JAVA EE: Java Tutorial: Generics in java [How to define a Generic method which accepts user-defined class]

Tuesday 16 May 2017

Java Tutorial: Generics in java [How to define a Generic method which accepts user-defined class]

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https://www.youtube.com/watch?v=iDFnRvIwzUI&list=UUhwKlOVR041tngjerWxVccw

Bird.java

public class Bird
{
    private String birdName;

    public String getBirdName()
    {
        return birdName;
    }

    public void setBirdName(String birdName)
    {
        this.birdName = birdName;
    }

}

Employee.java

public class Employee
{
    private String name;

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

}

GenericDemo.java

public class GenericDemo
{
    public static void main(String[] args)
            throws IllegalAccessException, InstantiationException
    {

        Bird bird = getInstance(Bird.class);
        System.out.println(bird);

        Employee employee = getInstance(Employee.class);
        System.out.println(employee);

    }

    /*
     * Class objects can be used as type specifications too, at runtime.
     */
    public static <T> T getInstance(Class<T> theClass)
            throws IllegalAccessException, InstantiationException
    {

        return theClass.newInstance();
    }
}