我正在做家庭作业，我几乎完成了它。这里的最后一部分是创建一个文件，从该文件中读取，然后使用其中的内容执行一些计算。根据 API 和几个站点，我查看了我的语法是正确的，但由于某种原因，它没有按预期执行。任何能引导我朝着正确方向前进的帮助将不胜感激。我收到了读写的异常错误。
try{
//In the space below (between Marker 2 and Marker 3) declare an
//ObjectOutputStream object called "outFile" for the purpose of
//writing Fraction objects into a file called "fraction.out"
//Marker 2
FileOutputStream fos = new FileOutputStream("fraction.out");
ObjectOutputStream outFile = new ObjectOutputStream(fos);
//Marker 3
score += 5;
outFile.writeObject(F[1]);
outFile.writeObject(F[2]);
outFile.writeObject(F[3]);
outFile.close();
}
catch(Exception e){
System.out.println("Could not write objects to file");
}
try{
//In the space below (between Marker 4 and Marker 5) declare an
//ObjectInputStream object called "inFile" for the purpose of
//reading Fraction objects from a file called "fraction.out"
//Marker 4
ObjectInputStream inFile =
new ObjectInputStream(new FileInputStream("fraction.out"));
//Marker 5
score += 5;
//In the space below (between Marker 6 and Marker 7) Complete
//statements that read three fraction objects from the file
//as F[5], F[6], and F[7]
//Marker 6
f[5] = (Fraction) inFile.readObject();
f[6] = (Fraction) inFile.readObject();
f[7] = (Fraction) inFile.readObject();
//Marker 7
inFile.close();
F[4] = F[5].multiply(F[6]).multiply(F[7]);
score += 5;
System.out.println("step 12:\tf4 = " + F[4]);
}
catch (Exception e){
System.out.println("Could not read objects from file");
}