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1、Java初学者程序代码BeginnerJavaneedtomasterthemostbasiccode:Example1.1,thisprogramcandisplaytextonthescreen,"welcomeyoutolearnJavalanguage.，z!〃・Openatexteditorandenterthefollowingcode:Public,class,Hello{Public,static,void,main(String,args[]){System・out.printin(welcometolearnJavalanguage!
2、);X}IExample2.1toprepareasimpleJavaApplicationsource:Welcome2・java・Theresultoftheprogram'soutputisaword"welcometoJavaasshowninfigure2.1.//thisisasimpleJavasourceprograminApplicationClassWelcome2{xPublicstaticvoidmain(String:args){xSystem・out・println("welcometoJava，zin2);Themainme
3、thoddefinedin}//endTheendofclassWelcome2}//definitionExample2.2identifiers,keywords,andseparators・PublicclassExample{xPublicstaticvoidmain(String:args){xInti,inC：In.・・X}}Example2.3variabledeclarationexample・CompileandruntheprogramusingSDK,andtheresultsareshowninfigure2.2.Publiccl
4、assV{xPublicstaticvoidmain(String:args){xByteinb二0x55;Shortins=0x55ff;Intini二1000000;Longinl=0xffffL;Charc二in'C';Floatinf=0.23F;Doubleind二0.7E-3;BooleaninB二true;StringS二"Thisisinstring;inSystem・out・printin二+b〃bytetypevariablex);System・out・printin(〃s+s〃shortint二x);System・out・print
5、in(I二〃+i〃intx);System・out・printin(〃L二+1〃longintegervariablex);System・out・printin(〃C二+c〃charactervariables);simulationSystem・out・printin(〃F〃二+ffloating-pointvariablex);System・out・printin(〃d二+d〃doubleprecisionvariablex);System・out・printin(〃B二+B〃Booleanvariables);simulationSystem・ou
6、t・printin(〃S二+S〃stringclassobjectin);Scopeofuseofexample2.4variables.PublicclassV2{xStaticintini二10;Publicstaticvoidmain（String:args）{xIntink=10：System.out.printin（〃i二"in+i）;System・out・printin（〃k二"in+k）;X}System・out・printin（〃k二"in+k）;//compiletimewillgowrong,isoutofthescopeofusin
7、gtheKin}Example2.5.Thefollowingprogramillustrateshowtherelationaloperatorandlogicaloperatorareused,andtheoutputisshowninfigure2.4.InPublicclassRAL{xPublicstaticvoidmain(String:args){xInt3=25,b=3,e=3,f=0;in布尔a
8、5)系统。岀来。printin二〃+/E)；如果(f)!二F>5)系统。岀来。p
