Groovy與Java的區別驗證
> //groovy與java的區別
> //1、語句結尾的分號可省略,回車換行區分(待驗證)
> //2、方法的最後一行會作爲返回值返回(待驗證)
> //3、自動爲屬性添加getter、setter方法(待驗證)
> //4、可以直接用對象.屬性名獲取私有屬性(待驗證)
> //5、==比較null不會報空指針異常(待驗證)
執行結果 (證明1、4正確)
> public class MyProject{
> private int major
> private int minor
>
> public MyProject(int major,int minor){
> this.major = major
> this.minor = minor
> }
> }
>
> MyProject project = new MyProject(1,2)
> println project.major
1
執行結果(證明3是錯誤)
> public class MyProject{
> private int major
> private int minor
>
> public MyProject(int major,int minor){
> this.major = major
> this.minor = minor
> }
> }
>
> MyProject project = new MyProject(1,2)
> println project.getMinor()
groovy.lang.MissingMethodException: No signature of method: MyProject.getMinor() is applicable for argument types: () values: []
Possible solutions: iterator(), getClass()
at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:58)
at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:54)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
at ideaGroovyConsole.run(ideaGroovyConsole.groovy:18)
at groovy.lang.GroovyShell.runScriptOrMainOrTestOrRunnable(GroovyShell.java:263)
at groovy.lang.GroovyShell.run(GroovyShell.java:518)
at groovy.lang.GroovyShell.run(GroovyShell.java:497)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.groovy.runtime.callsite.PogoMetaMethodSite$PogoCachedMethodSite.invoke(PogoMetaMethodSite.java:169)
執行結果(證明3錯誤,2正確)
> public class MyProject{
> private int major
> private int minor
>
> public MyProject(int major,int minor){
> this.major = major
> this.minor = minor
> }
>
> public int getMinjor(){
> minor
> }
> }
>
> MyProject project = new MyProject(1,2)
> println project.getMinjor()
2
總結:
groovy與java的區別
1、語句結尾的分號可省略,回車換行區分
2、方法的最後一行會作爲返回值返回
3、可以直接用對象.屬性名獲取私有屬性
5、==比較null不會報空指針異常(java也不會,但是goovy的==是調用Object的equals,這個類比Objects的equals)