java - Java 中的变量可能未初始化错误

Question

import java.util.Random;

public class dice
{
  private int times;
  private int roll;
  private int side;
  Random roller = new Random();   

  public void setTimes(int sides)
  {
    times = sides;
  }

  public void setSides(int die)
  {
    side = die;
  }

  public int getRoll()
  { 
    int total; //here it is
    int c = 0;
    while (c <= times)
    {
      c = c + 1;
      int rol = 0;
      roll = roller.nextInt(side) + 1;
      rol = rol + roll;
      total = rol; //here it is initialized
    }
    return total; //here it says variable not initialized
  }
}

Answer 1

while 循环的内部不能保证执行 - 例如，如果 times 由于编程错误而小于零。编译器知道这一点，因此在确定 total 是否已初始化时它不会依赖 while 循环。