Explicit initializers:

Step 2 of construction takes into account any explicit initializing expressions for instance variables, examples of which are shown below:

public class Coordinate
{
// explicit initialization of instance variables
private int xPos = 100;
private int yPos = 200;
// a Coordinate constructor
public Coordinate (int xVal, int yVal)
{
xPos = xVal;

yPos = yVal;

}

// methods of the class

}

In this case, when the given Coordinate constructor is invoked, after the empty object is created, the explicit initialization is performed. In our example the variables xPos and yPos would start with the default value 0, but after explicit initialization they would have the values 100 and 200. These values would be overwritten by any initialization performed by the constructor code in step 3. Therefore, if we write: Coordinate newCoord = new Coordinate(2, 2); we still create an object described by the class Coordinate and set its two instance variables to the value 2.

In general it is best to perform initialization of instance data within a constructor, rather than using explicit initialization. This makes it easy to locate the code where initialization takes place.

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