CODEWITHSUNDEEP
javaandroid
Brandon Wilson
Brandon Wilson

Reputation: 4590

Converting double to string

I am not sure it is me or what but I am having a problem converting a double to string.

here is my code:

double total = 44;
String total2 = Double.toString(total);

Am i doing something wrong or am i missing a step here.

I get error NumberFormatException when trying to convert this.

totalCost.setOnTouchListener(new OnTouchListener() {
  public boolean onTouch(View v, MotionEvent event) {
    try {
      double priceG = Double.parseDouble(priceGal.getText().toString());
      double valG = Double.parseDouble(volGal.toString());
      double total = priceG * valG;
      String tot = new Double(total).toString();
      totalCost.setText(tot);
    } catch(Exception e) {
      Log.e("text", e.toString());
    }

    return false;
  }         
});

I am trying to do this in an onTouchListener. Ill post more code, basically when the user touches the edittext box i want the information to calculate a fill the edittext box.

Upvotes: 242

Views: 1002252

Answers (16)

EJZ
EJZ

Reputation: 1256

This is a very old post, but this may be the easiest way to convert it:

double total = 44;
String total2 = "" + total;

Upvotes: 3

REMITH
REMITH

Reputation: 1107

When you would like to format the decimal and convert it to a String DecimalFormat helps much.

Example:

DecimalFormat format = new DecimalFormat("#.####");
format.format(yourDoubleObject);

enter image description here

These are various symbols that are supported as part of pattern in DecimalFomat.

Upvotes: 0

olyanren
olyanren

Reputation: 1458

double total = 44;
String total2 = new Double(total).toString();

Upvotes: 2

Neeraj Gahlawat
Neeraj Gahlawat

Reputation: 1679

There are three ways to convert double to String.

  1. Double.toString(d)
  2. String.valueOf(d)

  3. ""+d

    public class DoubleToString {

    public static void main(String[] args) {
    double d = 122;
    System.out.println(Double.toString(d));
    System.out.println(String.valueOf(d));
    System.out.println(""+d);

}

    }

String to double

  1. Double.parseDouble(str);

Upvotes: 0

Khemraj Sharma
Khemraj Sharma

Reputation: 58934

Kotlin

You can use .toString directly on any data type in kotlin, like

val d : Double = 100.00
val string : String = d.toString()

Upvotes: 2

Khemraj Sharma
Khemraj Sharma

Reputation: 58934

Complete Info

You can use String.valueOf() for float, double, int, boolean etc.

double d = 0;
float f = 0;
int i = 0;
short i1 = 0;
char c = 0;
boolean bool = false;
char[] chars = {};
Object obj = new Object();


String.valueOf(d);
String.valueOf(i);
String.valueOf(i1);
String.valueOf(f);
String.valueOf(c);
String.valueOf(chars);
String.valueOf(bool);
String.valueOf(obj);

Upvotes: 2

Francisco Azevedo
Francisco Azevedo

Reputation: 1

How about when you do the 

totalCost.setText(tot);

You just do 

totalCost.setText( "" + total );

Where the "" + < variable > will convert it to string automaticly

Upvotes: 0

Nicholas Lu
Nicholas Lu

Reputation: 1893

Using Double.toString(), if the number is too small or too large, you will get a scientific notation like this: 3.4875546345347673E-6. There are several ways to have more control of output string format. 

double num = 0.000074635638;
// use Double.toString()
System.out.println(Double.toString(num));
// result: 7.4635638E-5

// use String.format
System.out.println(String.format ("%f", num));
// result: 0.000075
System.out.println(String.format ("%.9f", num));
// result: 0.000074636

// use DecimalFormat
DecimalFormat decimalFormat = new DecimalFormat("#,##0.000000");
String numberAsString = decimalFormat.format(num);
System.out.println(numberAsString);
// result: 0.000075

Use String.format() will be the best convenient way.

Upvotes: 39

abhishek sheregar
abhishek sheregar

Reputation: 9

Use StringBuilder class, like so:

StringBuilder meme = new StringBuilder(" ");

// Convert and append your double variable
meme.append(String.valueOf(doubleVariable));

// Convert string builder to string
jTextField9.setText(meme.toString());

You will get you desired output.

Upvotes: -1

user4945014
user4945014

Reputation:

double.toString() should work. Not the variable type Double, but the variable itself double.

Upvotes: 2

Bhavit S. Sengar
Bhavit S. Sengar

Reputation: 8924

double total = 44;
String total2 = String.valueOf(total);

This will convert double to String

Upvotes: 500

ditkin
ditkin

Reputation: 7044

This code compiles and works for me. It converts a double to a string using the calls you tried.

public class TestDouble {

    public static void main(String[] args) {
        double total = 44;
        String total2 = Double.toString(total);

        System.out.println("Double is " + total2);
    }
}

I am puzzled by your seeing the NumberFormatException. Look at the stack trace. I'm guessing you have other code that you are not showing in your example that is causing that exception to be thrown.

Upvotes: 14

agon
agon

Reputation: 51

double priceG = Double.parseDouble(priceGal.getText().toString());

double valG = Double.parseDouble(volGal.toString());

double priceG = Double.parseDouble(priceGal.getText().toString());

double valG = Double.parseDouble(volGal.toString());

double priceG = Double.parseDouble(priceGal.getText().toString());

double valG = Double.parseDouble(volGal.toString());

it works. got to be repetitive.

Upvotes: 4

Rahul Purohit
Rahul Purohit

Reputation: 41

Just use the following:

doublevalue+"";

This will work for any data type.

Example:

Double dd=10.09;
String ss=dd+"";

Upvotes: 0

Brian Roach
Brian Roach

Reputation: 76898

double priceG = Double.parseDouble(priceGal.getText().toString());
double valG = Double.parseDouble(volGal.toString());

One of those is throwing the exception. You need to add some logging/printing to see what's in volGal and priceGal - it's not what you think.

Upvotes: 1

Stephan
Stephan

Reputation: 7388

The exception probably comes from the parseDouble() calls. Check that the values given to that function really reflect a double.

Upvotes: 6

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