list of keywords in java

Get a list of all Java reserved Keywords

stackoverflow.com › questions › 24265110 › get-a-list-of-all-java-reserved-keywords

From axis.apache.org

Basically, Pre-Sort the keywords and store it in an array and using Arrays.binarySearch on your keyword for the good'ol O(logn) complexity

import java.util.Arrays;

    public class MainDemo {
        static final String keywords[] = { "abstract", "assert", "boolean",
                "break", "byte", "case", "catch", "char", "class", "const",
                "continue", "default", "do", "double", "else", "extends", "false",
                "final", "finally", "float", "for", "goto", "if", "implements",
                "import", "instanceof", "int", "interface", "long", "native",
                "new", "null", "package", "private", "protected", "public",
                "return", "short", "static", "strictfp", "super", "switch",
                "synchronized", "this", "throw", "throws", "transient", "true",
                "try", "void", "volatile", "while" };

        public static boolean isJavaKeyword(String keyword) {
            return (Arrays.binarySearch(keywords, keyword) >= 0);
        }

        //Main method
        public static void main(String[] args) {
            System.out.println(isJavaKeyword("void"));

        }

    }

Output:

True

Alternatively, as users @typeracer,@holger suggested in the comments, you can use SourceVersion.isKeyword("void") which uses javax.lang.model.SourceVersion library and Hashset Data structure internally and keeps the list updated for you.

Answer from Ravi Yenugu on Stack Overflow

Igmguru

igmguru.com › blog › java-keywords

Java Keywords – 68 Java Keywords Explained

4 weeks ago - The following keywords are used in this code: public: This access modifier helps to make sure that classes, methods or variables are accessible from any other class. It is important for the Java Virtual Machine (JVM) to start the program. class: This keyword is used to declare a class and works as a blueprint for creating objects. Nearly all code of this programming language resides within classes.

Oracle

docs.oracle.com › javase › tutorial › java › nutsandbolts › _keywords.html

Java Language Keywords (The Java™ Tutorials > Learning the Java Language > Language Basics)

See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases. See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases. Here is a list of keywords in the Java programming language.

Discussions

regex - Get a list of all Java reserved Keywords - Stack Overflow

I need to do a name validation ... to any java keywords. Is there a specific way of retrieving all the keywords into one data structure? or do I need to just build a regex string with all these keywords in it : "for|while|if|..." and try and match my string against it? ... @Kabulan0lak yeah, I know of the list, I want to ... More on stackoverflow.com

stackoverflow.com

What is the most common keywords in writing a Java program?

From one of my java project, https://github.com/DropSnorz/OwlPlug : 154 class 162 null 208 true 266 void 304 for 334 if 462 new 500 return 503 private 540 String 596 this 766 public 1293 import Just counted all words regardless if they are in code or part of comments and Javadoc. More on reddit.com

r/javahelp

August 11, 2020

Need a detailed understanding of the keywords in the beginning of any java programming.

void means the method doesn't return a value. You can have a method declared void kickRocks() and if it is void, you can just call it. It doesn't provide a value, it just kicks the rocks. kickRocks(); If you have a method that does return a value, then it needs to return that value. int breakRocks() may return how many rocks are broken. You can use that value. count = count + breakRocks(); Or you can ignore the return value. breakRocks(); But either way, it needs to fulfill its return value. Static has more than one place it might get used, but for fields or methods, it means that thing belongs to the class itself and not the instances of the class. Your Rocks class allows rocks of three sizes, so when you make a Rock myRock = new Rock(RockSize.SMALL), you get an instance of Rock that probably has a field that stores its size. Each instance of a Rock gets its own size. However, if the Rock class also needs to keep a list of all rocks and let you know how many rocks have been made, that list isn't a separate list for each instance of a rock, its for the class itself, so that list is static, which means there is only one list, not a seperate rock list for each rock. String[] args is an array of strings so if the program is run from the command line, it can access all the arguments passed in that command line. If you aren't running your stuff from a command line, you can probably just ignore the args. It needs to be there, but you don't have to use them. More on reddit.com

r/javahelp

December 29, 2021

new to java looking for list of statements/commands.

Here are all the keywords in java:

https://docs.oracle.com/javase/tutorial/java/nutsandbolts/_keywords.html

Part of the Oracle Learning the Java Language tutorials:

https://docs.oracle.com/javase/tutorial/java/TOC.html

The Java 8 Docs include all the classes that exist in JDK8

https://docs.oracle.com/javase/8/docs/api/

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