Wrapper Class in Java

In Java, there is a wrapper class that wraps or, we can call, encapsulates primitive datatype into an object.
They are converted in such a way that when there arises a situation for a need of objects such as collections and generic types or other object-oriented constructs.

Eight wrapper classes in Java correspond to the eight primitive data types:

Why wrapper class?

• The wrapper class is worthy because of its ability to convert primitive data types into objects.
• Objects are useful when it is needed for the arguments to be modified.
• Java.util classes only handle objects, so the wrapper class here is helpful.
• The object is crucial for multithreading.

    public static void main(String[] args) {
        int a = 100;

        Integer intWr = new Integer(a);

        System.out.println(intWr);

        long b = 84848484;

        Long strWr = new Long(b);

        System.out.println(b);
    }

• Here we used the wrapper class to convert primitive value int and long to objects Long and Int.
• Although this method approach is deprecated instead, we can use this.

    public static void main(String[] args) {
        int a = 100;
        Integer intWr = Integer.valueOf(a);
        System.out.println(intWr);
        long b = 84848484;
        Long strWr = Long.valueOf(b);
        System.out.println(b);
    }