public
class
Sample
{
public
static
void
main(String[] args){
B ba
=
new
B();
System.out.println(
"
-------------------------------
"
);
B bb
=
new
B();
}
};
class
Target
{
public
Target(String s){
System.out.println(
"
Target(
"
+
s
+
"
)
"
);
}
};
class
A
{
public
static
Target td
=
new
Target(
"
static in A
"
);
static
{
System.out.println(
"
static block in A
"
);
}
{
System.out.println(
"
non-static block in A
"
);
}
public
Target ta
=
new
Target(
"
in A
"
);
};
class
B
extends
A
{
public
Target tb
=
new
Target(
"
in B
"
);
static
{
System.out.println(
"
static block in B
"
);
}
static
public
Target tc
=
new
Target(
"
static in B
"
);
{
System.out.println(
"
non-static block in B
"
);
}
};
结果：
Target( static in A)
static block in A
static block in B
Target( static in B)
non - static block in A
Target( in A)
Target( in B)
non - static block in B
-------------------------------
non - static block in A
Target( in A)
Target( in B)
non - static block in B
注意：
- All data fields are initialized to their default value (0, false, or null).
- All field initializers and initialization blocks are executed, in the order in which they occur in the class declaration.
- If the first line of the constructor calls a second constructor, then the body of the second constructor is executed.
- The body of the constructor is executed。
另外，可以看到：
先父类的static，后子类的static，然后父类的非static，再子类的非static。
static包括静态的字段和初始化块。
非static包括非静态字段和初始化块。
同级别的字段或初始化块的顺序就依赖于定义的先后了。
还有一点简单的，顺便提一下：
static的东东只在类装入的时候，执行一次。不是每次实例化一个对象时都执行。
顺便提第二点：在jdk5中因为支持可变参数列表所以，
public
static void main(String... args) ... {}
是成立的。
另外，关于初始化问题参见：
http://www.javaworld.com/javaworld/jw-03-1998/jw-03-initialization.html?page=1