一个标准化实例

package com.StandardForm;
/**
 * 
 * @author phil616
 * This class are written as a document to standard code style.
 */
class StandardClass {
    /*
     * This class are constructed by a rather standard form.
     * Here are some precondition:
     * 1. I want property 'data' can only initialize when the object constructed.
     * 2. I want property 'PI' is a constant value and cannot be changed at all condition.
     * */
    //There are three properties defined by private and one by public.
    private int data;
    private String str;
    private double number;
    public final static double PI = 3.14;
    //This constructor is expected to initialize all properties.
    StandardClass(){
        this.data = 0;
        this.number = 0.0;
        this.str = null;
    }
    //This constructor is expected to initialize properties by users.
    public StandardClass(int data, String str, double number){
        this();                //null parameter constructor can be called before set-methods
        setData(data);        //set data
        setStr(str);        //set string
        setNumber(number);    //set number
    }
    /*
     * If I want to set 'data' only at the beginning, I should set this method to private,
     * in this case, once this method called at constructor and set a data, one cannot 
     * set data anymore because its set method is private.
     * */
    private void setData(int data){
        this.data = data;
    }
    //set other properties.
    public void setStr(String str){
        this.str = str;
    }
    public void setNumber(double number){
        this.number = number;
    }
    /*
     * Attention, when we name a method/properties/parameter/local variables,
     * lowerCamelCase is recommended, which means that the first letter is lower-case
     * and the first letter of next word and other words are upper-case, looks like these:
     * getData / setUserName / makeUserInfoByFunction
     * and UpperCamelCase is looks like this:
     * PublicClass TcpUdpDeal
     * */
    public int getData(){
        return this.data;
    }
    public String getStr(){
        return this.str;
    }
    public double getNumber(){
        return this.number;
    }
}

几个前提条件：
属性 data 是一个只能在构造时修改的量
属性 PI 是一个不能被修改的共享常量
四个属性中，三个属于私有属性不可被外部修改，PI是一个公开但是不能被修改的常量
且该常量被放置在静态区
无参构造函数将所有属性初始化或将指针置空
有参构造将会把传进来的参数通过get方法初始化各个属性
先调用无参构造

如果我们想把data设置成只能修改一次的值，那么需要把他的权限设置成私有
这样的话可以设计成除了构造函数在类内调用一次，没有其他办法访问该set方法

注意，当我们命名一个方法，属性，参数或是局部变量时，建议使用小写的驼峰命名法
而类名等使用大写驼峰命名法
获取单个属性使用get+属性名的方式获取
set同理，这里的get推荐使用带返回值的类型，由于设计的应用类在设计完成后几乎不会更改，
因此在设计get函数时应返回值而非打印值，保持功能单一极简以保证代码的健壮性。