Java: 24 Hours to Java - Java for Beginners with Step by Step Hands-on Coding Projects and Examples by Scott Gary

Author:Scott Gary [Gary, Scott]
Language: eng
Format: azw3, epub
Published: 2019-06-11T16:00:00+00:00

Comparison Operators

There are many different so – called "comparison operators" that allow for two values to be compared in order for Java to be able either a True or False result in order to evaluate the if statement created by the programmer. Note that the data types of the values must be the same for them to be evaluated, or else the Java program will simply return an error result. It is also important to note that even more complex data types such as strings or arrays can be compared, and will return a result based on which string is "alphabetically lesser", meaning which word comes before it in the dictionary.

The first comparison operator that the up – and - coming computer programmer should be aware of is the '==' operator. This just means "equal to", and will return a result of True if the values are exactly equal, and will return a False result if not. This means that an “==” comparison between two different data types may result in an unexpected False result due to its nature. For example, a float variable containing 0.0, while technically equal to an int variable containing 0, will return False if compared, thanks to them being not exactly equal. The equal to comparison operator needs two equal signs put together, as the singular equal sign ("=") is used in order to assign values.

The next operator is "!=", which means not equal to, meaning that if the values differ in any way, the statement will be evaluated as False . This is a better way to compare values of different variable types, as it accounts for possible differences due to the way these variables store their values.

The next comparison operator is the ">", or the greater than sign. If the value stored in the left variable is greater than the value in the right variable, then the statement will return a result of True , but if not, it will return a false result.

The next comparison operator is the "<", or the less than sign. If the value in the left side of the statement is lesser than the value on the right side of the statement, then the whole line will return a result of True , else it will return a false result.

The next comparison operator is a combination of two operators, the ">=", meaning greater than or equal to. This means that if the value on the left is greater than or equal to, the statement will evaluate as true , else it will return a false result.

The last comparison operator is a combination of two operators as well, the "<=", meaning less than or equal to. This means that if the value on the left of the operator is less than or equal to the value of the statement to the right of the operator, the statement will evaluate as true , else it will return a false result.

Let's try and put the if statement into practice with the

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