Computer Applications

What are wrapper classes?

Java Library Classes

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Answer

Wrapper classes are specially designed classes that act as wrappers to primitive data types so that primitive values can be accessed as objects.

For example, Integer is a wrapper class for int data type and Float is a wrapper class for float data type.

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What is the output of this program?

class Output {
    public static void main(String args[])
    {
        Integer i = new Integer(257); 
        byte x = i.byteValue(); 
        System.out.print(x);
    }
}

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What is the output of this program ?

class Output
{
    public static void main(String args[]) 
    { 
        Integer i = new Integer(514);
        float x = i.floatValue(); 
        System.out.print(x);
    }
}

0
1
257
514.0