Question

Explain wrappers classes in java with suitable example

Answer 1

A Wrapper class is a class whose object wraps or contains a primitive data types. When we create an object to a wrapper class, it contains a field and in this field, we can store a primitive data types. In other words, we can wrap a primitive value into a wrapper class object.
public class WrapperExample1{
public static void main(String args[]){
//Converting int into Integer
int a=20;
Integer i=Integer.valueOf(a);//converting int into Integer
Integer j=a;//autoboxing, now compiler will write Integer.valueOf(a) internally

System.out.println(a+" "+i+" "+j);
}}

Answer 2

Answer:

wrapper classes convert primitive data types in two objects objects are needed if we wish to modify the arguments passed into a method because it might have data types are passed by value.

the classes in Java. util package handles only objects and hence wrapper classes helps in this case also.