publicclassSample{publicstaticvoidmain(String[]args){Stringstr="Helloworld";System.out.println("Stringis:"+str);Stringstr2=newString("Welcometojava"...

 str="www.runoob.com"print(str.upper())#把所有字符中的小写字母转换成大写字母print(str.lower())#把所有字符中的大写字母转换成小写字母print(str.capitalize())#把第一个字母转化为大写字母，其余小写print(str.title())...

 图片  链接:https://pan.baidu.com/s/1jeFYO4e4_IYksQEXPD65pw 密码:mibt https://www.jb51.net/article/167577.htm...

 strA="longstring"strB="string"result=$(echo$strA|grep"${strB}")if[["$result"!=""]]thenecho"包含"elseecho"不包含"fistrA="helloworld"strB="low"if[[$strA=~$strB]]...

 awk方式bogon:confmacname$echo"abcde"|awk'{printlength($0)}'5 利用${#str}来获取字符串的长度bogon:confmacname$a="abcdef"bogon:confmacname$echo${#a}6 wc方式（注意是包含...

 #!/bin/bashstring="hello,shell,split,test"#将,替换为空格array=(${string//,/})forvarin${array[@]}doecho$vardone输出bogon:confmacname$./test.shhelloshellsplittest&n...

 test.sh#!/bin/bashyour_name="runoob"#使用双引号拼接greeting="hello,"$your_name"!"greeting_1="hello,${your_name}!"echo$greeting$greeting_1#使用单引号拼接greeting_2='hell...

 #!/bin/basha="Thecatsatonthemat"test="cat"awk-va="$a"-vb="$test"'BEGIN{printindex(a,b)}'输出bogon:Desktopmacname$./test.sh5  参考： ...

 [admin@localhostfile]$catfilehello0hello1hello2hello3hello4[admin@localhostfile]$cattest.sh#!/bin/bashwhilereadlinedoecho'buy'$linedone<file>>fil...

 分析这道题，输入数据有如下几种情况：这一类包含以下几种情况：输入字符串为空开头字符为数字、符号（+，-）、空格以外的字符有多个加减符号的字符串符号没有紧跟数字字符串中没有数字以上这几种情况直接返回0这类情况中，数字后如出现其他不是数字的字符，那么该符号出现位置后的所有字符无效这类该怎么转就怎么转参考代码如下...

 #coding=utf-8defreverseVowels(s):""":types:str:rtype:str"""sStr=list(s)voList={'a':0,'A':0,'e':0,"E":0,'i':0,"I":0,'o':0,'O':0,'u':0,'U':0}front=0length=l...

 mysql>select*fromtest;+----+------------+-------+-----------+|id|name|score|subject|+----+------------+-------+-----------+|1|xiaoming|89|shuxue||2|xia...

 mysql>select*fromtest;+----+------------+-------+-----------+|id|name|score|subject|+----+------------+-------+-----------+|1|xiaoming|89|shuxue||2|xia...

 mysql>select"ddddddee";+--------------+|ddddddee|+--------------+|ddddddee|+--------------+1rowinset(0.00sec)mysql>selectrtrim("ddddddee");+--------...

 insertintoshare(uid,mapId,isdir,type,pwd,shareTime,overTime,price)values(1,10,0,1,"111111",STR_TO_DATE('2019-08-0304:52:13','%Y-%m-%d%H:%i:%s'),STR_TO_DAT...