo, 0, arrayThree, arrayOne.length, arrayTwo.length);

doSomething(arrayThree);
String arrayThree = Stream.concat(Arrays.stream(arrayOne), Arrays.stream(arrayTwo))
                          .toArray(String[]::new);
doSomething(arrayThree);
val arrayOne: Array<String> = ...
val arrayTwo: Array<String> = ...

doSomething(*arrayOne, *arrayTwo)
const arrayOne = ...
const arrayTwo = ...

doSomething([...arrayOne, ...arrayTwo]);
Java varargs with 2-dimensional arrays

Java varargs with 2-dimensional arrays


By : MOHIT OJHA
Date : March 29 2020, 07:55 AM
hop of those help? The following works for me. Perhaps you're not doing what you think you're doing?
Related Posts Related Posts :
  • Passing HttpServletResponse in Spring Boot controller method
  • Failed to load libraries: [netty_tcnative_linux_arm_32, netty_tcnative_linux_arm_32_fedora, netty_tcnative_arm_32, netty
  • How to build a small documents storage?
  • Getting pixel position of a text in an image
  • How do I get a list of Methods called from a Class in Eclipse IDE?
  • Convert string to day of week (not exact date)
  • Unable to understand how rounding is working for decimal digits (Java)
  • How to avoid java.lang.NoSuchMethodError: org.apache.poi.util.IOUtils.copy(Ljava/io/InputStream;Ljava/io/OutputStream;)
  • JTable Renderer not working with RowSorter?
  • From java.util.concurrent.Future<T> to play.libs.F.Promise<T>: How to do that in Java?
  • jUnit tests work in Eclipse, but fail in ant - java.lang.RuntimeException: Stub
  • How do i add a tooltip to existing gwt Textbox?
  • actor replying to non-actor
  • Google Cloud Messaging - server connection
  • Which classes are unmodifiable and cannot be intrumented and is there a way to bypass it?
  • Java & Jersey 1.17: Custom default response headers
  • Java rounding error
  • Setting custom RejectedExecutionHandler for ThreadPoolExecutor after executing some tasks?
  • Arquillian test class variables lose value
  • java.util.ConcurrentModificationException while inserting in ArrayList
  • How to write generic Java API without method Overloading
  • Java Serialization / Deserialization of an ArrayList works only on first program execution
  • Conway's Game of Life's rules dont apply properly
  • call a java method when Click on a html button without using javascript
  • Why does SSLSocketFactory.createSocket returns a Socket instead of SSLSocket?
  • How to schedule a task in Tomcat
  • compare two pdf files (approach) using java
  • What is the use of allowCoreThreadTimeout( ) in ThreadPoolExecutor?
  • Describe the Strategy Design Pattern in Java?
  • MongoDB too many open connections
  • Issue with generate JAXB classes with value constructors
  • Moving from one frame to another in java swing
  • Get a thread by Id
  • how to open front camera and back camera at same time?
  • Messed up with Java Declaration
  • Extracting chart in EXcel as image using java
  • How to get latitude and longitude in Android phone?
  • Do GC pauses and kill -STOP produce the same behavior?
  • Android HTML.ImageGetter Images resized
  • The way to instantiate map<String, List<String>> in Java
  • Java Making objects move while buttons held
  • Androidx Navigation View - `setNavigationItemSelectedListener` Doesn't Work
  • after compiling code JFrame does not appear
  • Netbeans project, JFrames ran from the main JFrame close all JFrames in project
  • Square Retrofit Client: How to enable/disable followRedirects? How to intercept redirect URL?
  • Java Circular Reference - Can’t Compile
  • Mouse click on specific time JAVA
  • android 4 onCreateDialog return type incompatible when overriding
  • Java Implementation of Oracle's DBMS_UTILITY.GET_HASH_VALUE Function
  • javac cannot be run, and furthermore does not seem installed
  • Function to obtain a thread given its ID
  • Java File path to Executable has spaces
  • Minimum Oracle Java VM heap memory setting?
  • Elegant way to create one of a large number of classes
  • Java fx binding styles
  • Summing weights based on string in large file
  • Android ListView setOnItemClickListener not working
  • How is the Java Bootstrap Classloader loaded?
  • Check object is blank
  • Add image between text in JEditorPane
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org