init test commit

main.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"jvm.com/parseCmd"
+	"fmt"
+)
+
+func main() {
+	cmd := parseCmd.ParseCmd()
+	fmt.Println(cmd.VersionFlag)
+	if cmd.VersionFlag {
+		fmt.Println("version 0.0.1")
+	} else if cmd.HelpFlag || cmd.Class == "" {
+		parseCmd.PrintUsage()
+	} else {
+		startJVM(cmd)
+	}
+}
+
+func startJVM(cmd *parseCmd.Cmd){
+	fmt.Printf("classpath: %s class:%s args:%v \n",cmd.CpOption, cmd.Class, cmd.Args)
+}

parseCmd/parseCmd.go

@@ -0,0 +1,39 @@
+package parseCmd
+
+import (
+	"flag"
+	"fmt"
+	"os"
+)
+
+type Cmd struct {
+	HelpFlag    bool
+	VersionFlag bool
+	CpOption    string
+	Class       string
+	Args        []string
+}
+
+func ParseCmd() *Cmd {
+	cmd := &Cmd{}
+
+	flag.Usage = PrintUsage
+	flag.BoolVar(&cmd.HelpFlag, "help", false, "print help message")
+	flag.BoolVar(&cmd.HelpFlag, "?", false, "print help message")
+	flag.BoolVar(&cmd.HelpFlag, "version", false, "print version and exit")
+	flag.StringVar(&cmd.CpOption, "classpath", "", "classpath")
+	flag.StringVar(&cmd.CpOption, "cp", "", "classpath")
+	flag.Parse()
+
+	args := flag.Args()
+
+	if len(args) > 0 {
+		cmd.Class = args[0]
+		cmd.Args = args[1:]
+	}
+	return cmd
+}
+
+func PrintUsage() {
+	fmt.Printf("Usage: %s [-options] class [args...]\n", os.Args[0])
+}