Create new object using reflection?

Question

Given class Value : ``` public class Value { private int xVal1; private int xVal2; private double pVal; // constructor of the Value class public Value(int _xVal1 ,int _xVal2 , double _pVal) { this.xVal1 = _xVal1; this.xVal2 = _xVal2; this.pVal = _pVal; } public int getX1val() { return this.xVal1; } ... } ``` I'm trying to create a new instance of that class using `reflection` : from Main : ``` .... // some code .... .... int _xval1 = Integer.parseInt(getCharacterDataFromElement(line)); int _xval2 = Integer.parseInt(getCharacterDataFromElement(line2)); double _pval = Double.parseDouble(getCharacterDataFromElement(line3)); Class c = null; c = Class.forName("Value"); Object o = c.newInstance(_xval1,_xval2,_pval); ... ``` This doesn't work , Eclipse's output : `The method newInstance() in the type Class is not applicable for the arguments (int, int, double)` If so , how can I create a new Value object using `reflection` , where I invoke the `Constructor` of `Value` ? Thanks

Accepted Answer

You need to locate the exact constructor for this. `Class.newInstance()` can only be used to call the nullary constructor. So write

```
final Value v = Value.class.getConstructor(
   int.class, int.class, double.class).newInstance(_xval1,_xval2,_pval);
```

Create new object using reflection?

Solution

Problem