引⾔言

史蒂夫.乔布斯说，”复杂的终极境界是简单“，同样的优雅的代码⼀一定是精简明了了，可读性好

优化

LocalDate和LocalDateTime 优化前

      SimpleDateFormat sdfDay = new SimpleDateFormat("yyyy-MM-dd");

SimpleDateFormat sdfMins = new SimpleDateFormat("yyyy-MM-dd

HH:mm:ss");

Date now = new Date();

String today = sdfDay.format(now);

String waterStart = today + " 01:00:00";

String waterEnd = today + " 02:00:00";

Date waterStartTime = sdfMins.parse(waterStart);

Date waterEndTime = sdfMins.parse(waterEnd);

优化后

Lombok

优化前

   LocalDateTime now = LocalDateTime.now();

LocalDateTime waterStart = LocalDateTime.of(now.getYear(),

now.getMonth(),now.getDayOfMonth(),1,0);

LocalDateTime waterEndTime =LocalDateTime.of(now.getYear(),

now.getMonth(),now.getDayOfMonth(),2,0);

    public class test {

    private String abc;

    private String bcd;

    public String getAbc() {

return abc; }

    public void setAbc(String abc) {

        this.abc = abc;

    }

    public String getBcd() {

return bcd;

   } }

}

public void setBcd(String bcd) {

    this.bcd = bcd;

}

@Override

public String toString() {

    return "test{" +

"abc='" + abc + ''' +

", bcd='" + bcd + ''' +

'}';

优化后

   <dependency>

    <groupId>org.projectlombok</groupId>

    <artifactId>lombok</artifactId>

</dependency>

  @Data

public class test {

    private String abc;

    private String bcd;

}

Optional

优化前

优化后

字符串串累加 优化前

    if (StringUtils.isEmpty(phone)) {

  param.put("status", "119");

} else {

  param.put("status", phone);

}

   Optional.ofNullable(phone).orElse("119"); //或者

StringUtils.defaultIfEmpty(phone, "119")

  

   StringBuffer sb = new StringBuffer();

sb.append("asd");

sb.append(request.getSellerTaobaoId());

sb.append("|123");

字符串串只要不不在for循环⾥里里累加，可以直接⽤用+号，因为编译成字节码后会变成 StringBuilder，如果在for循环⾥里里⾯面⽤用+号会⽣生成多个StringBuilder，所以在for循环⾥里里累加最 好在循环外创建StringBuilder

优化后

String sblog="asd"+request.getSellerTaobaoId()+"|123; List To Map

优化前

       Map<String, String> AssetsMetaIdMap = Maps.newHashMap();

        for (AssetsInfoBO assetsInfoBO :

request.getAssetsCollectionList()) {

           AssetsMetaIdMap.put(assetsInfoBO.getAssetMetadataId(),

assetsInfoBO.getAssetMetadataId());

        }

优化后

减少不不必要的判断 优化前

优化后

      return request.getExtDataValue(REQUEST_ID_KEY);

去掉else 优化前

   Map<String, String> AssetsMetaIdMap =

request.getAssetsCollectionList().stream().collect(Collectors.toMap(Ho

sting::getAssetMetadataId, Hosting::getAssetMetadataId));

    String requestId = null;

if (null != request.getExtData()) {

    requestId = request.getExtDataValue(REQUEST_ID_KEY);

}

return requestId;

     

   if (null != result &

  return no;

} else {

  throw new RuntimeException("XX");

}

优化后

不不返回Boolean 优化前

优化后

invoke = "true".equalsIgnoreCase(value.toString()); 最⼩小化判断

优化前

优化后

省略略⽆无意义的赋值 优化前

   if (null != result &

     return no;

}

throw new RuntimeException("XX");

    if ("true".equalsIgnoreCase(value.toString())) {

  invoke = true;

} else {

  invoke = false;

}

       if (0 == code) {

  sendMessage("A001", "success", out)

} else {

  sendMessage("A001", "fial", out)

}

   String message = (0 == code ? "success" : "fail");

sendMessage("A001", message, out);

  

   public List<User> query(Map<String, Object> params){

  List<User> userList = null;

  try {

    userList = mapper.queryList(params);

  } catch (Exception e) {

    throw new RuntimeException(e.getMessages())

  }

  return userList;

}

优化后

   public List<User> query(Map<String, Object> params){

  try {

    return mapper.queryList(params);

  } catch (Exception e) {

    throw new RuntimeException(e.getMessages())

