JAVA - Converstion String (With dot) to Long

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I have problem about convertion from string to long value. Example :

String a = "4.0";
Long l= Long.parseLong(a);

When I execute, get exception:

Exception in thread "main" java.lang.NumberFormatException: For input string: "4.0"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Long.parseLong(Long.java:589)
at java.lang.Long.parseLong(Long.java:631)
at com.tests.Test2.main(Test2.java:69)

Any idea? Thanks!

4.0 isn't a long value It's a double, Try Double.parseDouble(a)

Converting Between Numbers and Strings (The Java™ Tutorials , Frequently, a program ends up with numeric data in a string object—a value entered by Long , and Short ) each provide a class method named valueOf that converts a string to an System.out.println(dot + " digits " + "before decimal point. 1. Java – Convert String to long using Long.parseLong (String) Long.parseLong (String): All the characters in the String must be digits except the first character, which can be a digit or a minus ‘-‘. For example – long var = Long.parseInt ("-123"); is allowed and the value of var after conversion would be -123.

You are attempting to covert a string with an unsupported character, ., into a Long. This is not supported by https://docs.oracle.com/javase/7/docs/api/java/lang/Long.html#parseLong(java.lang.String). Try Long l = Double.valueOf(a).longValue();: https://docs.oracle.com/javase/7/docs/api/java/lang/Double.html#valueOf(java.lang.String).

Java Convert Double To Long - Examples, Java convert double to Long – We have different ways to convert a double value to only digits we should truncate the available string up to dot (decimal point). 3 Java examples to convert String to long value using Long.parseLong(String), Long.valueOf(String) and new Long(String) constructor.

You can also use Double.valueOf(a)

Double.parseDouble(String) will return a primitive double type. Double.valueOf(String) will return a wrapper object of type Double.

Depending on your need you can use one of teh above

Java String To Long Examples, Java convert String to long: There are three ways to convert a String to long value​. Long.parseLong(String), Long.valueOf() and Long(String s) constructor. In java, int and long do not have fractional parts, so a string like 3000.1 cannot be covnerted to one of these. It can be converted to float or double but if you read the above article you will realize that the coversion can be lossy, i.e. if you canvert that double back to a String you may not get the original 3000.1 back.

Ur code String a = "4.0"; Str a isnt Long,It's Double, if U want to converstion to Long, U need to converstion Double.type first. U should : Double d = Double.valueOf(a); then Long re = d.longValue() or use Ur method Long re = d.toLong re is final result.

Java String to long Conversion with examples, For a normal String, you can use Long.valueOf to convert it directly. String bigNumber = "1234567899"; long result  There are three main ways to convert a long value to String in Java e.g. by using Long.toString(long value) method, by using String.valueOf(long) and by concatenating with an empty String. You can use any of these method to convert a long data type into String object.

Convert String with commas to Long - Java, How do I convert a string number value with a dollar sign to BigDecimal in java? public static Long formatLong(String value, Locale locale) { Long result = null; if (value != null) { NumberFormat formatter Java dots and commas at decimals. We can convert long to String in java using String.valueOf() and Long.toString() methods. Scenario. It is generally used if we have to display long number in textfield in GUI application because everything is displayed as a string in form. 1) String.valueOf() The String.valueOf() is an overloaded method. It can be used to convert long to String.

java.text.NumberFormat.parse java code examples, This post will show examples on how to convert Java Float to String. Dec 27, 2013 · I have long string with (delimiter) comma separated and want to covert it Edit: If you really want Get the radix character (decimal dot, decimal comma, etc. 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.

Convert float to string with commas python, Converts the specified string representation of a number to an equivalent public long ToInt64( IFormatProvider provider ) { // The Double conversion rounds​  Other Java “String to long” conversion notes. Note that I call trim() on the string I’m converting. If you don’t call trim and you get a string with blank spaces in it, you’ll get a NumberFormatException. Long.toString(long l) is used to convert in the other direction, from long to String.

Comments
  • Mostly sounds correct, except "use Ur method Long re = d.toLong". What is d.toLong? I can't find Double#toLong in the Double JDK Javadocs.