Java Float

Introduction to Java Float

In the overview section we used something called a wrapper class, but what do we mean by that? what is a wrapper class? well, a wrapper class is exactly what it sounds like, its a class wrapped or in better words surrounding your primitive data type so that it can provide you with various fields and methods that might be useful for you and also so that your primitive data type can be passed in your collections such as an ArrayList or a hashmap as an object.

every collection in Java takes in an object and not a primitive value. But now you must be wondering "Hey! that's wrong, I have made ArrayLists of ints so many times". well if you recall, you initialize your ArrayLists something like this.

Here, Integer is not the same as an int, Integer is a wrapper class for the primitive data type int, similarly, if you want to declare an ArrayList of floats, you will do it like this.

But now another question might be coming to your mind. "Okay, so if every collection takes in an object, how come I can add a primitive float to my ArrayList of Float objects??". That's a very good question and the answer is our old friend Java. So when you enter a primitive value inside of a collection, java automatically converts it to an object of the wrapper class of the same type as that of the primitive one with something called Autoboxing so that you don't have to worry about it, isn't it amazing?

now that we know what wrapper classes are and how they are useful, let's go deep inside the java float class and look at all the different fields and methods that it provides us.

Declaration

we have been talking about the java float class for so long, so let's now look at how it has been declared.

to break this declaration down for you, public means that the Float class is available to all the other classes in your program. final means that the float class cannot be extended or inherited. The Float class also extends the Number class and implements the comparable interface to perform basic comparative calculat/ions.

Constructor Summary of Java Float

Before we look at the various fields and methods of the java float class, let's understand how to create one because the java float class has some overloaded constructors.

Field Summary of Java Float

Java float class has some defined fields that we will look at now

You may have noticed that all of these fields are static, which means that they belong to the class rather than any instance of the float class. this also means that want to access any of the above-mentioned fields, you don't necessarily have to make an object of the Float class, you can use the class name directly and use the fields, something like this

if you want to learn more about the static keyword and how static fields and methods work, you can refer to this article by the scaler topics.

Method Summary of Java Float

now we will look at all the different methods that the java float class provides us and try to understand what each one of them does.

As you can see, the java float class provides you with so many methods that you can use in your program according to your needs.

Java Float Examples

Till now in this article, we have looked at various fields and methods that the java float class provides us, but enough with the jargon, let's look at some examples to understand the concepts a little better.

Example 1:

Let's first look at a program using a simple float variable.

Output:

Let's now look at some programs that use java float methods and fields.

Example 2:

In this example, we are going to see a java program that uses the toString() method of the java Float class and then prints the string.

Output:

Example 3:

In this example, we are going to see a java program that creates a float variable and a string variable and then uses the valueOf() method of the java Float class to convert them into a Float value and then prints the results.

Output:

Example 4:

In this example, we are going to look at a java program that declares a string variable and converts it into a Float value by using the parseFloat() method of the java Float class.

Output:

Example 5:

In this example, we will look at a java program that showcases a lot of methods of the java float class that converts the java float variable from one type to another.

Output:

Example 6:

This java program creates a float variable, then creates a Float object using the float variable, and then uses the hashcode() method of the java float class to print the hashcode of the newly created object.

Output:

Example 7:

Float.POSITIVE_INFINITY is a static field in the java float class and it gives us a constant that holds the positive infinity value for the Java float object. Here is a Java program that will show you the field and this program also uses the isInfinite() method of the java float class.

Output:

Example 8:

In this example we will look at a java program that uses the equals() method of the java float class and used to compare two Float objects and returns true or false.

Output:

Example 9:

In this example, we will look at a java program that uses the compareTo() method of the java Float class which is also used to compare two Float objects just like the equals() method but return 1 if the first object is greater than the second object, returns 0 if both the objects are equal and returns -1 if the first object is smaller than the second object.

Output: