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我正在阅读Java How to Program第10版并阅读前几章。对于这个例子,我们展示了如何确保SecureRandom类,但是有一部分让我感到困惑。为什么你会使用声明一个对象引用变量static final?
// Fig. 6.8: Craps.java
// Craps class simulates the dice game craps.
import java.security.SecureRandom;
public class Craps
{
// create secure random number generator for use in method rollDice
private static final SecureRandom randomNumbers = new SecureRandom();
// enum type with constants that represent the game status
private enum Status { CONTINUE, WON, LOST };
// constants that represent common rolls of the dice
private static final int SNAKE_EYES = 2;
private static final int TREY = 3;
private static final int SEVEN = 7;
private static final int YO_LEVEN = 11;
private static final int BOX_CARS = 12;
// plays one game of craps
public static void main(String[] args)
{
int myPoint = 0; // point if no win or loss on first roll
Status gameStatus; // can contain CONTINUE, WON or LOST
int sumOfDice = rollDice(); // first roll of the dice
// determine game status and point based on first roll
switch (sumOfDice)
{
case SEVEN: // win with 7 on first roll
case YO_LEVEN: // win with 11 on first roll
gameStatus = Status.WON;
break;
case SNAKE_EYES: // lose with 2 on first roll
case TREY: // lose with 3 on first roll
case BOX_CARS: // lose with 12 on first roll
gameStatus = Status.LOST;
break;
default:
gameStatus = Status.CONTINUE; // game is not over
myPoint = sumOfDice; // remember the point
System.out.printf("Point is %d%n", myPoint);
break;
}
// while game is not complete
while (gameStatus == Status.CONTINUE) // not WON or LOST
{
sumOfDice = rollDice(); // roll dice again
// determine game status
if (sumOfDice == myPoint) // win by making point
gameStatus = Status.WON;
else if (sumOfDice == SEVEN) // lose by rolling 7 before point
gameStatus = Status.LOST;
}
// display won or lost message
if (gameStatus == Status.WON)
System.out.println("Player wins");
else
System.out.println("Player loses");
}
// roll dice, calculate sum and display results
public static int rollDice()
{
// pick random die values
int die1 = 1 + randomNumbers.nextInt(6); // first die roll
int die2 = 1 + randomNumbers.nextInt(6); // second die roll
int sum = die1 + die2; // sum of die values
// display results of this roll
System.out.printf("Player rolled %d + %d = %d%n", die1, die2, sum);
return sum;
}
} // end class Craps
从书,它提到,它被声明为类的私有静态最终变量,SecureRandom
使一个物体总是被用来调用方法,rollDice()
。如果有一个包含Craps
类的多个实例的程序,它们将共享这一个对象。我的问题是有没有机会需要类SecureRandom
的多个实例?下一个问题将是因为这是一个对象引用变量SecureRandom
,为什么它仍然被称为Craps
的变量?