推 zeat:嗯, 變數的給值跟block的執行的確是在constructor之前. 05/04 11:10
推 macbuntu:但是第一行是 this(...) 的 constructor 就不會加喔, 05/04 11:58
推 macbuntu:不然會重複 initialize 05/04 12:00
→ sbrhsieh:感謝 macbuntu 的補充說明 05/04 14:19
推 ozone:剛試了一下 initializer似乎是跑在constructor前面的?! 05/04 02:18
instance initializer 與 field initializer 都是由編譯器 insert/inline 到每一
個 constructor 裡最前面(after super constructor invocation)。
class Bar {
public Bar(int n){}
}
class Foo extends Bar {
String name = "A";
{
name = "B";
}
public Foo() {
super(0);
name = "";
}
public Foo(String s) {
super(0);
name = s;
}
}
編譯出來的 class bytecode 會等同於(以 sun's Java Compiler 來說):
class Foo extends Bar {
String name;
public Foo() {
super(0);
name = "A";
name = "B";
name = "";
}
public Foo(String s) {
super(0);
name = "A";
name = "B";
name = s;
}
}
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