1. 程式人生 > >靜態資料初始化

靜態資料初始化

無論建立多少個物件,靜態資料都只佔用一份儲存區域。static關鍵字不能作用於區域性變數,只作用於域。

初始化的順序為,先靜態物件,而後是非靜態物件。

class Bowl {
	Bowl(int marker){
		System.out.println("Bowl("+marker+")");
	}
	void f1(int marker){
		System.out.println("f1("+marker+")");
	}
}
class Table {
	static Bowl bowl1 = new Bowl(1);
	Table(){
		System.out.println("Table()");
	}
	void f2(int marker){
		System.out.println("f2("+marker+")");
	}
	static Bowl bowl2 = new Bowl(2);
}
class Cupboard{
	Bowl bowl3 = new Bowl(3);
	static Bowl bowl4 = new Bowl(4);
	Cupboard(){
		System.out.println("Cupboard()");
		bowl4.f1(2);
	}
	void f3(int marker){
		System.out.println("f3("+marker+")");
	}
	static Bowl bowl5 = new Bowl(5);
}
public class StaticInitialization {

	public static void main(String[] args) {
		System.out.println("Creatting new Cupboard() in main");
		new Cupboard();
		System.out.println("Creatting new Cupboard() in main");
		new Cupboard();
		table.f2(1);
		cupboard.f3(1);
	}
	static Table table = new Table();
	static Cupboard cupboard = new Cupboard();
}

/*

*/

Bowl(1)
Bowl(2)
Table()
Bowl(4)
Bowl(5)
Bowl(3)
Cupboard()
f1(2)
Creatting new Cupboard() in main
Bowl(3)
Cupboard()
f1(2)
Creatting new Cupboard() in main
Bowl(3)
Cupboard()
f1(2)
f2(1)
f3(1)