map

public static void main(String[] args) {
Map<String,String> paramsMap = new HashMap<String, String>();
paramsMap.put("channelCode", "1111111111");
paramsMap.put("sign_type", "RSA");

String channelCode = (String) paramsMap.remove("channelCode");
String sign_type = (String) paramsMap.remove("sign_type");
System.out.println("channelCode=" + channelCode);
System.out.println("sign_type=" +  sign_type);

paramsMap.remove("channelCode");
paramsMap.remove("sign_type");

System.out.println("channelCode2=" + paramsMap.get("channelCode"));
System.out.println("sign_type2=" + paramsMap.get("sign_type"));

}