线程“main”中的异常Java中的java.lang.ArrayIndexOutOfBoundsException：0错误

Question

有人可以告诉我需要做些什么改变才能摆脱这个错误，为什么会发生这种情况？

public class Gambler { 

    public static void main(String[] args) { 
     int stake = Integer.parseInt(args[0]); // gambler's stating bankroll 
     int goal = Integer.parseInt(args[1]); // gambler's desired bankroll 
     int T  = Integer.parseInt(args[2]); // number of trials to perform 

     int bets = 0;  // total number of bets made 
     int wins = 0;  // total number of games won 

     // repeat T times 
     for (int t = 0; t < T; t++) { 

      // do one gambler's ruin simulation 
      int cash = stake; 
      while (cash > 0 && cash < goal) { 
       bets++; 
       if (Math.random() < 0.5) cash++;  // win $1 
       else      cash--;  // lose $1 
      } 
      if (cash == goal) wins++;    // did gambler go achieve desired goal? 
     } 

     // print results 
     System.out.println(wins + " wins of " + T); 
     System.out.println("Percent of games won = " + 100.0 * wins/T); 
     System.out.println("Avg # bets   = " + 1.0 * bets/T); 
    } 

} 

Answer 1

int stake = Integer.parseInt(args[0]); // gambler's stating bankroll 
int goal = Integer.parseInt(args[1]); // gambler's desired bankroll 
int T  = Integer.parseInt(args[2]); // number of trials to perform 

你可能想验证您收到的参数个数。

你可能想看看这个：https://docs.oracle.com/javase/tutorial/essential/environment/cmdLineArgs.html