JAVA EE: Java Tutorial: Generics in java | Java Generics [Generic method

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());
    }

}