Java Can we declare an object variable in the constructor?

Question

When creating an object, can we declare and initialize the object variable in constructor?

I am creating an XML based object. The XML format is derived from the previous system and is dynamic.

Therefore, an object variable is based on elements. it will be better if I declare a variable in the constructor.

In the code below, we can declare temp as an object variable.

For instance:

public class A
{
    public A()
    {
        HashMap<String, Object> temp = new HashMap<String, Object>;
    }
}

I could not find a sample code for this ideology.
Any suggestions?

Answer 1

I think you are looking for something a little different.

public class A {
   // Constructor
   private A() {
   }

   public static A createObjectA(...) {
      A result = new A();
      // In here transform the XML in a suitable format and set it into the result object.
      // Return the result
      return result;
   }
}

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, A, A :

A newObj = A.createObjectA(...);

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Answer 2

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Answer 3

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public class A
{
   HashMap<String, Object> temp;
    public A()
    {
         temp = new HashMap<String, Object>;
    }
}

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Answer 4

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temp ( { }):

public class A { 

  public A() {
      Map<String, Object> temp = new HashMap<String, Object>;        
  } // end scope of visibility for `temp`

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:

public class A {

  Map<String, Object> temp;

  public A() {
      temp = new HashMap<String, Object>;        
  }
  // you can use it here

BTW
:

Map temp = new HashMap;

:

HashMap temp = new HashMap;

: ArrayList Java

Answer 5

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