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Converting Between Numbers and Strings (The Java™ Tutorials > Learning the Java Language > Numbers and Strings)
Trail: Learning the Java Language
Lesson: Numbers and Strings
Section: Strings
Home Page > Learning the Java Language > Numbers and Strings
Converting Between Numbers and Strings

Converting Strings to Numbers

Frequently, a program ends up with numeric data in a string object—a value entered by the user, for example.

The Number subclasses that wrap primitive numeric types ( Byte, Integer, Double, Float, Long, and Short) each provide a class method named valueOf that converts a string to an object of that type. Here is an example, ValueOfDemo , that gets two strings from the command line, converts them to numbers, and performs arithmetic operations on the values:

public class ValueOfDemo {
    public static void main(String[] args) {

	    //this program requires two arguments on the command line  
        if (args.length == 2) {
			//convert strings to numbers
            float a = (Float.valueOf(args[0]) ).floatValue();  
            float b = (Float.valueOf(args[1]) ).floatValue();

            //do some arithmetic
            System.out.println("a + b = " + (a + b) );
            System.out.println("a - b = " + (a - b) );
            System.out.println("a * b = " + (a * b) );
            System.out.println("a / b = " + (a / b) );
            System.out.println("a % b = " + (a % b) );
        } else {
           System.out.println("This program requires two command-line arguments.");
        }
    }
}
The following is the output from the program when you use 4.5 and 87.2 for the command-line arguments:
a + b = 91.7
a - b = -82.7
a * b = 392.4
a / b = 0.0516055
a % b = 4.5

Note: Each of the Number subclasses that wrap primitive numeric types also provides a parseXXXX() method (for example, parseFloat()) that can be used to convert strings to primitive numbers. Since a primitive type is returned instead of an object, the parseFloat() method is more direct than the valueOf() method. For example, in the ValueOfDemo program, we could use:
float a = Float.parseFloat(args[0]);
float b = Float.parseFloat(args[1]);

Converting Numbers to Strings

Sometimes you need to convert a number to a string because you need to operate on the value in its string form. There are several easy ways to convert a number to a string:
int i;
String s1 = "" + i; //Concatenate "i" with an empty string;
                    //conversion is handled for you.
or
String s2 = String.valueOf(i);  //The valueOf class method.
Each of the Number subclasses includes a class method, toString(), that will convert its primitive type to a string. For example:
int i;
double d;
String s3 = Integer.toString(i); 
String s4 = Double.toString(d); 
The ToStringDemo example uses the toString method to convert a number to a string. The program then uses some string methods to compute the number of digits before and after the decimal point:
public class ToStringDemo {
    
    public static void main(String[] args) {
        double d = 858.48;
        String s = Double.toString(d);
        
        int dot = s.indexOf('.');
        
        System.out.println(dot + " digits before decimal point.");
        System.out.println( (s.length() - dot - 1) + 
		" digits after decimal point.");
    }
}
The output of this program is:
3 digits before decimal point.
2 digits after decimal point.
Previous page: Strings
Next page: Manipulating Characters in a String

JAVA, JSP, SERVLETS, TOMCAT, SERVLETS MANAGER,
Private JVM (Java Virtual Machine),
Private Tomcat Server

Alden Hosting offers private JVM (Java Virtual Machine), Java Server Pages (JSP), Servlets, and Servlets Manager with our Web Hosting Plans WEB 4 PLAN and WEB 5 PLAN , WEB 6 PLAN .

At Alden Hosting we eat and breathe Java! We are the industry leader in providing affordable, quality and efficient Java web hosting in the shared hosting marketplace. All our sites run on our Java hosing platform configured for optimum performance using Java, Tomcat, MySQL, Apache and web application frameworks such as Struts, Hibernate, Cocoon, Ant, etc.

We offer only one type of Java hosting - Private Tomcat. Hosting accounts on the Private Tomcat environment get their very own Tomcat server. You can start and re-start your entire Tomcat server yourself.


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