Java 初始化顺序

2015-01-17 18:25 66人阅读 评论(0) 收藏 举报

代码示例：

1.父类
public class Parent {
Parent(){
//父类构造函数
System.out.println("Parent constructor");
}
private static String   parentStaticField = initParentStaticField();//父类静态成员
static{
//父类静态块
System.out.println("Parent static block");
}
{
//父类非静态块
System.out.println("Parent non-static block");
}
private String   parentNonStaticField = initparentNonStaticField();//父类实例成员
private String initparentNonStaticField(){
System.out.println("Parent Non-StaticField init");
return "parentNonStaticField";
}
private static String initParentStaticField(){
System.out.println("Parent staticField init");
return "parentNonStaticField";
}
}

2.子类
public class Children extends Parent {

Children(){
//子类构造函数
System.out.println("Children constructor");
}
static{
//子类静态块
System.out.println("Children static block");
}
private String   childrenNonStaticField = initChildrenNonStaticField();

private String initChildrenNonStaticField(){
System.out.println("Children Non-StaticField init");
return "childrenNonStaticField";
}
{
//子类非静态块
System.out.println("Children non-static block");
}
private static String   childrenStaticField = initChildrenStaticField();//子类静态成员

private static String initChildrenStaticField(){
System.out.println("Children staticField init");
return "childrenNonStaticField";
}
}

3.测试类

class Test{
public static void main(String[] args){
new Children();
}
}

4.输出：

Parent staticField init
Parent static block
Children static block
Children staticField init
Parent non-static block
Parent Non-StaticField init
Parent constructor
Children Non-StaticField init
Children non-static block
Children constructor