String限定类型的HashMap以及一个String工具类

1.StringHashMap

// import
import test.alibabaSourceCode.StringUtils;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.TimeZone;


public class StringHashMap extends HashMap<String, String> {


    private static final long serialVersionUID = -1277791390393392630L;

    public StringHashMap() {
    }

    public StringHashMap(Map<? extends String, ? exten