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java generics type

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Terrible Toad answered on October 31, 2020 Popularity 10/10 Helpfulness 3/10

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java generics type

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Java Generic Type Naming convention helps us understanding code easily and having a naming convention is one of the best practices of Java programming language. So generics also comes with its own naming conventions. Usually, type parameter names are single, uppercase letters to make it easily distinguishable from java variables. The most commonly used type parameter names are:

E – Element (used extensively by the Java Collections Framework, for example ArrayList, Set etc.)
K – Key (Used in Map)
N – Number
T – Type
V – Value (Used in Map)
S,U,V etc. – 2nd, 3rd, 4th types

Popularity 10/10 Helpfulness 3/10 Language java

Source: Grepper

Tags: generics java

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Contributed on Dec 06 2020

Terrible Toad

0 Answers Avg Quality 2/10

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// generic methods

public <T> List<T> fromArrayToList(T[] a) {   
	    return Arrays.stream(a).collect(Collectors.toList());
	}

public static <T, G> List<G> fromArrayToList(T[] a, Function<T, G> mapperFunction) {
	    return Arrays.stream(a)
	      .map(mapperFunction)
	      .collect(Collectors.toList());
	}

// bounded generics

public <T extends Number> List<T> fromArrayToList(T[] a) {
	    ...
	}

//multiple bounds

<T extends Number & Comparable>

// upper bound wildcards

public static void paintAllBuildings(List<? extends Building> buildings) {
	    ...
	}
    
// lower bound wildcard

<? super T>

Popularity 10/10 Helpfulness 2/10 Language java

Source: www.baeldung.com

Tags: generics generic

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Contributed on Oct 31 2020

DevPedrada

0 Answers Avg Quality 2/10

java generics

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public class Tuple <T> {
  // the T is a placeholder for any datatype
  public T leftValue;
  public T rightValue;
  
  public Tuple(T leftValue, T rightValue){
    // again, T is being used as a placeholder for any type
    this.leftValue = leftValue;
    this.rightValue = rightValue;
}

public class Program{
  public static void main (String args){
    // And upon using Tuples we can fill in the T from the Tuple class with actual datatypes
    Tuple <int> intTuple = new Tuple <int>(5, 500)
    Tuple <String> stringTuple = new Tuple <String> ("Hello", "World")

    // we can even put Tuples inside of Tuples!
    Tuple<Tuple<int>> metaIntTuple = new Tuple <Tuple <int>> (intTuple, new Tuple <int> (456, 0));
  }
}

Popularity 10/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: generics generic

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Contributed on Jan 27 2021

Abstraction Mage

0 Answers Avg Quality 2/10

generics in java

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public <T> List<T> fromArrayToList(T[] a) {   
    return Arrays.stream(a).collect(Collectors.toList());
}

Popularity 10/10 Helpfulness 2/10 Language java

Source: Grepper

Tags: generics generic

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Contributed on May 07 2022

Modern Macaque

0 Answers Avg Quality 2/10

java generics

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// Generic interface
interface BoxInterface<T> {
    void setValue(T value);
    T getValue();
}

// Generic class implementing the BoxInterface with T
class Box<T> implements BoxInterface<T> {
    private T value;

    @Override
    public void setValue(T value) {
        this.value = value;
    }

    @Override
    public T getValue() {
        return value;
    }
}

public class Main {
    public static void main(String[] args) {
        // Using T 
        Box<String> stringBox = new Box<>();
        stringBox.setValue("Hello, Generics!");
        String stringValue = stringBox.getValue();

        // Using ? (wildcard) with Interface
        BoxInterface<?> wildcardBox = stringBox;
        // wildcardBox.setValue("This won't compile"); // We cannot set value of unknown type
        Object wildcardValue = wildcardBox.getValue(); // We can only cast value to Object type

        // Using ? extends T (upper bounded wildcard) with Interface
        // Focus type : the type on the right side of extend
        BoxInterface<? extends String> upperBoundedWildcardBox = stringBox;
        // upperBoundedWildcardBox.setValue("This won't compile"); // We cannot set value of unknown type
        String upperBoundedWildcardValue = upperBoundedWildcardBox.getValue(); // We can only cast value to Parent type, String in this case

        // Using ? super T (loower bounded wildcard) with Interface
        // Focus type : the type on the left side of super
        BoxInterface<? super String> lowerBoundedWildcardBox = new Box<>();
        lowerBoundedWildcardBox.setValue("Lower Bounded Wildcard");  // We can set value to parent type, String in this case
        Object lowerBoundedWildcardValue = lowerBoundedWildcardBox.getValue(); // We can only cast value to Parent type, Object in this case
    }
}

Popularity 8/10 Helpfulness 1/10 Language java

Source: Grepper

Tags: generics generic

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Contributed on Dec 22 2023

Innocent Iguana

0 Answers Avg Quality 2/10

java generics example

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public class Box<T> {
    private T content;
    
    public void setContent(T content) {
        this.content = content;
    }
    
    public T getContent() {
        return content;
    }
}

Popularity 7/10 Helpfulness 1/10 Language java

Source: chat.openai.com

Tags: generics java

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Contributed on Feb 19 2024

Hilarious Herring

0 Answers Avg Quality 2/10

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