java2经典问题

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1、1.百鸡问题;/***@(#)baiji.java***@author*@version1.002010/3/17*/publicclassbaiji{/***Createsanewinstanceofbaiji.*/publicbaiji(){}/***@paramargsthecommandlinearguments*/publicstaticvoidmain(String[]args){//TODOcodeapplicationlogichereSystem.out.println("百鸡问题"

2、);intx;inty;intz;for(x=1;x<=100;x++){for(y=1;y<=100;y++){for(z=1;z<=100;z++){if((x+y+z==100)&(5*x+3*y+z/3.0==100)){System.out.print("thenumberofcocksis"+x+";");System.out.print("thenumberofhensis"+y+";");System.out.print("thenumberofchicksis"+z+".");System.out.print

3、ln();}}}}}}2.求自然对数e;/**@(#)E.java1.010/03/17**Youcanmodifythetemplateofthisfileinthe*directory..JCreatorTemplatesTemplate_1Project_Name.java**Youcanalsocreateyourownprojecttemplatebymakinganew*folderinthedirectory..JCreatorTemplate.Usetheother*templatesasexam

4、ples.**/packagemyprojects.e;importjava.awt.*;importjava.awt.event.*;classEextendsFrame{publicE(){addWindowListener(newWindowAdapter(){publicvoidwindowClosing(WindowEvente){dispose();System.exit(0);}});}publicstaticvoidmain(Stringargs[]){doublee=1.0;doublet=1.0;for(i

5、nti=1;i<=20;i++){t/=i;e+=t;}System.out.println("e="+e);/**第二种方法：e=0.0;for(inti=20;i>0;i--){e=(e+1.0)/i;}e++;System.out.println(e);**/}}3.求圆周率pi;/***@(#)pi.java***@author*@version1.002010/3/18*/publicclasspi{/***Createsanewinstanceofpi.*/publicpi(){}/***

6、@paramargsthecommandlinearguments*/publicstaticvoidmain(String[]args){//TODOcodeapplicationlogicheredoublei;doubles;doublePi;intsign=1;i=1;s=0;Pi=0;while(i<=1000000){s=1/i;i=i+2;s=s*sign;sign=(-1)*sign;Pi=Pi+s;}Pi=Pi*4;System.out.println("Pi="+Pi);}}4.输入字符串；/***@(#)

7、app3_3.java***@author*@version1.002010/3/18*///app3_3.javaimportjava.io.*;publicclassapp3_3{/***Createsanewinstanceofapp3_3.*/publicapp3_3(){}/***@paramargsthecommandlinearguments*/publicstaticvoidmain(String[]args)throwsIOException{//TODOcodeapplicatio

8、nlogichereBufferedReaderbuf;Stringstr;buf=newBufferedReader(newInputStreamReader(System.in));System.out.print("请输入字符串：");str=buf.readLine(