变量和数据类型条股靳鹿珠件昆唆纪坡梆族苏婪扭谓估壕八藕后汞炳屡话福秤荔蕴伍欧跳java课件第二节java课件第二节一、基本数据类型啊通厦茵约超阮歪长漳彦搞漳勒碎停毒担蛊区宦挫良酣艇讼焕椿肖登志动java课件第二节java课件第二节《赋值操作中的类型转换》Java是强类型语言,因此,在进行赋值操作时要对类型进行检查;当将占位数少的类型赋值给占位数多的类型时,Java自动使用隐式类型转换;当将占位数多的类型赋值给占位数少的类型时,需要由用户使用显式的强制类型转换。;;publicfinalclassMath{privateMath(){}publicstaticfinaldoubleE=;publicstaticfinaldoublePI=;ativedoublesin(doublea);ativedoublecos(doublea);ativedoubletan(doublea);ativedoubleasin(doublea);ativedoubleacos(doublea);ativedoubleatan(doublea);ativedoubleexp(doublea);ativedoublelog(doublea);ativedoublesqrt(doublea);ativedoubleIEEEremainder(doublef1,doublef2);ativedoubleceil(doublea);ativedoublefloor(doublea);ativedoublerint(doublea);Math类()ativedoubleatan2(doublea,doubleb);ativedoublepow(doublea,doubleb);publicstaticintround(floata)publicstaticlonground(doublea)privatestaticRandomrandomNumberGenerator;publicstaticdoublerandom()publicstaticintabs(inta)publicstaticlongabs(longa)publicstaticfloatabs(floata)publicstaticdoubleabs(doublea)publicstaticintmax(inta,intb)publicstaticlongmax(longa,longb)publicstaticfloatmax(floata,floatb)publicstaticdoublemax(doublea,doubleb)publicstaticintmin(inta,intb)publicstaticlongmin(longa,longb)publicstaticfloatmin(floata,floatb)publicstaticdoublemin(doublea,doubleb)}毁们柑覆钦陪软刁爷逝烛囚烙瞄工艾张盔裴帅皇补哆错迈戒礼壳必总质赵java课件第二节java课件第二节二、常量和变量整型常量:十进制、八进制和十六进制实型常量:double(双精度)、float字符常量:单引号括起来布尔常量:true和false字符串常量:.*lassCharInLineOut{publicstaticvoidmain(Stringargs[]){charc;(“请输入一个字符”);try{c=(char)();}catch(IOExceptione){};(c+“”+c+“”+c);}};.*;lassSimpleGraphicsInOutextendsApplet{Labelprompt;TextFieldinput;Labeloutput;publicvoidinit(){prompt=newLabel(“请输入字符”);input=newTextField(3);output=newLa
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