靜態資料初始化
阿新 • • 發佈:2019-01-03
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)