String to double method

Question

This might be a very simple questions but i cant find a hint anywhere.

I have check the below links but still cannot find what is wrong with my code.
Returning a double from a method
Easiest way to return double from another class

What i want is to return a method that return a 2 decimal double.

Call the below method but it is not running.

toDouble(double1);//the result are not 2 decimals
edittext.setText(String.valueOf(double1));

public double toDouble(double d){
  String str = String.format("%1.2f", d);
  d = Double.valueOf(str);
  return d;
}

It work well when i code like this

  String str = String.format("%1.2f", double1);
  double1 = Double.valueOf(str);

Anyone can guide me in this?

Edit 1
If anyone reading this. It is a silly mistake.
**Forgot to define the double

double1 = toDouble(double1);//the result are not 2 decimals
edittext.setText(String.valueOf(double1));

If this is for some monetary value it is better to use BigDecimal instead. This class allows fine control over rounding. — Henry, Nov 13 '18 at 08:25
You're not assigning the return value of `toDouble(double1)` to anything or printing it. Did you just miss it? — pri, Nov 13 '18 at 08:26
@Tim Not running means the double i set to textview are still with lots of decimals instead of 2. — Tony Ming, Nov 13 '18 at 08:29
double parsedDouble = toDouble(double1); edittext.setText(String.valueOf(parsedDouble)); Use this line — Al-Amin, Nov 13 '18 at 08:35
looks like you are missing Java basics. Pleas epass through some Java basic tutorial about how to use methods — Vladyslav Matviienko, Nov 13 '18 at 08:47

score 1 · Accepted Answer · answered Nov 13 '18 at 08:45

1

you should pass the value to your method, you by mistake set value directly inside settext

the below code is wrong

edittext.setText(String.valueOf(double1));

instead you should write

edittext.setText(String.valueOf(toDouble(double1)));

answered Nov 13 '18 at 08:45

Amir

179
2
14

yep, solved it. just done it by edittext.setText(String.valueOf(toDouble(double1))); – Tony Ming Jan 16 '19 at 03:48

score 1 · Answer 2 · answered Nov 13 '18 at 09:00

1

Simply do it in a single line:

edittext.setText(String.valueOf(toDouble(double1)))

answered Nov 13 '18 at 09:00

Sultan Mahmud

1,245
8
18

String to double method

2 Answers2