[memo] Java FizzBuzz Code Golf

Java FizzBuzz Code Golf

• Note what seems to be the shortest code for FizzBuzz in each version of Java.
• Basically java and javac are used as a set
• As with normal code golf, ignore standard error output
• Basically, do not add a line break at the end of the code (to reduce the number of characters)

Java1.4.2 (105char)

A.java

class B{static{for(int i=0;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i+"":"":"Buzz"));}}

• In the Java1.4.2 era, ternary operators must be of the same type to result in a compilation error.
• The static initializer works even if there is no main method in class. However, I get an error message

$ java -version
java version "1.4.2_19"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_19-b04)
Java HotSpot(TM) Client VM (build 1.4.2_19-b04, mixed mode)
$ javac -version
javac: -version is an invalid flag.
How to use: javac <options> <source files>
The available options are:
  -g Generate all debug information
  -g:none Do not generate debug information
  -g:{lines,vars,source}Generate only some debug information
  -nowarn do not raise a warning
  -Print a message about the behavior of the verbose compiler
  -deprecation Prints the location of sources where deprecated APIs are used
  -classpath <path>Specify the location to search for user class files
  -sourcepath <path>Specify the location to search the input source file
  -bootclasspath <path>Replace the location of bootstrap class files
  -extdirs <dirs>Replace the location of installed extensions
  -d <directory>Specify the location to store the generated class file
  -encoding <encoding>Specifies the character encoding used by the source file
  -source <release>Maintain source compatibility with the specified release
  -target <release>Generate class files for a particular VM version
  -help Print a summary of standard options

$ echo -n 'class B{static{for(int i=0;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"));}}' > A.java
$ javac A.java
A.java:1: ?Incompatible type for:Neither is a subtype of the other.
Second operand: int
Third operand: java.lang.String
class B{static{for(int i=0;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"));}}
                                                                                     ^
A.java:1: ?Incompatible type for:Neither is a subtype of the other.
Second operand: int
Third operand: java.lang.String
class B{static{for(int i=0;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"));}}
                                                                               ^
2 errors
$ echo -n 'class A{static{for(int i=0;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i+"":"":"Buzz"));}}' > A.java
$ wc -c
105 A.java
$ javac A.java
$ java A
1
2
Fizz
4
Buzz
(Omitted)
97
98
Fizz
Buzz
Exception in thread "main" java.lang.NoSuchMethodError: main

• It seems that javac doesn't have the -version option in the Java1.4.2 era

Java5～Java6 (96char)

A.java

enum A{B;int i;{for(;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"));}}

• Shortest recording time in java
• I get an error message at runtime, but it works without the main method
• Shorter with ʻenum` added in Java5

$ java -version
java version "1.5.0_22"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_22-b03)
Java HotSpot(TM) Client VM (build 1.5.0_22-b03, mixed mode, sharing)
$ javac -version
javac 1.5.0_22
javac:There is no source file.
How to use: javac <options> <source files>
The available options are:
  -g Generate all debug information
  -g:none Do not generate debug information
  -g:{lines,vars,source}Generate only some debug information
  -nowarn do not raise a warning
  -Print a message about the behavior of the verbose compiler
  -deprecation Prints the location of sources where deprecated APIs are used
  -classpath <path>Specify the location to search for user class files
  -cp <path>Specify the location to search for user class files
  -sourcepath <path>Specify the location to search the input source file
  -bootclasspath <path>Replace the location of bootstrap class files
  -extdirs <dirs>Replace the location of installed extensions
  -endorseddirs <dirs>Replace recommended standard path location
  -d <directory>Specify the location to store the generated class file
  -encoding <encoding>Specifies the character encoding used by the source file
  -source <release>Maintain source compatibility with the specified release
  -target <release>Generate class files for a particular VM version
  -version Version information
  -help Print a summary of standard options
  -X Print a summary of non-standard options
  -J<flag>                   <flag>Pass directly to the execution system

$ echo -n 'enum A{B;int i;{for(;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"));}}' > A.java
$ wc -c A.java
96 A.java
$ javac A.java
$ java A
1
2
Fizz
4
Buzz
(Omitted)
97
98
Fizz
Buzz
Exception in thread "main" java.lang.NoSuchMethodError: main

• In the Java5 era, javac had -version, but omitting the source file makes me angry.

Java7 (130char)

A.java

class A{public static void main(String[]a){for(int i=0;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"));}}

• Up to Java6, it worked with the static initializer without main (with an error), but from Java7 it stopped working.
• The longest and most straightforward code time

$ java -version
java version "1.7.0_80"
Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
Java HotSpot(TM) Client VM (build 24.80-b11, mixed mode, sharing)
$ javac -version
javac 1.7.0_80
$ echo -n 'enum A{B;int i;{for(;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"));}}' > A.java
$ javac A.java
$ java A
error:The main method cannot be found in class A. Define the main method as follows:
   public static void main(String[] args)
$ echo -n 'class A{public static void main(String[]a){for(int i=0;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"));}}' > A.java
$ wc -c A.java
130 A.java
$ javac A.java
$ java A
1
2
Fizz
4
Buzz
(Omitted)
97
98
Fizz
Buzz

Java8 or later (127char)

A.java

interface A{static void main(String[]a){for(int i=0;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"));}}

• Since the main method can be written in ʻinterface and public` is no longer needed, it is a little short.

$ java -version
java version "1.8.0_212"
Java(TM) SE Runtime Environment (build 1.8.0_212-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.212-b10, mixed mode)
$ javac -version
javac 1.8.0_212
$ echo -n 'interface A{static void main(String[]a){for(int i=0;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"));}}' > A.java
$ wc -c A.java
127 A.java
$ javac A.java
$ java A
1
2
Fizz
4
Buzz
(Omitted)
97
98
Fizz
Buzz

Jshell (83char)

int i;for(;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"))

• Jshell version available from Java9

$ jshell --version
jshell 11.0.3
$ echo -n 'int i;for(;i++<100;)System.out.println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"))' | jshell -
1
2
Fizz
4
Buzz
(Omitted)
97
98
Fizz
Buzz

Jshell PRINTING version (72char)

int i;for(;i++<100;)println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"))

• I don't know the details of jshell's code golf regulation, but somehow the PRINTING version
• Simply remove System.out.

$ echo -n 'int i;for(;i++<100;)println((i%3>0?"":"Fizz")+(i%5>0?i%3>0?i:"":"Buzz"))' | jshell PRINTING -
1
2
Fizz
4
Buzz
(Omitted)
97
98
Fizz
Buzz