How to find length of long in Java

Mike 46 Published: 11/06/2024

How to find length of long in Java

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To find the length of an array or a string (which is often referred to as "long" in programming parlance) in Java, there are several ways to do so. Here are some approaches:

Using the length property for arrays and strings: In Java, you can directly use the length property to find the length of an array or string. 
int[] myArray = {1, 2, 3};

System.out.println("Length of array: " + myArray.length);


String myString = "Hello";


System.out.println("Length of string: " + myString.length);

In this case, the length property returns an integer representing the number of elements in the array or the number of characters in the string.

Using a loop to count the elements: Another way to find the length is by using a loop that counts the number of elements: 
int[] myArray = {1, 2, 3};

int length = 0;


for (int i : myArray) {


length++;


}


System.out.println("Length of array: " + length);


String myString = "Hello";


length = 0;


for (char c : myString.toCharArray()) {


length++;


}


System.out.println("Length of string: " + length);

In this case, the loop iterates over each element in the array or character in the string and increments a counter variable (length) until it reaches the desired count.

Using Java 8's Stream API: If you're using Java 8 or later, you can use the Stream API to find the length of an array or string: 
int[] myArray = {1, 2, 3};

int length = (int) Arrays.stream(myArray).count();


System.out.println("Length of array: " + length);


String myString = "Hello";


length = (int) myString.chars().count();


System.out.println("Length of string: " + length);

In this case, the Arrays.stream() method creates a stream from an array, and the chars() method does the same for a string. The count() method then returns the number of elements in the stream, which represents the length.

Using Apache Commons Lang's ArrayUtils: Another option is to use third-party libraries like Apache Commons Lang. You can import the ArrayUtils class and use its length() method: 
import org.apache.commons.lang.ArrayUtils;

int[] myArray = {1, 2, 3};


System.out.println("Length of array: " + ArrayUtils.length(myArray));


String myString = "Hello";


System.out.println("Length of string: " + ArrayUtils.length(new String[]{myString}.clone()));

In this case, the length() method returns an integer representing the number of elements in the array.

These are some of the ways you can find the length of an array or string (often referred to as "long") in Java. Each approach has its own advantages and disadvantages, depending on your specific requirements.

Size of float in Java

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In Java, the float data type is a single precision floating-point number. It has a total of 32 bits, which are divided into three parts:

Sign bit (1 bit): This bit indicates whether the number is positive or negative. Exponent (8 bits): This part represents the power of 2 that the number should be multiplied by. The exponent is biased, meaning it's offset by a certain value to make calculations easier. In this case, the bias is 127, which means the actual exponent range is -126 to +125. Mantissa (23 bits): This part represents the fractional part of the number. It has an implicit leading 1, so it's effectively 24 bits.

Here's a breakdown of the size and precision of float in Java:

Size: 32 bits Precision: Single precision floating-point, approximately 6-7 decimal digits (e.g., 0.123456) Range: Minimum value: Approximately -3.4 × 10^38 (negative infinity) Maximum value: Approximately 1.4 × 10^38 (positive infinity)

In practice, the actual range of values that can be represented by a float depends on the specific implementation and the platform you're running Java on.

It's worth noting that while float has a smaller size than double, which is a double precision floating-point number, it still provides a good balance between accuracy and memory usage for many applications. In fact, most graphics programming and games use float values to store coordinates, colors, and other numerical data.

However, if you need higher precision or more extensive range of values, you may want to consider using double (64 bits) or even long double (80 bits) instead.

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