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Question about the Java documentation and its implementation


Question about the Java documentation and its implementation

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Question about the Java documentation and its implementation
Tag : java , By : user124112
Date : November 28 2020, 04:01 AM

like below fixes the issue Object[] is basically just an array of objects (best explanation award right here please ----> ☐ )
Jokes aside, in Java, any object is derived from the class Object so basically, this array can store any object of any class. It's mostly useful when you just want to carry an instance (or several instances) of different classes, but the type of said instance is not important.
Class Dog {
    String name;

    public Dog(String name) {
        this.name = name
    }

    public String toString() {
        return "Hello! I am a dog called " + this.name;
    }
}
Class Refrigerator {
    public Refrigerator() {
    }

    public String toString() {
        return "I am a refrigerator";
    }
}
Dog myDog = new Dog("Spike");
Object anyObject = myDog;
System.out.println(anyObject.toString());   //would print the result of your "toString()" method in the Dog class : 
                                            //"Hello! I am a dog called Spike"


Refrigerator myFridge = new Refrigerator();
Object secondObject = myFridge;
System.out.println(secondObject.toString());    //would print the result of your "toString()" method in the Refrigerator class : 
                                                //"I am a refrigerator"
public void printWhatYouAre(Object o) {
    System.out.println(o.toString());
}

public void doingSomething() {
    Dog myDog = new Dog("Spike");
    Refrigerator myFridge = new Refrigerator();

    printWhatYouAre(myDog);
    printWhatYouAre(myFridge); //would print the same as above
}

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Proof: why does java.lang.String.hashCode()'s implementation match its documentation?


Tag : java , By : UnKnownUser
Date : March 29 2020, 07:55 AM
Hope that helps I'm not sure if you missed where it says "^ indicates exponentiation" (not xor) in that documentation.
Each time through the loop, the previous value of hash is multipled by 31 again before being added to the next element of value.
hash = 0;
hash = 31 * hash + value[0];
hash = 31 * hash + value[1];
hash = 31 * hash + value[2];
hash = 31 * hash + value[3];
hash = 31 * (31 * (31 * (31 * 0 + value[0]) + value[1]) + value[2])
     + value[3];
hash = 31 * (31 * (31 * value[0] + value[1]) + value[2])
     + value[3];
hash = 31 * (31 * 31 * value[0] + 31 * value[1] + value[2])
     + value[3];
hash = 31 * 31 * 31 * value[0] + 31 * 31 * value[1] + 31 * value[2]
     + value[3];
hash = 31^3 * value[0] + 31^2 * value[1] + 31^1 * value[2] + value[3];

Question about LRU Cache implementation in Java


Tag : java , By : Mr. Tacos
Date : March 29 2020, 07:55 AM
With these it helps In this example, the LinkedHashMap is being extended with an "anonymous inner class".
The removeEldestEntry method is overriding the super-class's version, which always returns false (indicating the eldest entry should not be removed). The overriding version returns true if the size of the map exceeds the limit, indicating that the oldest entry should be removed.

Regarding Tree Implementation in Java - Question


Tag : java , By : Ryuken
Date : March 29 2020, 07:55 AM
To fix this issue Put all your Nodes in an arrayList, created by order. This algorithm assumes the get the table rows by order of PK_ID.
nodes = emptyArrayList

for each row in your table:
   node n = new Node(PK_ID)
   nodes.add(n)
   if (PARENT != null)
       nodes.get(PARENT).addChild(n)

Java design/implementation question


Tag : java , By : scotta01
Date : March 29 2020, 07:55 AM
I wish this help you I'm creating a small project which will manipulate some internal components of the project(big one). , I think you should create an Interface Deleteable with the method
public void delete()
public void delete(Deleteable obj) {
    obj.delete();
}

The correct place for class-implementation documentation notes in Java


Tag : java , By : Jonathan
Date : March 29 2020, 07:55 AM
With these it helps You can always write the implementation notes as a non-javadoc comment block / header before your class declaration, typically:
package com.example;

import x.y.z.SomeClass;

/* non-javadoc (single asterisk)
Implementation notes:
  - something
  - something else
*/

/** javadoc (double asterisk)
 * Description for consumers of the class
 * @author someone
 */
public class MyClass {
  ...
}
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