ToJava10

Translate java source code to use jdk's 10 var keyword.

Uses the venerable ANTLR for generating the parser and the listeners.

Build

Build the jar or download from the releases(when available):

mvn package

ls -la target/
...
toJava10.jar

Usage

Point it at some java class, by default the change goes to stdout:

java -jar target/toJava10.jar src/main/resources/Simple.java

/**
 * A simple java class with 2 local variables declaration in the constructor.
 * A test should use those for conversion to 'var' and  analyze the result.
 */
public class Simple {

    private int x = 42;

    public Simple() {
        // foo comment
        var age = 1;
        var map = new ConcurrentHashMap<>();
    }
}

Add -i to write the changes to the file in-place:

java -jar target/toJava10.jar -i src/main/resources/Simple.java

Convert your whole git repo:

git ls-files '*.java' | xargs -I '{}' java -jar target/toJava10.jar -i '{}'