Groovy动态语言 运行在JVM中的动态语言 可以方便的处理业务逻辑变化大的业务

				class PlusEqualsTest extends GroovyTestCase {
				
				    void testIntegerPlusEquals() {
				        def x = 1
				        def y = 2
				        x += y
				        
				        assert x == 3
				        
				        y += 10
				        
				        assert y == 12
				    }
				
				    void testCharacterPlusEquals() {
				        Character x = 1
				        Character y = 2
				        x += y
				        
				        assert x == 3
				        
				        y += 10
				        
				        assert y == 12
				    }
				    
				    void testNumberPlusEquals() {
				        def x = 1.2
				        def y = 2
				        x += y
				        
				        assert x == 3.2
				        
				        y += 10.1
				        
				        assert y == 12.1
				    }
				    
				    void testStringPlusEquals() {
				        def x = "bbc"
				        def y = 2
				        x += y
				        
				        assert x == "bbc2"
				        
				        def foo = "nice cheese"
				        foo += " gromit"
				        
				        assert foo == "nice cheese gromit"
				    }
				}