Section 1.1: incrementExact()

The incrementExact() method is part of the Math class and simply returns the input number incremented by one. For instance, if you provide 5 as an argument, it will return 6. However, be cautious of potential overflow if the input number is at its maximum limit.

Syntax:

Math.incrementExact(number);

Example:

System.out.println(Math.incrementExact(10)); // Output: 11

Section 1.2: IEEEremainder()

The IEEEremainder() method, also part of the Math class, calculates the remainder of two numbers based on the IEEE 754 standard. This method takes two arguments: a dividend and a divisor, and it returns the remainder following the standard's specific guidelines.

Syntax:

Math.IEEEremainder(dividend, divisor);

Example:

System.out.println(Math.IEEEremainder(13, 7)); // Output: -1.0

The first video titled "Java Beginner Course #8: Methods" provides a great overview of methods and their usage in Java programming.

Section 1.3: expm1()

The expm1() method calculates the result of (e^x) - 1 and returns it as a double. Here, e represents the base of natural logarithms.

Syntax:

Math.expm1(x);

Example:

double result = Math.expm1(3);

System.out.println(result); // Output: 19.085536923187668

Section 1.4: getCurrencyCode()

The getCurrencyCode() method belongs to the Currency class and returns the currency code for a specified currency object. This is particularly useful in financial applications.

Syntax:

currency.getCurrencyCode();

Example:

Currency japan = Currency.getInstance("JPY");

System.out.println(japan.getCurrencyCode()); // Output: JPY

The second video titled "Method Reference In Java 8 - How it really works?" dives deeper into method references and their practical applications.

Section 1.5: equalsIgnoreCase()

The equalsIgnoreCase() method compares two strings in a case-insensitive manner, returning true if they are equal, regardless of their case.

Syntax:

String.equalsIgnoreCase(anotherString);

Example:

String str1 = "tandrew";

String str2 = "tanDReW";

System.out.print("equalsIgnoreCase: " + str1.equalsIgnoreCase(str2)); // Output: true

Section 1.6: getAverage()

The getAverage() method is part of the DoubleSummaryStatistics class and calculates the average of stored values. This can save time for programmers typically writing their own average calculation methods.

Syntax:

DoubleSummaryStatisticsObj.getAverage();

Example:

DoubleSummaryStatistics stats = new DoubleSummaryStatistics();

stats.accept(1);

stats.accept(2);

stats.accept(3);

System.out.println("Average: " + stats.getAverage()); // Output: Average: 2.0

Section 1.7: ensureCapacity()

The ensureCapacity() method is used with the ArrayList class to increase its capacity to hold a specified number of elements.

Syntax:

ArrayList.ensureCapacity(minimumCapacity);

Example:

ArrayList list = new ArrayList<>();

list.ensureCapacity(500);

Section 1.8: absExact()

The absExact() method returns the absolute value of a number, but only if it is representable within its data type (int or long). An ArithmeticException will be thrown if the absolute value causes an overflow.

Syntax:

Math.absExact(number);

Example:

System.out.println(Math.absExact(Integer.MIN_VALUE)); // Throws ArithmeticException