SimpleDateFormat - 实现字符串与日期之间的转换

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.junit.Test;

public class TestSimpleDateFormat {

    @Test
    public void format() {
        Date date = new Date();
        System.out.println("Date:"+date);
        //Date:Tue Oct 11 11:07:55 CST 2016
        SimpleDateFormat sdf  = new SimpleDateFormat("yyyy-mm-dd");
        String date_formatString = sdf.format(date);
        System.out.println(date_formatString);
        //  2016-07-11
    }

    @Test
    public void parse(){
        String str = "2016-03-11";
        SimpleDateFormat sdf  = new SimpleDateFormat("yyyy-mm-dd");
        try {
            Date date = sdf.parse(str);
            System.out.println("Parse String To Date : "+date);
            //Parse String To Date : Mon Jan 11 00:03:00 CST 2016

            java.sql.Date date2 = java.sql.Date.valueOf(str);
            System.out.println("Parse String To Date : "+date2);
            //Parse String To Date : 2016-03-11
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}