  }

}

引⾔言

史蒂夫.乔布斯说，”复杂的终极境界是简单“，同样的优雅的代码⼀一定是精简明了了，可读性好

优化

LocalDate和LocalDateTime 优化前

      SimpleDateFormat sdfDay = new SimpleDateFormat("yyyy-MM-dd");

SimpleDateFormat sdfMins = new SimpleDateFormat("yyyy-MM-dd

HH:mm:ss");

Date now = new Date();

String today = sdfDay.format(now);

String waterStart = today + " 01:00:00";

String waterEnd = today + " 02:00:00";

Date waterStartTime = sdfMins.parse(waterStart);

Date waterEndTime = sdfMins.parse(waterEnd);

优化后

Lombok

优化前

   LocalDateTime now = LocalDateTime.now();

LocalDateTime waterStart = LocalDateTime.of(now.getYear(),

now.getMonth(),now.getDayOfMonth(),1,0);

LocalDateTime waterEndTime =LocalDateTime.of(now.getYear(),

now.getMonth(),now.getDayOfMonth(),2,0);

    public class test {

    private String abc;

    private String bcd;

    public String getAbc() {

return abc; }

    public void setAbc(String abc) {

        this.abc = abc;

    }

    public String getBcd() {

return bcd;

   } }

}

public void setBcd(String bcd) {

    this.bcd = bcd;

}

@Override

public String toString() {

    return "test{" +

"abc='" + abc + ''' +

", bcd='" + bcd + ''' +

'}';

优化后

   <dependency>

    <groupId>org.projectlombok</groupId>

    <artifactId>lombok</artifactId>

</dependency>

  @Data

public class test {

    private String abc;

    private String bcd;

}

Optional

优化前

优化后

字符串串累加 优化前

    if (StringUtils.isEmpty(phone)) {

  param.put("status", "119");

} else {

  param.put("status", phone);

}

   Optional.ofNullable(phone).orElse("119"); //或者

StringUtils.defaultIfEmpty(phone, "119")

  

   StringBuffer sb = new StringBuffer();

sb.append("asd");

sb.append(request.getSellerTaobaoId());

sb.append("|123");

字符串串只要不不在for循环⾥里里累加，可以直接⽤用+号，因为编译成字节码后会变成 StringBuilder，如果在for循环⾥里里⾯面⽤用+号会⽣生成多个StringBuilder，所以在for循环⾥里里累加最 好在循环外创建StringBuilder

优化后

String sblog="asd"+request.getSellerTaobaoId()+"|123; List To Map

优化前

       Map<String, String> AssetsMetaIdMap = Maps.newHashMap();

        for (AssetsInfoBO assetsInfoBO :

request.getAssetsCollectionList()) {

           AssetsMetaIdMap.put(assetsInfoBO.getAssetMetadataId(),

assetsInfoBO.getAssetMetadataId());

        }

优化后

减少不不必要的判断 优化前

优化后

      return request.getExtDataValue(REQUEST_ID_KEY);

去掉else 优化前

   Map<String, String> AssetsMetaIdMap =

request.getAssetsCollectionList().stream().collect(Collectors.toMap(Ho

sting::getAssetMetadataId, Hosting::getAssetMetadataId));

    String requestId = null;

if (null != request.getExtData()) {

    requestId = request.getExtDataValue(REQUEST_ID_KEY);

}

return requestId;

     

   if (null != result &

  return no;

} else {

  throw new RuntimeException("XX");

}

优化后

不不返回Boolean 优化前

优化后

invoke = "true".equalsIgnoreCase(value.toString()); 最⼩小化判断

优化前

优化后

省略略⽆无意义的赋值 优化前

   if (null != result &

     return no;

}

throw new RuntimeException("XX");

    if ("true".equalsIgnoreCase(value.toString())) {

  invoke = true;

} else {

  invoke = false;

}

       if (0 == code) {

  sendMessage("A001", "success", out)

} else {

  sendMessage("A001", "fial", out)

}

   String message = (0 == code ? "success" : "fail");

sendMessage("A001", message, out);

  

   public List<User> query(Map<String, Object> params){

  List<User> userList = null;

  try {

    userList = mapper.queryList(params);

  } catch (Exception e) {

    throw new RuntimeException(e.getMessages())

  }

  return userList;

}

优化后

   public List<User> query(Map<String, Object> params){

  try {

    return mapper.queryList(params);

  } catch (Exception e) {

    throw new RuntimeException(e.getMessages())

  }

}