Answers for "what is wrapper class"

7

wrapper classes in java

Wrapper classes: classes that are dedicated to primitives        
Byte, Short, Integer, Long, Float, Double, Character, Boolean
presented in "java.lang" package
AutoBoxing: converting primitive values to wrapper class
		int a = 100;
		Integer b = a  // auto boxing
Unboxing: converting wrapper class value to primitives
		Integer a = 100;
		int b = a;  // unboxing
	int a = 100;
	double b = a;    // none
Posted by: Guest on May-28-2021
0

Wrapper classes in java

public class WrapperClassExample
{
   public static void main(String[] args)
   {
      // before java 5 version
      int num = 70;
      // we were converting explicitly like this
      Integer i = Integer.valueOf(num);
      // printing Integer object value explicitly
      System.out.println(i);

      // in java 5 version
      // Autoboxing and unboxing feature was introduced
      // now there is no need of explicit conversion
      Integer i1 = num;
      System.out.println(i1);
   }
}
Posted by: Guest on November-04-2021
0

Java wrapper classes

ArrayList<Integer> myNumbers = new ArrayList<Integer>(); // Valid
Posted by: Guest on August-01-2021
0

Java wrapper classes

ArrayList<int> myNumbers = new ArrayList<int>(); // Invalid
Posted by: Guest on August-01-2021

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