Convert String to Float in Java

Convert String to Float in Java

There are many ways to Convert String to Float and vice-versa like

String concatenation
Float.toString() method
Float.parseFloat(string)
String.valueOf() method 

 
We see them one by one

Convert String to Float

 package com.javacodestuffs.core.converters;

public class StringToFloat {

	public static void main(String[] args) {
		String floatString = "151.00";
		try {
			float ft = Float.valueOf(floatString.trim()).floatValue();

			System.out.println("float string is : " + floatString);
			System.out.println("float is : " + ft);
		}
		catch(NumberFormatException nfe) {
			System.err.println("NumberFormatException: " + nfe.getMessage());
		}
	}
}
output:
$javac com/javacodestuffs/core/converters/StringToFloat.java
$java -Xmx128M -Xms16M com/javacodestuffs/core/converters/StringToFloat

float string is : 151.00
float is : 151.0

Using Float.parseFloat(string)

you can also convert a Java String to a Java float field as shown below example.

package com.javacodestuffs.core.converters;

public class ConvertStringToFloat {
	public static void main(String[] args) {
		try {
			String floatString1 = "hello";
			String floatString2 = "121.00";

			//float fl1 = Float.parseFloat(string); you can't do it ,exception will thrown as java.lang.NumberFormatException: For input string: "foo"
			float fl2 = Float.parseFloat(floatString2);

			System.out.println("float string is : " + fl2);

		}
		catch(NumberFormatException ex) {
			ex.printStackTrace();
		}
	}
}
output:
float string is : 121.0

Convert float to String

For converting float to string we can use String.valueOf(fl2) or toString() method.

Example1

package com.javacodestuffs.core.converters;

public class ConvertFloatToString1 {
	public static void main(String[] args) {

		float fl2 = 0.1235f;
		String floatString = String.valueOf(fl2);

		System.out.println("float is : " + fl2);
		System.out.println("float equivalent to String : " + floatString);

	}
}
output:
float is : 0.1235
float equivalent to String : 0.1235

Example2

package com.javacodestuffs.core.converters;

public class ConvertFloatToString2 {
	public static void main(String[] args) {

		Float fl = Float.valueOf(12.045f);
		String floatString = fl.toString();

		System.out.println("float is : " + fl);
		System.out.println("float equivalent to String : " + floatString);

	}
}
output:
float is : 12.045
float equivalent to String : 12.045

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In this article, we have seen how to Convert String to Float in Java with examples. All source code in the article can be found in the GitHub repository.