An introduction to the method of correctly naming JavaBeans

This article mainly introduces the relevant information on the JavaBean property naming specification issues based on java. Friends in need can refer to

javaBean attribute naming specification issues based on java

JavaBean attribute name requirements: the first two letters are either uppercase or lowercase

Let’s find out what it will look like if we don’t follow this specification? ?

Because I have not used reflection to find the corresponding attribute value through non-standard attribute names, the following conclusions are all my guesses. If there are any mistakes, you are welcome to correct them! ! !

package com.domain;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;

class Test{
  private String AA;
  private String Bb;
  private String cC;
  private String dd;
  public String getAA() {//如果通过AA属性名查找属性值，能成功
    return AA;
  }
  public void setAA(String aA) {
    AA = aA;
  }
  public String getBb() {//如果通过Bb来查找属性值，不能成功，必须通过bb来查找
    return Bb;
  }
  public void setBb(String bb) {
    Bb = bb;
  }
  public String getcC() {//如果通过cC来查找属性值，能成功
    return cC;
  }
  public void setcC(String cC) {
    this.cC = cC;
  }
  public String getDd() {//如果通过dd来查找属性值，能成功
    return dd;
  }
  public void setDd(String dd) {
    this.dd = dd;
  }

}
public class JavaBean_02 {
  public static void main(String[] args)throws Exception {
    BeanInfo beanInfo = Introspector.getBeanInfo(Test.class);
    PropertyDescriptor[] pds = beanInfo.getPropertyDescriptors();
    for(int i=0;i<pds.length;i++){
      System.out.println(pds[i].getName());
    }
  }

}
/*输出:
AA
bb
cC
dd
*/

Obviously, the get method written according to the specifications is very beautiful.

Usually the attribute name must be distinguished from the package name, class name, method name, field name, constant name:

First of all: Must be in English, not Chinese Pinyin

1: Package: used to classify classes that complete different functions and place them in different directories (packages). The naming of the packages Rule: Reverse the company domain name as the package name. For example, www.sohu.com For package names: each letter needs to be lowercase. For example: com.sohu.test; the full name of the Test class under this package is: com.sohu.Test.Java.

If you do not use package when defining a class, then Java will think that the class we defined is in the default package (default package).

2: Class: The first letter is capitalized. If a class consists of multiple words, the first letter of each word is capitalized, and no connectors are used in the middle. Use English as much as possible. For example, ConnectionFactory

3: Method: The first word is all lowercase. If a method consists of multiple words, then the first letter is capitalized starting from the second word, and no connector is used. addPerson

4: Field: Same as method. Such as ageOfPerson

5: Constant: The letters of all words are capitalized. If there are multiple words, just use underline links.

For example: public static final int AGE_OF_PERSON = 20; //Usually add static

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