gistfile1.java

// first iteration: simple guard by version string
if(isRubyVersion("1.9.2-p136")){
// ....
}

// second iteration: Version object with semantic versioning, etc
RubyVersion v = version("1.9.2-p136");

v.major() // 1.9
v.minor() // 2
v.patchlevel() // 136

v.is1_9() // true (for compat) 

v1 = version("1.9.2-p137");

v > v1 // false

gistfile2.txt