大名鼎鼎的java动态脚本语言。已经通过了sun的认证

				class UnaryMinusTest extends GroovyTestCase {								    void testUnaryMinus() {				        def value = -1				        				        assert value == -1				        				        def x = value + 2				        assert x == 1				        				        def y = -value				        assert y == 1				    }   				    				    void testBug() {				        def a = 1				        def b = -a				        				        assert b == -1				    }				    				    void testShellBug() {				        assertScript("""				def a = 1				def b = -a				assert b == -1            				""")				    }				}