Java Program to Convert Double to String
Last Updated :
25 Dec, 2023
The primary goal of double to String conversion in Java is to store big streams of numbers that are coming where even data types fail to store the stream of numbers. It is generically carried out when we want to display the bigger values. In this article, we will learn How to Convert double to String in Java.
Program to Convert double to String in Java
Below is the implementation of double to String conversion using ‘+’ :
Java
import java.io.*;
class GFG {
public static void main(String[] args)
{
double num = 12.345 ;
String str = num + "" ;
System.out.println(str);
System.out.println(
"Type of num : "
+ ((Object)num).getClass().getSimpleName());
System.out.println(
"Type of str : "
+ ((Object)str).getClass().getSimpleName());
}
}
|
Output
12.345
Type of num : Double
Type of str : String
Explaination of the above Program:
In above program we are converting num(Double) to String using ‘+’ Operator.
Different Methods for Converting double to String in Java
There are different kinds of methods to convert double data to string data. Two standard approaches are as follows:
String
|
The valueOf() method simply typecasts below-given parameters to strings always as it is an inbuilt method of the String class in Java.
|
String valueOf(double num);
|
String
|
format() Method belongs to String and it uses precision modifier to convert double to string.
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String.format(“%f”,variable_name)
|
String
|
append() Method from StringBuilder Class is used to append the element to the end of the StringBuilder Object.
|
String str= new StringBuilder().append(variable_name).toString();
|
Decimal
|
In Java whenever a print is called, always toString() method of Object Class in Java is always called be it directly or indirectly. Even if this inbuilt function is not used and the double number is getting printed then too toString() method is called. The string is a class in Java.
|
Double.toString(var_name);
|
Decimal
|
DecimalFormat is a feature in Java in which we can format the decimal
|
DecimalFormat.getNumberInstance().format(var_name);
|
Example of Methods to Convert double to String in Java
Below is the implementation of Methods to Convert double to String:
Java
import java.io.*;
import java.text.DecimalFormat;
import java.util.*;
class GFG {
public static void main(String[] args)
{
double number = 123.456 ;
String method1 = String.valueOf(number);
System.out.println( "Using valueOf method "
+ method1);
String method2 = String.format( "%f" , number);
System.out.println( "Using format method "
+ method2);
String method3
= new StringBuilder().append(number).toString();
System.out.println( "Using append method "
+ method3);
String method4 = Double.toString(number);
System.out.println( "Using toString method "
+ method4);
String method5
= DecimalFormat.getNumberInstance().format(
number);
System.out.println( "Using Decimalformat method "
+ method5);
}
}
|
Output
Using valueOf method 123.456
Using format method 123.456000
Using append method 123.456
Using toString method 123.456
Using Decimalformat method 123.456
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