大名鼎鼎的java动态脚本语言。已经通过了sun的认证

				class NegationTests extends GroovyTestCase {								    void testNegateInteger() {				        def a = -1				        assert a == -1				    }								    void testNegateIntegerExpression() {				        def a = -1				        a = -a				        assert a == 1				    }								    void testNegateDouble() {				        def a = -1.0				        assert a == -1.0				    }								    void testNegateDoubleExpression() {				        def a = -1.0				        a = -a				        assert a == 1.0				    }								}