package reusing;//: reusing/BlankFinal.java

// "Blank" final fields.

class Poppet {

private int i;

Poppet(int ii) { i = ii; }

}

public class BlankFinal {

private final int i = 0; // Initialized final

private final int j; // Blank final、、没有在申明时赋值 的final称为final；即使这里不复制，构造函数那边也必须赋值，初始化。

private final Poppet p; // Blank final reference

// Blank finals MUST be initialized in the constructor://构造函数这边必须初始化，blank field .

public BlankFinal() {

j = 1; // Initialize blank final

p = new Poppet(1); // Initialize blank final reference

}

public BlankFinal(int x) {

j = x; // Initialize blank final

p = new Poppet(x); // Initialize blank final reference

}

public static void main(String[] args) {

new BlankFinal();

new BlankFinal(47);

}

} ///:~