Create a Groovy class dynamically

Question

Given a class name I would like to dynamically create a Groovy class add properties and methods to it. I create the new class using

instance = this.class.cla         


        

Answer 1

a nice variant would be to use the GroovyShell.

def c = """ 
package de.myCorp.test

class Test {
    def a
    def b
    def c    

    Test(String c){ this.c = c}

    public String greet(){
        return "hello "+a
    }

    public void count(){
        (1..4).each{
            println it
        }
    }

}

def class UsingTest {
    Test mytest = null

    UsingTest (Test test){  this.mytest = test }

    def using(){
        mytest.greet();
    }

}
"""


GroovyShell gs = new GroovyShell()
//I hope this is not a too bad hack ^^ 
def erg = gs.evaluate(c+";['test':Test, 'using':UsingTest];")

def testclass = erg["test"].newInstance("Charlotte on Ice")
    testclass.a = "hugo"
    testclass.b = "sepp"


testclass.count() 
assert testclass.greet() == "hello hugo"

assert testclass.c == "Charlotte on Ice"
assert testclass.class.name == "de.myCorp.test.Test"


def usingclass = erg['using'].newInstance(testclass)
usingclass.mytest.a = "Fritzl"
assert usingclass.using() == "hello Fritzl" 

...and especially notice the GroovyShell.evaluate(URI uri) types... GroovyShellDoc