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())
}
}
