1、解压压缩包到go工作目录,如解压到E:\opensource\go\go,解压后的目录结构如下:
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E:\opensource\go\go
├─api
├─bin
│ ├─go.exe
│ ├─godoc.exe
│ └─gofmt.exe
├─doc
├─include
├─lib
├─misc
├─pkg
├─src
└─test
2、增加环境变量GOROOT,取值为上面的go工作目录
3、Path环境变量中添加";%GOROOT%\bin",以便能够直接调用go命令来编译go代码,至此go编译环境就配置好了
注:如果不想手动设置系统环境变量,也可下载go启动环境批处理附件,
修改goenv.bat文件中的GOROOT值为上面的go工作目录后直接双击该bat文件,go编译环境变量即设置完成。
4、测试go编译环境,启动一个cmd窗口,直接输入go,看到下面的提示就是搭建成功了
E:\opensource\go\gogo
Go is a tool for managing Go source code.
Usage:
go command [arguments]
The commands are:
build compile packages and dependencies
clean remove object files
doc run godoc on package sources
env print Go environment information
fix run go tool fix on packages
fmt run gofmt on package sources
get download and install packages and dependencies
install compile and install packages and dependencies
list list packages
run compile and run Go program
test test packages
tool run specified go tool
version print Go version
vet run go tool vet on packages
Use "go help [command]" for more information about a command.
Additional help topics:
gopath GOPATH environment variable
packages description of package lists
remote remote import path syntax
testflag description of testing flags
testfunc description of testing functions
Use "go help [topic]" for more information about that topic.
5、编译helloworld测试程序,go语言包中test目录带有helloworld.go测试程序,源码见"附一 helloworld.go",
直接调用"go build helloworld.go"就生成了"helloworld.exe"可执行程序,运行一下这个程序看到了我们期望的hello,wolrd。
E:\opensource\go\go\testgo build helloworld.go
E:\opensource\go\go\testhelloworld.exe
hello, world
E:\opensource\go\go\test
附一 helloworld.go
// cmpout
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Test that we can do page 1 of the C book.
package main
func main() {
print("hello, world\n")
}
你在编译器里面build一下,然后去\bin\debug目录下找.exeexe就是可执行文件了。运行的时候可能需要用到debug目录下的其他文件(如配置文件、dll等),所以需要把debug下的所有文件都放到一起。
1.最简单的方法:
public static String reverse1(String str)
{ return new StringBuffer(str).reverse().toString();
}
2.最常用的方法:
public static String reverse3(String s)
{ char[] array = s.toCharArray();
String reverse = ""; //注意这是空串,不是null
for (int i = array.length - 1; i = 0; i--)
reverse += array[i];
return reverse;
}
3.常用方法的变形:
public static String reverse2(String s)
{ int length = s.length();
String reverse = ""; //注意这是空串,不是null
for (int i = 0; i length; i++)
reverse = s.charAt(i) + reverse;//在字符串前面连接, 而非常见的后面
return reverse;
}