日期格式转换的Java实现

import java.io.*;
import java.text.DateFormat; 
import java.text.ParseException; 
import java.text.SimpleDateFormat; 

class SimpleInput{
public static String readString() {
BufferedReader br = new BufferedReader(
new InputStreamReader(System.in), 1);
String string = "";

try {
string = br.readLine();
} catch (IOException ex) {
System.out.println(ex);
}
return string;
}
}

public class TestDate {
public static void main(String[] args){
System.out.print("ÇëÊäÈëÈÕÆÚ£¨yyyy-MM-dd£©:");
String s=SimpleInput.readString(); 
DateFormat date1=new SimpleDateFormat("yyyy-MM-dd"); 
DateFormat date2=new SimpleDateFormat("MMMM dd,yyyy",java.util.Locale.US);
try { 
s = date2.format(date1.parse(s)); 
System.out.println(s); 
} catch (ParseException e) {