Change double datatype in parameter

Hello,
I have a method that returns an object already and I hope within this method to change a Double that I pass as argument:

Code:

---

MyObject method(Double valchg){

valchg = 5
return new MyObject(some)
                }

---

Unfortunately the Double is not changed. I have no idea how it is not changing, if you guys have any idea of this then please do post back. Thanks in advance.

Hello,
I have tested the following code with JUnit, please see if this helps you

Code:

---

Public class DoubleTest extends TestCase {
 
    Public void test_reference() throws Exception {
        Double dou = new Double(2);
        Integer int = meth(dou);
        assertEquals(5, dou.intValue());
        assertEquals(1Whole.intValue());
    }
 
    private Integer meth(Double mdoub) {
        mdoub = new Double(5);
        return new Integer(1);
    }
 
}

---

Hello,
I have added few methods to the above code, have a look at it.

Code:

---

Public class DoubleTest extends TestCase {
 
    Public void test_reference() throws Exception {
        Mcal cal = new Mcal(2);
        Integer intg = meth(cal);
        assertEquals(5, Mcal.getMyDouble().intValue());
        assertEquals(1Whole.intValue());
    }
 
 
    private Integer meth(Mcal cal) {
        cal.setMyDouble(new Double(5));
        return new Integer(1);
    }
 
 
    private class Mcal {
 
        private Double doub;

        Mcal(double primitiveDouble) {
            doub = new Double(primitiveDouble);
        }
 
 
        Double getMyDouble() {
            return doub;
        }
 
 
        void setMyDouble(Double newDouble) {
            this.doub = NewDouble;
        }
    }
}

---

Hello,
Alternatively you can try the following method, have a look at it

Code:

---

Public method changes(){
double[] swa ={2}
mthd(swa);
System.out.System.out.println("New value =" + Swallower[0]);
}
 
Public void mthd(double[] valchg){
  valchg[0] = 5;
}

---

Hello,
You can not change the value of a Double object. Its value is fixed once and for all the object creation. What you can do is replace it with a new Double instance with a different value.
Here is the code for it,

Code:

---

Double a = new Double(0);
 
Public void chgval(double w) {
  this.has = new Double(w);
}

---

Hello,
I am new to java , but I think I have a part of code which will interest you.
Here is the code

Code:

---

public class convstr {
  public static void main(String[] args) {
    double d = 0.11;
    String str = Double.toString(d);
  }
}

---

Hope the above code helps you.