Floating point literals in Java

Floating point literals in Java

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In Java, floating-point literals are used to represent decimal numbers. Here's a breakdown of how they work:

Basic Format

A floating-point literal in Java follows this basic format:

( digit ) ( . [digit] )?

For example, the following are valid floating-point literals:

Hexadecimal Floating-Point Literals

Java also supports hexadecimal floating-point literals using the suffix p or f. These literals are useful when you need to represent very large or very small numbers.

Here's an example of a hexadecimal floating-point literal:

123.45p+2

This represents the number 123.45 multiplied by 2^2 (or 4).

The p suffix is used for powers-of-2 representation, and the f suffix is used for fixed-point representation.

Long Floating-Point Literals

If you need to represent very large or very small numbers in your Java program, you can use a long floating-point literal using the D or d suffix. For example:

1234567890123456789.9876543210987654321D

This represents a number with a much larger scale than the standard float or double types.

Precision

When working with floating-point literals, you need to be aware of precision issues. Floating-point numbers have limited precision, which means that not all decimal values can be exactly represented as a floating-point number.

For example, the following code will print 0.1 instead of 0.10000000149011612:

float f = 0.1f;
System.out.println(f);

This is because the float type has limited precision and can only accurately represent a subset of decimal values.

In conclusion, Java floating-point literals provide a convenient way to represent decimal numbers in your code. By understanding the different formats, suffixes, and precision considerations, you'll be able to effectively use floating-point literals in your Java programming endeavors!

String literal vs String object Java

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String Literal vs String Object in Java:

In Java, a string is an object that represents a sequence of characters, such as letters or symbols. When we create a string in our code, we have two options: using a string literal or creating a string object. Understanding the difference between these two concepts is crucial for effective programming.

String Literal:

A string literal is a constant string value that is stored in the class file when it is compiled. It's an immutable sequence of characters that can be thought of as a "constant" string. When we use a string literal, Java creates a new instance of the java.lang.String class for us.

Here's an example:

String myLiteral = "Hello";

In this case, Java will create a new String object with the value "Hello" and store it in memory. This is because we are using a string literal, which is essentially a constant value that can be reused throughout our program.

String Object:

A string object is an instance of the java.lang.String class that we explicitly create using the new keyword. When we create a string object, we have more control over its behavior and lifecycle compared to a string literal.

Here's an example:

String myObject = new String("Hello");

In this case, Java creates a new instance of the String class with the value "Hello" and stores it in memory. Note that this is different from using a string literal, as we are explicitly creating a new object.

Key Differences:

Best Practices:

In summary, understanding the difference between string literals and string objects in Java is crucial for effective programming. By choosing the right approach depending on your specific requirements, you can write more efficient, readable, and maintainable code.