java-構造函數和靜態初始化

//: StaticInitialization.java
// Specifying initial values in a
// class definition.


class Bowl {
Bowl(int marker) {
System.out.println("Bowl(" + marker + ")");
}


void f(int marker) {
System.out.println("f(" + marker + ")");
}
}


class Table {
static Bowl b1 = new Bowl(1);


Table() {
System.out.println("Table()");
b2.f(1);
}


void f2(int marker) {
System.out.println("f2(" + marker + ")");
}


static Bowl b2 = new Bowl(2);
}


class Cupboard {
Bowl b3 = new Bowl(3);
static Bowl b4 = new Bowl(4);


Cupboard() {
System.out.println("Cupboard()");
b4.f(2);
}


void f3(int marker) {
System.out.println("f3(" + marker + ")");
}


static Bowl b5 = new Bowl(5);
}


public class StaticInitialization {
public static void main(String[] args) {
System.out.println("Creating new Cupboard() in main");
new Cupboard();
System.out.println("Creating new Cupboard() in main");
new Cupboard();
t2.f2(1);
t3.f3(1);
}


static Table t2 = new Table();
static Cupboard t3 = new Cupboard();

} // /:~

其實這個程序咋一看沒有什麼特別~

但是涉及了兩個知識點：  初始化順序和靜態對象的佔用

通過運行結果來看：首先，初始化順序應該是先靜態變量，再“非靜態”變量   另外無論創建多少個對象，靜態數據只會佔用一份內存！