Convert String to Long in Java

In Java programming, there’s often a need to change one type of information into another. Imagine you have a number written as a word (like “five”), but you need to use it in a math problem. That’s similar to what we’re doing when we convert  String to Long in Java. It might sound a bit fancy, but don’t worry – we’re here to break it down for you in simple terms. In this blog, you’ll learn how to convert string to long in Java in the following ways:

  • Using Long.parselLong() method
  • Using Long.valueOf() method

Convert String to Long in Java using Long.parseLong() Method

// Convert String to Long in Java
public class StringLongEx {
  public static void main(String[] args)
    String str = "2512";
    String str2 = "-145";

    //Conversion using parseLong(String) method
    long num = Long.parseLong(str);
    long num2 = Long.parseLong(str2);

Explanation of Java
This Java code demonstrates how to convert Strings to Long and perform arithmetic operations. 

  • The `StringLongEx` class initializes two String variables, `str` and `str2`, representing numeric values. 
  • The `Long.parseLong()` method is then utilized to convert these Strings into long integers (`num` and `num2`). 
  • Finally, the code calculates the sum of these long values and prints the result. In this example, the Strings “2512” and “-145” are successfully converted to long integers, demonstrating the ability to handle positive and negative numeric representations. 
  • The final sum, obtained through the `println` statement, showcases the successful conversion and arithmetic operation.



Convert String to Long in Java using Long.valueOf() Method

// Convert String to Long in Java
public class StringLongEx {
  public static void main(String[] args)
    String string1 = "154";
    String string2 = "4532";
    //Conversion using valueOf(String) method
    long num1 = Long.valueOf(string1);
    long num2 = Long.valueOf(string2);

Explanation of Java:

In this Java program, we aim to convert two Strings, “154” and “4532,” into long integers using the `Long.valueOf()` method. 

  • The `valueOf()` method transforms a String representation of a number into its corresponding long integer. 
  • We declare two String variables, `string1` and `string2`, each containing a numeric value. Through the `Long.valueOf()` method, we convert these Strings into long integers, stored in the variables `num1` and `num2`. 
  • Finally, we print the results using `System.out.println()`. 
  • The output of this program will display the converted long integers, 154 and 4532, demonstrating the successful conversion from Strings to long values.



What’s Long.parseLong()?

Think of the Long.parseLong() method as a magic tool that helps Java understand numbers written as words (Strings). It’s like a translator that turns “five” into 5, making it easier for Java to work with.

What is Long.valueOf()?
The `Long.valueOf()` method in Java is a static method that parses the given String as a signed decimal long, returning a `Long` object.

Performance Comparison

When it comes to converting Strings to long integers in Java, the performance of methods like `Long.parseLong()` and `Long.valueOf()` plays a crucial role. Let’s delve into a performance comparison, exploring benchmarking, factors influencing performance, and recommendations for optimizing conversion speed.

A. The Race of Methods: Which One’s Faster?

Picture this: Benchmarking is like timing two cars in a race to see which reaches the finish line first. Similarly, when we compare `Long.parseLong()` and `Long.valueOf()`, it’s like finding out which method is speedier in turning words into numbers.

B. The Road to Quick Conversions

Think of converting Strings to numbers as a journey. The longer and more complicated the road (input String), the more time it takes. Handling errors is like putting up detour signs – it slows things down. Just like a well-maintained car runs smoothly, how each method manages memory affects how fast it works.

C. Tips to Turbocharge Your Code

To speed things up, think of your data like a well-known route. If you’re sure it’s a straightforward journey (valid input), skip some error-checking steps. Choosing the right method is like picking the right tool – `Long.parseLong()` is like a quick fix, while `Long.valueOf()` is your safety net. Keep your code organized, and avoid unnecessary detours (conversions) for a faster trip!

In conclusion, mastering the conversion of Strings to Long in Java is a valuable skill for developers. The interplay between `Long.parseLong()` and `Long.valueOf()` provides flexibility based on specific requirements. By understanding their nuances, developers can navigate this process efficiently, ensuring robust and error-free code.
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