Any string to long java

Convert String to long in Java

Learn to convert a String to Long type in Java using Long.parseLong(String) , Long.valueOf(String) methods and new Long(String) constructor.

String number = "2018"; //String long value1 = Long.parseLong( number, 10 ); long value2 = Long.valueOf( number ); long value3 = new Long( number ); 

1. Using Long.valueOf(String)

The Long.valueOf() method parses the input string to a signed decimal long type. The characters in the string must all be decimal digits, except that the first character may be a minus (-) sign for negative numbers and a plus(+) sign for positive numbers.

The result long value is exactly the same as the string argument in base 10. In the following example, we convert one positive and one negative number to a long value.

String positiveNumber = "+12001"; long value1 = Long.valueOf(positiveNumber); //12001L String negativeNumber = "-22002"; long value2 = Long.valueOf(negativeNumber); //-22002L

If the string cannot be parsed as a long, it throws NumberFormatException.

Assertions.assertThrows(NumberFormatException.class, () -> < Long.valueOf("alexa"); >);

2. Using Long.parseLong(String)

The rules for Long.parseLong(String) method are similar to Long.valueOf(String) method as well.

• It parses the String argument as a signed decimal long type value.
• The characters in the string must all be decimal digits, except that the first character may be a minus (-) sign for negative numbers and a plus(+) sign for positive numbers.
• The result long value is exactly the same as the string argument in base 10.

Again, we will convert one positive number and one negative number to long value using parseLong() API.

String positiveNumber = "+12001"; long value1 = Long.parseLong(positiveNumber); //12001L String negativeNumber = "-22002"; long value2 = Long.parseLong(negativeNumber); //-22002L

If the input String is in another base then we can pass the base as second input to the method.

String numberInHex = "-FF"; long value = Long.parseLong(numberInHex); //-255L

3. Using new Long(String) Constructor

Another useful way is to utilize Long class constructor to create new long object. This method has been deprecated since Java 9, and recommended to use parseLong() API as discussed above.

long value = new Long("100"); //100L

Using any of the given approaches, if the input String does not have only the decimal characters (except the first character, which can be plus or minus sign), we will get NumberFormatException error in runtime.

String number = "12001xyz"; long value = Long.parseLong(number); //Error Exception in thread "main" java.lang.NumberFormatException: For input string: "12001xyz" at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65) at java.lang.Long.parseLong(Long.java:589) at java.lang.Long.<init>(Long.java:965) at com.howtodoinjava.StringExample.main(StringExample.java:9)

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Java String to Long — How to Parse String Into Long?

A quick guide on how to convert and parse String to Long in java with examples.

1. Overview

This problem can be solved in many ways but we will look at the most commonly used in real-time applications.

Sometimes you get the number in string format. So, you need to parse the string to long value to perform the operations on the long number.

2. Java Parse String to Long using Long.parseLong()

The first character of the string is used for the sign of the number either plus(+) or minus(-) but this is optional.

package com.javaprogramto.programs.strings.tolong; public class StringToLongExample < public static void main(String[] args) < String positiveString = "12345"; long longvalue1 = Long.parseLong(positiveString); System.out.println("Positive Long value 1 : " + longvalue1); String positiveString2 = "+12345"; long longvalue2 = Long.parseLong(positiveString2); System.out.println("Positive Long value 2 : " + longvalue2); String negativeValue1 = "-12345"; long longvalue3 = Long.parseLong(negativeValue1); System.out.println("Negative Long value 3 : " + longvalue3); >>

Positive Long value 1 : 12345 Positive Long value 2 : 12345 Negative Long value 3 : -12345

3. Java Convert String to Long using Long.valueOf()

Long.valueOf() method takes the string value and converts it into the Long wrapper object. But whereas parseLong() method converts into primitive long value.

package com.javaprogramto.programs.strings.tolong; public class StringToLongExample < public static void main(String[] args) < String positiveString = "12345"; long longvalue1 = Long.parseLong(positiveString); System.out.println("Positive Long value 1 : " + longvalue1); String positiveString2 = "+12345"; long longvalue2 = Long.parseLong(positiveString2); System.out.println("Positive Long value 2 : " + longvalue2); String negativeValue1 = "-12345"; long longvalue3 = Long.parseLong(negativeValue1); System.out.println("Negative Long value 3 : " + longvalue3); >>

4. Java Convert String to Long using Long Constructor

package com.javaprogramto.programs.strings.tolong; public class StringToLongExample3 < public static void main(String[] args) < String positiveString = "12345"; Long longvalue1 = new Long(positiveString); System.out.println("Positive Long value 1 : " + longvalue1); String positiveString2 = "+12345"; Long longvalue2 = new Long(positiveString2); System.out.println("Positive Long value 2 : " + longvalue2); String negativeValue1 = "-12345"; Long longvalue3 = new Long(negativeValue1); System.out.println("Negative Long value 3 : " + longvalue3); >>

5. Java String to Long — String is with non-digits

package com.javaprogramto.programs.strings.tolong; public class StringToLongExample4 < public static void main(String[] args) < long one = Long.parseLong("abc133"); Long two = Long.valueOf("abc133"); Long three = new Long("abc133"); >>

The program fails at the runtime because string is having alphabets that are other than numbers.

Exception in thread "main" java.lang.NumberFormatException: For input string: "abc133" at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:68) at java.base/java.lang.Long.parseLong(Long.java:707) at java.base/java.lang.Long.parseLong(Long.java:832) at com.javaprogramto.programs.strings.tolong.StringToLongExample4.main(StringToLongExample4.java:7)

6. Conclusion

In this article, we have seen how to parse String to Long in java and what are the possible error if the string is with non digits values.

But among all of these 3 ways, Long,parseLong() method is suggested to use because valueOf() and Long constructor uses internally parseLong() method.

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