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android java split ArrayIndexOutOfBoundsException

用竖 * 分隔字符串运行将抛出java.util.regex.PatternSyntaxException异常,用加号 + 也是如此。
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    String[] aa = "aaa*bbb*ccc".split("*");

    //String[] aa = "aaa|bbb|ccc".split("\\*"); 这样才能得到正确的结果    

    for (int i = 0 ; i <aa.length ; i++ ) {

      System.out.println("--"+aa[i]); 

    }
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go url encoding

func  QueryUnescape func QueryUnescape (s string ) ( string , error ) QueryUnescape does the inverse transformation of QueryEscape, converting %AB into the byte 0xAB and '+' into ' ' (space). It returns an error if any % is not followed by two hexadecimal digits. func  QueryUnescape func QueryUnescape (s string ) ( string , error ) QueryUnescape does the inverse transformation of QueryEscape, converting %AB into the byte 0xAB and '+' into ' ' (space). It returns an error if any % is not followed by two hexadecimal digits.
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go golang get disk usage free space remain info

package main import ( "fmt" "syscall" ) func main() { fmt.Println(DiskUsage("./")) } func DiskUsage(path string) uint64 { fs := syscall.Statfs_t{} err := syscall.Statfs(path, &fs) if err != nil { return 0 } return fs.Bfree * uint64(fs.Bsize) } //All space   = fs.Blocks * uint64(fs.Bsize) //Free space = fs.Bfree * uint64(fs.Bsize) //Used space= fs.All - disk.Free
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