Java program as identifiers

As already mentioned, Java identifiers has to follow the same rules for creation. If they are not followed, compile-time errors can occur. The rules are explained below. Here, eventhough const and goto are not part of the Java language, they are considered as keywords.

At the same time, in the case of Variable names and method names, the lower case is followed. Similar to the above situation, the camel case will be followed if multiple words are used. Normally, many people consider identifiers as variables only. But the true fact is that an identifier can be a class name, package name, method name etc.

For example, let us see the below code. Here, each and every word in the code is considered as an identifier. It is due to the fact that keywords and literals are already predefined. Suppose a program defines a keyword as an identifier, as shown below, and we are trying to compile it. Java reserved keywords are predefined words, which are reserved for any functionality or meaning. We can not use these keywords as our identifier names, such as class name or method name.

These keywords are used by the syntax of Java for some functionality. If we use a reserved word as our variable name, it will throw an error. Although the const and goto are not part of the Java language; But, they are also considered keywords.

We should follow some naming convention while declaring an identifier. However, these conventions are not forced to follow by the Java programming language. That's why it is called conventions, not rules. But it is good to follow them. These are some industry standards and recommended by Java communities such as Oracle and Netscape.

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