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JAVA伯伯伯100伯伯Math.random()0~1doubleJAVAJAVA伯伯(伯)Java()JAVASOCKET伯伯JAVA伯伯:Hello!Thisisatesttext.:.texttestaisThis!HelloJavatrycatchfinallytry伯catchfinally伯伯JAVA伯伯伯伯abstractclass伯伯伯abstractinterface伯伯staticfinal伯伯STRING伯STRINGBUFFERSTRING伯STRINGBUFFERStringBufferStringStringBuffertoString()final,finallyfinal—伯伯final伯伯finalfinalfinalfinally—finallycatchfinallyCollectionCollectionsCollectionsjava.utilCollectionjava.utilGC?GC?GarbageCollectionGCJavaMath.round(11.5)?Math.round(-11.5)?Math.round(11.5)12Math.round(-11.5)-11;Javagoto?Goto—javajavalength()?Stringlength()?length()lengthStringlength()OverloadOverrideOverloaded?(Overriding)“”(Overloading)OverloadedruntimeexceptionIndexOutOfBoundsExceptionClassCastExceptionerrorexception?errorexception?run()start()?StartConstructoroverride?ConstructorOverrideOverloadString?StringfinalswtichbytelongString?switchexpr1expr1switchcaseintshortcharbytelong,stringswtichvectorVectorJAVAjava.io.Serializablepublic,private,protected,packagepackagepublicprotected×friendly××private×××friendlyArrayListVectorArrayListVector..:VectorArrayList.:,VectorArrayListchar??javaunicodechar16,?,?ThreadRunnablesynchronized,,?:packagetest;publicclassFatherClass{publicFatherClass(){System.out.println(FatherClassCreate);}}:packagetest;importtest.FatherClass;publicclassChildClassextendsFatherClass{publicChildClass(){System.out.println(ChildClassCreate);}publicstaticvoidmain(String[]args){FatherClassfc=newFatherClass();ChildClasscc=newChildClass();}}C:\javatest.ChildClassFatherClassCreateFatherClassCreateChildClassCreate6?packagetest;publicclassOuterClass{privateclassInterClass{publicInterClass(){System.out.println(InterClassCreate);}}publicOuterClass(){InterClassic=newInterClass();System.out.println(OuterClassCreate);}publicstaticvoidmain(String[]args){OuterClassoc=newOuterClass();}}:C:\javatest/OuterClassInterClassCreateOuterClassCreatefloatfloatf=3.4?:伯伯,伯floatf=(float)3.4JAVACollectionFrameWork()?CollectionFrameWork伯CollectionListLinkedListArrayListVectorStackSetMapHashtableHashMapWeakHashMapCollection伯伯Collection伯ObjectCollectionElementsMapkeyvalue伯伯伯classA{publicstaticvoidmain(String[]args){Stringstr=;for(inti=0;i100;i++){str+=(char)i;}System.out.println(str);}}Java1.JavaString2.abccbabbbwlirbbbbbbhhtccc3.IntegerDouble4.19705.6.I/O7.Java8.GB2312ISO-8859-19.JavaStatementPreparedStatement10.JSP&Servlet1.JSPServlet2.WebHTML&“”3.JSPCGIJsp4.CookieSessionSession5.Jsp6.JsperrorPage7.JspJavaBeans8.JSP9.JspServletJ2EE1.J2EEJ2SEJ2SE2.J2EE3.ApplicationServer4.5.Web.xml1.WebBasicSSL2.MVC3.XML4.5.Java6.structs1.xml2.s-EJBe-EJB3.4.cmpbmp5.j2me6.c/sb/s7.connectpool,8.j2eedotnet9.ejblifecycle10.sessionbeanentitybean11.ejbtransaction12.synchronized(13.StringStringBuffer14.Serializable15.MVCStruts16.MDA17.tcpudp18.19.20.ejb21.22.java23.24.25.26.javaawtswingGUI27.java28.awtswing29.java30.appletappletjavaapplicationappletservlet/jsp31.(&,|)(&&,||)32.JavaServerPageServlet33.synchronizedjava.util.concurrent.locks.Lock34.EJBEJB35.java8?36.new?37.classloaderJDKAPIClasspathweb-infclass38.39.40.JVMclass?41.42.java.43.java44.Cjava45.46.“public/private/protected/”47.final48.49.50.JAVAthorws,throw,try,catch,finally51.Object()finalize()52.“.java”53.54.StringTokenizer55.ListCollection56.StringBufferString57.Threaddestroy()58.stop()suspend()59.socket60.JAVALocaleUnicode61.62.63.64.65.66.67.MVC68.GUIFlowLayout,BorderLayout,GridBagLayout69.70.71.JDBC72.EJBBMP,CMP?73.JNDI?74.ADO?ActiveX,.75.JDBC??76.EJB??77.JavaBeanEJB?78.?79.?80.?81.UML,?82.?83.?84.dotnet?85.OracleSGA?86.webservers?87.UNIXQT?88.?89.dotnetJ2EE?90.ActiveX?91.JavaIDL?92.ISO9000CMM?IS09000CMM().CMM1.nreset2.a.txta.txt,JAVA3.publicclassCtest{publicstaticvoidmain(String[]args){System.out.println(6+6+aa+6+6);}}4.1005.(java):{2,10,3,50,78,22,34,30,65}..6.,.7.,,2,,,,oo,:1.,,2.,,,,,3,120……8.VCCforSCOUNIXJava::AtmConfig.txt(4)IP(16)(20)(10)1001192.168.168.11002192.168.168.21003192.168.168.31004192.168.168.4()nATMIPAtmConfignATMAtmCinfignJSPSwing4IPIP:JavaATMd:\atm\etc\AtmConfig.txt9.1publicclassTest2extendsTest1{{System.out.print(1);}Test2(){System.out.print(2);}static{System.out.print(3);}{System.out.print(4);}publicstaticvoidmain(String[]args){newTest2();}}classTest1{Test1(){System.out.print(5);}static{System.out.print(6);}}2publicclassTest3extendsTest4{inti=30;Test3(){print();i=40;}publicstaticvoidmain(String[]args){System.out.println(newTest3().i);}voidprint(){System.out.println(i);}}classTest4{inti=10;Test4(){print();i=20;}voidprint(){System.out.println(i);}}(15)interfaceA{intx=0;}classB{intx=1;}classCextendsBimplementsA{publicvoidpX(){System.out.println(x);}publicstaticvoidmain(String[]args){newC().pX();}}}11.:publicStringtoString(){returnthis+@+this.hashCode();}toString()?(toString)Javafinal,finally,finalizefinal?finalabstractfinalfinalfinalfinalfinally?finallycatchfinallyfinalize?Javafinalize()Objectfinalize()finalize()AnonymousInnerClass()extends()implements()interface()?extends()StaticNestedClassInnerClass