class Tag {
Tag(int er) {
System.out.println("Tag(" + er + ")");
}
}class Card {
Tag t1 = new Tag(1); // Before constructor
Card() {
// Indicate we're in the constructor:
System.out.println("Card()");
t4 = new Tag(4);
}
Tag t2 = new Tag(2); // After constructor
void f() {
System.out.println("f()");
}
Tag t3 = new Tag(3); // At end
}public class OrderOfInitialization {
public static void main(String[] args) {
Card t = new Card();
t.f(); // Shows that construction is done
}
}
结果是:
Tag(1)
Tag(2)
Tag(3)
Card()
Tag(4)
f()
是不是因为所有的自变量在被使用调用之前(包括构造函数)要被初始化?所以Tag(2)Tag(3)先于Tag(4)?
Tag(int er) {
System.out.println("Tag(" + er + ")");
}
}class Card {
Tag t1 = new Tag(1); // Before constructor
Card() {
// Indicate we're in the constructor:
System.out.println("Card()");
t4 = new Tag(4);
}
Tag t2 = new Tag(2); // After constructor
void f() {
System.out.println("f()");
}
Tag t3 = new Tag(3); // At end
}public class OrderOfInitialization {
public static void main(String[] args) {
Card t = new Card();
t.f(); // Shows that construction is done
}
}
结果是:
Tag(1)
Tag(2)
Tag(3)
Card()
Tag(4)
f()
是不是因为所有的自变量在被使用调用之前(包括构造函数)要被初始化?所以Tag(2)Tag(3)先于Tag(4)?
可以看 java 编程思想 里关于初始化顺序的一段