这篇文章主要介绍了简单了解Java类成员初始化顺序,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
类中包含7中成员：
1、静态变量 static
2、final静态常量 final static
3、静态代码块 static{} //多个代码块顺序执行
4、普通变量
5、普通代码块 {} //多个代码块顺序执行
6、构造方法
7、普通方法
类中成员初始化方式（排出7）：
非继承类中：
继承类中:
代码：
* 每个属性设置断点，启动后可以观察执行顺序。
父类：
package com.lookcoder.haircutmember.vo;
public class TRoleVoAFather {
private String nameFather = "12";
private Integer ageFather = 1;
private int ageiFather = 1;
{
System.out.println("father defualt method block2");
}
private String defualtInitFather = getDefaultInit();
{
System.out.println("father defualt method block1");
}
private String getDefaultInit() {
return "father default init";
}
// ----------------------------------------------------------------------------
private static String aFather = "2";
private final static String aaFather = getFinalStatic();
static {
System.out.println("father default static method2");
}
private static Integer bFather = 1;
static {
System.out.println("father default static method1");
}
private final static Integer bbFather = 2;
private static String getFinalStatic() {
return "father final static aa";
}
private final static Boolean bo = true;
// ----------------------------------------------------------------------------
TRoleVoAFather() {
System.out.println("father default construct");
}
TRoleVoAFather(String name, Integer age) {
this.nameFather = name;
this.ageFather = age;
}
// ----------------------------------------------------------------------------
public void abc() {
System.out.println("abc method!");
}
}
子类：
package com.lookcoder.haircutmember.vo;
public class TRoleVoA extends TRoleVoAFather{
private int agei = 1;
{
System.out.println("defualt method block2");
}
private Integer age = 1;
{
System.out.println("defualt method block1");
}
private String name = "12";
private String defualtInit = getDefaultInit();
private String getDefaultInit() {
return "default init";
}
// ----------------------------------------------------------------------------
private final static Integer bb = 2;
private final static String aa = getFinalStatic();
private static String getFinalStatic() {
return "final static aa";
}
private final static Boolean bo = true;
private static String a = "2";
private static Integer b = 1;
static {
System.out.println("default static method2");
}
static {
System.out.println("default static method1");
}
private static Integer b11= 1;
// ----------------------------------------------------------------------------
TRoleVoA() {
System.out.println("default construct");
}
TRoleVoA(String name, Integer age) {
super(name, age);
this.name = name;
this.age = age;
}
// ----------------------------------------------------------------------------
public void showDefault() {
System.out.println("show default method!");
}
}
启动类：
package com.lookcoder.haircutmember.vo;
public class TRoleVoARun {
public static void main(String[] args) {
TRoleVoA tRoleVo = new TRoleVoA("123", 123);
tRoleVo.showDefault();
}
}
