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javainstances

Can an instance complete its arguments later?

I wonder if there is any way that I can declare a new instance with parameters, do not fill them, and just set them later.

Here is an example:

private Example example = new Example() // Need 1 parameter.

public void foo(Object arg1)
{
   example = new Example(arg1);
}

It is clear that this is not possible, but is there a way to do something similar to that?

Solution

  • You can always use a parameter-less constructor, and then set the properties of the created instance later.

    ....
public Example ()
{
    this.s = null;
}

public Example (String s)
{
    this.s = s;
}
....
public void setS (String s)
{
    this.s = s;
}
....
Example ex = new Example ("something");
Example ex2 = new Example ();
ex2.setS("Something Else");