Essential Java Methods You Should Start Using Today
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Understanding Java's Hidden Gems
Java offers a plethora of tools for developers, enabling them to streamline their coding practices. With a wide array of built-in classes and methods, programmers can simplify complex tasks and enhance code readability. Here, we explore five Java methods that may not be widely known but can significantly elevate your coding proficiency.
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Section 1.1: decrementExact Method
The decrementExact() function, part of the Math class, serves the purpose of reducing a specified number by one and returning the result. This method operates as the inverse of incrementExact(). For instance, if you input 11, the output will be 10. It's crucial to note that this method will throw an exception if the operation leads to an overflow of the data type, so caution is advised, particularly with larger integers.
The getAsDouble() method belongs to the OptionalDouble class, which represents a value that may or may not be present. This method retrieves the double value if available; otherwise, it throws a NoSuchElementException.
The absExact() method is akin to the abs() function in the Math class, returning the absolute value of a number. However, it only yields this result if the number can be accurately represented in its original data type (int or long). An ArithmeticException will be thrown if the result causes an overflow.
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Section 1.3: endsWith Method
The endsWith() method is a fundamental string method that checks if a given string concludes with a specified suffix, returning a boolean result. It serves as the counterpart to startsWith(), which is more commonly known.
The divideUnsigned() method, found in the Integer class, enables division of two numbers while returning an unsigned quotient. Unlike signed integers, which can represent both positive and negative values, unsigned integers are limited to positive numbers only. This results in a higher maximum positive value for unsigned integers.
Syntax:
Integer.divideUnsigned(int dividend, int divisor);
Example:
int dividend = 10;
int divisor = 5;
int quotient = Integer.divideUnsigned(dividend, divisor);
System.out.println(quotient); // Output: 2
Conclusion: Summary of Key Methods
To summarize the methods discussed:
decrementExact: Decreases the specified number by one.
getAsDouble: Retrieves a double from an OptionalDouble, if present.
absExact: Returns the absolute value of a number if it can be accurately represented.
endsWith(): Checks if a string ends with a specified suffix.
divideUnsigned(): Performs division and returns an unsigned quotient.
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