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1、JavaCommentsC#//Singleline/*Multiple line *//**Javadocdocumentationcomments*///Singleline/*Multiple line *////XMLcommentsonasingleline/**XMLcommentsonmultiplelines*/JavaDataTypesC#PrimitiveTypesbooleanbytecharshort,int,longfloat,doubleReferenceTypesObject (superclassofallotherclasses
2、)Stringarrays,classes,interfacesConversions//inttoStringintx=123;Stringy=Integer.toString(x); //yis"123"//Stringtointy="456"; x=Integer.parseInt(y); //xis456// doubletointValueTypesboolbyte,sbytecharshort,ushort,int,uint,long,ulongfloat,double,decimalstructures,enumerationsReferenceTypes
3、object (superclassofallotherclasses)stringarrays,classes,interfaces,delegatesConvertions//inttostringintx=123;Stringy=x.ToString(); //yis"123"//stringtointy="456";x=int.Parse(y); //orx=Convert.ToInt32(y);doublez=3.5;x=(int)z; //xis 3 (truncatesdecimal)// doubletointdoublez=3.5;x=(int)
4、z; // xis 3 (truncatesdecimal)JavaConstantsC#//MaybeinitializedinaconstructorfinaldoublePI=3.14;constdoublePI=3.14;//Canbesettoaconstoravariable.Maybeinitializedinaconstructor.readonlyintMAX_HEIGHT=9;JavaEnumerationsC#enumAction{Start,Stop,Rewind,Forward};//SpecialtypeofclassenumStatus{
5、Flunk(50),Pass(70),Excel(90); privatefinalintvalue; Status(intvalue){this.value=value;} publicintvalue(){returnvalue;}};Actiona=Action.Stop;if(a!=Action.Start) System.out.println(a); //Prints"Stop"Statuss=Status.Pass;System.out.println(s.value()); //Prints"70"enumAction{S
6、tart,Stop,Rewind,Forward};enumStatus{Flunk=50,Pass=70,Excel=90};Noequivalent.Actiona=Action.Stop;if(a!=Action.Start) Console.WriteLine(a); //Prints"Stop"Statuss=Status.Pass;Console.WriteLine((int)s); //Prints"70"JavaOperatorsC#Comparison== < > <= >= !=Arithmetic+ - * /% (m
7、od)/ (integerdivisionifbothoperandsareints)Math.Pow(x,y)Assignment= += -= *= /= %= &=
8、= ^= <<= >>= >>>= ++ --Bitwise&
9、 ^ ~ << >> >>>Logical&&
10、
11、 &
12、 ^ !Note:&&and
13、
14、 performshort-circuitlogicalevaluationsStringConcatenation+Comparison== < > <= >= !=Arithmetic+
