Tuesday, 16 May 2017

Java Tutorial: Generics in java | Java Generics [Generic method - order pair]


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Java Tutorial: Generics in java | Java Generics [Generic method - order pair]
OrderPair.java
public class OrderPair<K, V>
{

    private K key;
    private V value;

    public OrderPair(K key, V value)
    {
        this.key = key;
        this.value = value;
    }

    public void setKey(K key)
    {
        this.key = key;
    }

    public void setValue(V value)
    {
        this.value = value;
    }

    public K getKey()
    {
        return key;
    }

    public V getValue()
    {
        return value;
    }
}
GenericDemo.java
public class GenericDemo
{

    public static void main(String[] args)
    {
        OrderPair<Integer, String> p1 = new OrderPair<Integer, String>(1, "apple");
        OrderPair<Integer, String> p2 = new OrderPair<Integer, String>(1, "apple");
        boolean same = GenericDemo.compare(p1, p2);
        
        //Like below also we can invoke. 
        //boolean same = GenericDemo.<Integer, String>compare(p1, p2);
        System.out.println("is p1 and p2 are same? = " + same);

    }

    public static <K, V> boolean compare(OrderPair<K, V> p1,
                                                    OrderPair<K, V> p2)
    {
        return p1.getKey().equals(p2.getKey())
                && p1.getValue().equals(p2.getValue());
    }

}
Output
is p1 and p2 are same? = true
Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/GenericsMethodDemo_OP_App.zip?attredirects=0&d=1

Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/GenericsMethodDemo_OP_App

Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/539015917c8406e4be671410d713073b3971d1a5/BasicJava/GenericsMethodDemo_OP_App/?at=master

See also:
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  • Servlets Tutorial
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  • JDBC Tutorial
  • Java Collection Framework Tutorial
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