Autobox unbox takes place with method parameters and return values.

 
 
public class AutoBox2 { 
  // Take an Integer parameter and return an int value; 
  static int m(Integer v) { 
    return v ; // auto-unbox to int 
  }  
 
  public static void main(String args[]) {     
    // Pass an int to m() and assign the return value 
    // to an Integer.  Here, the argument 100 is autoboxed 
    // into an Integer.  The return value is also autoboxed into an Integer. 
    Integer iOb = m(100);  
 
    System.out.println(iOb); 
  } 
}

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Autobox unbox takes place with method parameters and return values. : Autobox Unbox « Data Type « Java

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