大名鼎鼎的java动态脚本语言。已经通过了sun的认证

				public class DownUpStepTest extends GroovyTestCase {								    void testDownto() {				        def z = []				        (10.5).downto(5.9) { z 				        assertEquals( [10.5, 9.5, 8.5, 7.5, 6.5], z)				    }								    void testBigIntegerDowntoBigDecimal() {				        def z = []				        10G.downto(5.9G) { z 				        assertEquals( [10G, 9G, 8G, 7G, 6G], z)				    }								    void testUpto() {				        def z = 0.0				        (3.1).upto(7.2) { z += it }				        assert z == 3.1 + 4.1 + 5.1 + 6.1 + 7.1				        assert z == 25.5				    }								    void testStep() {				        def z = 0.0				        (1.2).step(3.9, 0.1) { z += it }				        assert z == 67.5				    }								    void testDownStep() {				        def z = 0.0				        (3.8).step(1.1, -0.1) { z += it }				        assert z == 67.5				    }				}