java 格式化时间

import java.text.SimpleDateFormat;
import java.util.*;

public class Test {

    public static void main(String[] args) {

        Date date = new Date();
        String str = "yyy-MM-dd HH:mm:ss";
        SimpleDateFormat sdf = new SimpleDateFormat(str);
        System.out.println(sdf.format(date));
    }

}