JAVA EE: Java Tutorial: Generics in java | Java Generics [Generic types]

Monday 15 May 2017

Java Tutorial: Generics in java | Java Generics [Generic types]

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Java Tutorial: Generics in java | Java Generics [Generic types]

Box.java

/**
 * Generic version of the Box class.
 * 
 * @param <T>
 *            the type of the value being boxed
 */
public class Box<T>
{
    // T stands for "Type"
    private T t;

    public void set(T t)
    {
        this.t = t;
    }

    public T get()
    {
        return t;
    }
}

GenericDemo.java

public class GenericDemo
{

    public static void main(String[] args)
    {
        Box<Integer> integerBox = new Box<Integer>();
        integerBox.set(new Integer(100));
        //integerBox.set("Ram"); //Compile time error
        Integer integerValue = integerBox.get();
        System.out.println("integerValue = "+integerValue);

        Box<String> stringBox = new Box<String>();
        stringBox.set("Peter");
        String strValue = stringBox.get();
        System.out.println("strValue = "+strValue);
        
    }

}