java面试编程题

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1、1．写一个函数，例如：给你的 a b c 则输出 abc  acb  bac  bca  cab  cba packagetest;importjava.util.ArrayList;importjava.util.List;publicclassListOpreation{publicstaticvoidmain(String[]args){Strings="ABCD";Listlist=list(s,"");System.out.println(list.size());System.out.println(list);}publicstaticList

2、>list(Stringbase,Stringbuff){Listresult=newArrayList();if(base.length()<=0){result.add(buff);System.out.println(result.toString()+"&");}for(inti=0;itemp=list(newStringBuilder(base).deleteCharAt(i).toString(),buff+base.charAt(i));result.addAll(temp);

3、}for(inti=0;i

4、tr="aadsfdfgdfcvsdfsdf";strOperation(str);}privatestaticvoidstrOperation(Stringstr){//TODOAuto-generatedmethodstubSystem.out.println("str:"+str);StringnewStr="";for(inti=0;i

5、 把两个变量的值互换packagetest;publicclassListOperation1{publicstaticvoidmain(String[]args){inta=20;intb=30;a=a*b;b=a/b;a=a/b;System.out.println("a="+a+''+"b="+b);}}2．冒泡排序packagetest;publicclassListOperation2{publicstaticvoidmain(String[]args){int[]list={20,27,15,29,4,14,28};sort(list);for(inti=0;i

6、.length;i++){System.out.print(list[i]+"");}System.out.println();}publicstaticint[]sort(int[]list){inttemp;for(inti=0;i

7、le;importjava.io.FileInputStream;importjava.io.FileNotFoundException;importjava.io.FileOutputStream;importjava.io.IOException;publicclassListOperation3{publicstaticvoidmain(String[]args){FileoldFile=newFile("D:\1.txt"