java程序设计案例教程源码项目2第二章

packagepublicclassLX21publicstaticvoidmain(String[]args)//TODOAuto-generatedmethodintadoublefloatchar packagepublicclassLX22publicstaticvoidmain(String[]args)intdoublefloatd= packagepublicclassLX24publicstaticvoidmain(String[]args) inta= intb=System.out.println("a="+System.out.println("b="+ packagepublicclassLX25publicstaticvoidmain(String[]args) intbooleand=booleane=System.out.println("d="+System.out.println("e="+ publicclassLX26publicstaticvoidmain(String[]int //先赋值，然后变量再增加（a1="+ int //a10赋给b，a1intc //a1111212System.out.println("a="+a+"b="+b+"c="} 2-6】理解复合赋值运算符。publicclassLX27publicstaticvoidmain(Stringint //a9，b //a=a+b，a 2-7】给出一个四位数，逆序输出这个数。publicclasspublicstaticvoidmain(String[]args)intnum=5426，xnum;//变量num存放一个四位数，xnum存放新int int int int System.out.println("逆序后的数： packagepublicclassLX23publicstaticvoidmain(String[]args)doublea5double6doubleperimeter=(a+b)*7doublearea=a*8System.out.println("长方形的周长是：perimeter米9System.out.println("长方形的面积是：area平方米} packageimportpublicclassLX29publicstaticvoidmain(String[]args)int Scannerscanner=newa= b= } 2-1060以上（60分，并显示相关提示信息。importpublicclasspublicstaticvoidmain(Stringintif(score 6789 }packageimportpublicclassLX211publicstaticvoidmain(String[]args)int Scannerscanner=new78 9 }}} 2-12Java程序，以判packageimportpublicclassLeapYearpublicstaticvoidmain(String[]args)Scannerscanner=newintyear 8if((year%4==0&&year%100!=0)||9} packagepublicclassLX213publicstaticvoidmain(String[]args)4int567else89y=-} packagepublicclassTestSwitchpublicstaticvoidmain(String[]args)//TODOAuto-generatedmethodintscore=switch casecasecasecasecase 2-16】分析程序理解whilepackagepublicclassLX216publicstaticvoidmain(String[]args)int 678}9} packagepublicclassTestWhilepublicstaticvoidmain(String[]args)//TODOAuto-generatedmethod 6789} packagepublicclassTestdoWhilepublicstaticvoidmain(String[]args) 前需要给fact设置初始值，以后不断在fact10为止。packagepublicclassTestDoWhile2publicstaticvoidmain(String[]args)//TODOAuto-generatedmethodintlong 2-20for100packagepublicclassTestForpublicstaticvoidmain(String[]args)//TODOAuto-generatedmethodint packagepublicclassTestForFactpublicstaticvoidmain(String[]args)//TODOAuto-generatedmethodintlonglongfact packagepublicclassTestBreakpublicstaticvoidmain(String[]args)//TODOAuto-generatedmethodfor(int 【例2-23】测试使用的break语句。publicclasspublicstaticvoidmain(String[]args) //外层循环，outerfor(inti=0;i<5;i++for(intj0;j3;j System.out.println("i的值为:"+i+ j的值为:"+if(j==break //跳出outer所标识的循环 packageimportpublicclassPrimeTestpublicstaticvoidmain(String[]args)//TODOAuto-generatedmethodScannersc=newSystem.out.println("请输入一个自然数intintfor( if(num%i==0 } 2-251007packagepublicclassTestContinuepublicstaticvoidmain(String[]args)//TODOAuto-generatedmethodfor(int6 7System.out.print(i+"8}9 }packageimportpublicclassTestContinue2publicstaticvoidmain(String[]args)//TODOAuto-generatedmethodScannersc=newint //numint int for(int("score= //70 System.out.println("全班大于等于70分的学生比例为"+((float)count/ 2-27publicclasspublicstaticvoidmain(String[]args)34for(inti=0;i5for(intj=0;j<3;System.out.println("i的值为:"+i+ j的值为:"+if(j==continue //跳出outer所指定的循环} packagepublicclassLX226publicstaticvoidmain(String[]args)4//TODOAuto-generatedmethod5for(inti=1;i<=2;i++)6for(int7System.out.println(i+"8}9 }2-273～100之间的所有素数。packagepublicclassMulPrimeTestpublicstaticvoidmain(String[]args)//TODOAuto-generatedmethodintintfor(intnum=3;num<=100;num for( //forif9if(num%i==0)if(i==num)System.out.print//10System.out.println("}}} packagepublicclassLX228publicstaticvoidmain(String[]args)//TODOAuto-generatedmethodfor(inti=1;i<=6;i for(int System.out.print("*System.out.println packagepublicclassLX229publicstaticvoidmain(String[]args)//TODOAuto-generatedmethodfor(inti=1;i<=6;i System.out.print("for(int System.out.print("*System.out.println packagepublicclassLX230publicstaticvoidmain(String[]args)//TODOAuto-generatedmethodfor(inti=1;i<=6;i 67System.out.print("89System.out.printSystem.out.println}} packagepublicclassTestArraypublicstaticvoidmain(String[]args)//TODOAuto-generatedmethodint[]a=new for(int 1 for(int 2-32Fibonacci10packagepublicclassFibonaccipublicstaticvoidmain(String[]args)//TODOAuto-generatedmethodintintf[]=new 2-32108获得到平均分。packagepublicclassArrayOKpublicstaticvoidmain(String[]args) []//intsum= int intmin= 8for(inti=0;i<9sum+=for(inti=1;iif(max<max=for(inti=1;i<if(min>min=doubleavg=(sum-max-} packagepublicclassFibonaccipublicstaticvoidmain(String[]args)//TODOAuto-generatedmethodintintf[]=new packagepublicclassArraySortpublicstaticvoidmain(String[]args)//TODOAuto-generatedmethodint[]score=intscore[]=newfor(int for(intint for(int 【例2-35】实现10行三角元素的以及输出publicclassYHTrianglepublicstaticvoidmain(String3intarrnew 4for(introw0;row 5for(intcol=0;col<=6if(col 7arr[row][col]=8}9}}}for(introw0;row for(intcol=0;col<=}}} importimportpublicclassGuessNumberpu