Generic in Java 1.5 tutorial

 

Generic in java 1.5 tutorial

                      To create collection with type safe object generic is used, it can reduce unnecessary cast in our application , Avoid type cast may be caused by operational errors, this tutorial compares the difference between 1.4 and 1.5 version of jdk

Old Syntax:

ArrayList o=new arrayList();
o.add(new Integer(3));
o.add(new Integer(4));
int i=((Integer)(list.get(0))).parseInt();


New Syntax:

ArrayList<Integer> o=new ArrayList<Integer>();
o.add(new Integer(3));
o.add(new Integer(4));
int i=(list.get(0).parseInt();

To learn more on Generic you can choose Java Training  or Java Tutorial

Example:

public class JdkGeneric<T> {

    private T t;

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

    public T get() {
        return t;
    }

    public static void main(String[] args) {
        JdkGeneric<Integer> integerBox = new JdkGeneric<Integer>();
        JdkGeneric<String> stringBox = new JdkGeneric<String>();

        integerBox.add(new Integer(10));
        stringBox.add(new String("Hello World"));

        System.out.printf("Integer Value :%d\n\n", integerBox.get());
        System.out.printf("String Value :%s\n", stringBox.get());
    }
}




Output

Integer Value :10
String Value :Hello World