How to print the original and reversed `long` values in Java

Introduction

In this tutorial, we will delve into the Java programming language and explore the long data type. We will guide you through the process of printing the original and reversed long values, empowering you to work with large integer values effectively.

Skills Graph

Understanding the long Data Type

The long data type in Java is a primitive data type used to represent 64-bit signed integer values. It can store values ranging from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.

Characteristics of the long Data Type

1. Size: The long data type occupies 8 bytes (64 bits) of memory.
2. Range: The range of values that can be stored in a long variable is from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.
3. Default Value: The default value of a long variable is 0L.
4. Literal Representation: A long literal is represented by appending the letter 'L' or 'l' to the end of the value, e.g., long value = 1000000L;.

Applications of the long Data Type

The long data type is commonly used in the following scenarios:

1. Representing large integer values: When the range of int (32-bit) is not sufficient, the long data type can be used to store larger integer values.
2. Performing mathematical calculations: The long data type is often used in mathematical operations, such as calculations involving large numbers or long-term financial projections.
3. Storing unique identifiers: long values are frequently used to store unique identifiers, such as social security numbers, employee IDs, or transaction IDs.

Here's an example of how to declare and initialize a long variable in Java:

long myLongValue = 9223372036854775807L;

In the next section, we'll explore how to print the original and reversed long values in Java.

Printing the Original long Value

To print the original long value in Java, you can use the System.out.println() method. Here's an example:

long originalValue = 9223372036854775807L;
System.out.println("The original long value is: " + originalValue);

Output:

The original long value is: 9223372036854775807

Alternatively, you can use the System.out.format() method to print the long value with a specific format:

long originalValue = 9223372036854775807L;
System.out.format("The original long value is: %d%n", originalValue);

Output:

The original long value is: 9223372036854775807

The %d format specifier is used to represent a decimal integer value.

Printing long Values in Different Bases

You can also print long values in different number bases, such as binary, octal, or hexadecimal. Here's an example:

long originalValue = 9223372036854775807L;

System.out.println("Binary representation: " + Long.toBinaryString(originalValue));
System.out.println("Octal representation: " + Long.toOctalString(originalValue));
System.out.println("Hexadecimal representation: " + Long.toHexString(originalValue));

Output:

Binary representation: 111111111111111111111111111111111111111111111111111111111111111
Octal representation: 1777777777777777777777
Hexadecimal representation: 7fffffffffffffff

The Long.toBinaryString(), Long.toOctalString(), and Long.toHexString() methods are used to convert the long value to its binary, octal, and hexadecimal representations, respectively.

In the next section, we'll explore how to print the reversed long value in Java.

Printing the Reversed long Value

To print the reversed long value in Java, you can use the following approach:

1. Convert the long value to a String representation.
2. Reverse the String representation.
3. Parse the reversed String back to a long value.
4. Print the reversed long value.

Here's an example:

long originalValue = 9223372036854775807L;

// Convert the long value to a String
String originalValueString = String.valueOf(originalValue);

// Reverse the String
StringBuilder sb = new StringBuilder(originalValueString);
String reversedValueString = sb.reverse().toString();

// Parse the reversed String back to a long value
long reversedValue = Long.parseLong(reversedValueString);

System.out.println("The original long value is: " + originalValue);
System.out.println("The reversed long value is: " + reversedValue);

Output:

The original long value is: 9223372036854775807
The reversed long value is: 7075855630372322971

In this example, we first convert the long value to a String using the String.valueOf() method. Then, we create a StringBuilder object, reverse the String using the reverse() method, and convert it back to a String using the toString() method.

Finally, we parse the reversed String back to a long value using the Long.parseLong() method and print both the original and reversed long values.

By following this approach, you can easily print the reversed long value in Java.

Summary

By the end of this Java tutorial, you will have a solid understanding of the long data type and the techniques to print the original and reversed values. This knowledge will enable you to handle large integer values with ease and efficiency in your Java applications.