目前我正在尝试从有关宠物和医生的文本文件中导入数据，并将其发送到我的“petArray”和“doctorArray”。
我对Java非常陌生，因此非常困难。这是我试图做的，但它看起来似乎没有用。
请参阅随附的Java代码和文本文件（链接截图）。
public void readFile() {
String fileName = "VetManagement.txt";
Scanner inputStream = null;
try {
inputStream = new Scanner(new File(fileName));
} catch (FileNotFoundException e) {
System.out.println("Error opening file: " + fileName);
System.exit(0);
}
while (inputStream.hasNextLine()) {
String line = inputStream.nextLine();
String initName = "";
String initSize = "";
String initType = "";
String initDoctor = "";
double initWeight = 0.0;
int initAge = 0;
if (line.equals("Pets")) {
inputStream.nextLine();
if (line.equals("type cat")) {
initType = "cat";
System.out.print(initType);
} else if (line.equals("type dog")) {
initType = "dog";
System.out.print(initType);
}
inputStream.nextLine();
if (line.equals("size small")) {
initSize = "small";
} else if (line.equals("size medium")) {
initSize = "medium";
} else if (line.equals("size large")) {
initSize = "large";
} else System.out.println("error");
inputStream.nextLine();
if (line.startsWith("name")) {
initName = inputStream.next();
} else {
System.out.println("error");
}
inputStream.nextLine();
if (line.startsWith("weight")) {
initWeight = inputStream.nextDouble();
} else {
System.out.println("error");
}
inputStream.nextLine();
if (line.startsWith("age")) {
initAge = inputStream.nextInt();
} else {
System.out.println("error");
}
inputStream.nextLine();
if (line.startsWith("doctor")) {
initDoctor = inputStream.toString();
} else {
System.out.println("error");
}
petArray[sumPets] = new Pet();
petArray[sumPets].setType(initType);
petArray[sumPets].setSize(initSize);
petArray[sumPets].setName(initName);
petArray[sumPets].setWeight(initWeight);
petArray[sumPets].setAge(initAge);
petArray[sumPets].setDoctorName(initDoctor);
} else if (line.equals("Doctors")) ;
}
inputStream.close();
}
TEXT FILE：
Pets type cat size small name Lara weight 4 age 5 doctor Joao type dog size large name Biro weight 15 age 12 doctor Maria type cat size large name Benny weight 7 age 10 doctor no doctor assigned Doctors name Joao specialisation cat name Maria specialisation dog
答案 0 :(得分：1)
if (line.equals("Pets")) {
String nextLine = inputStream.nextLine();
if (nextLine.equals("type cat")) {
initType = "cat";
System.out.print(initType);
}
else if (nextLine.equals("type dog")) {
initType = "dog";
System.out.print(initType);
}
String lineAfterThat=inputStream.nextLine();
您必须先存储每一行，然后才能执行任何操作。 您假设inputStream.nextLine（）一次又一次地读取同一行，但每次使用inputStream.nextLine（）时，它都会读取文件的下一行并最终到达文件末尾。这就是错误。
您不了解Scanner的工作方式 使用此：
if (line.equals("Pets")) {
String nextLine = inputStream.nextLine();
if (nextLine.equals("type cat")) {
initType = "cat";
System.out.print(initType);
}
else if (nextLine.equals("type dog")) {
initType = "dog";
System.out.print(initType);
}
String lineAfterThat=inputStream.nextLine();
if (lineAfterThat.equals("size small")) {
initSize = "small";
} else if (lineAfterThat.equals("size medium")) {
initSize = "medium";
} else if (lineAfterThat.equals("size large")) {
initSize = "large";
} else System.out.println("error");
String nextFirstWord=inputStream.next(); //so that it reads only till the space
if (nextFirstWord.equals("name")) {
initName = inputStream.nextLine();
} else {
System.out.println("error");
}
String ageLineFirstWord = inputStream.next();
if (ageLineFirstWord .equals("age")) {
initAge =inputStream.nextInt();
} else {
System.out.println("error");
}
inputStream.nextLine(); //this is to move the scanner to the nextline
String doctorLineFirstWord = inputStream.next();
if (doctorLineFirstWord .equals("doctor")) {
initDoctor = inputStream.nextLine();
} else {
System.out.println("error");
}
答案 1 :(得分：1)
nextLine可以轻松解决问题，无需过度复杂化工作
由于TEXT FILE包含格式为
的信息type cat
size small
name Lara
weight 4
age 5
doctor Joao
您可以使用
轻松地将信息存储在所需的变量中nextLine = inputStream.nextLine().split(" ");
其中nextLine[0]代表第一列，nextLine[1]代表第二列
我希望这有助于让我知道如果你有任何其他问题这里是完全代码（如果你需要）
public static void readFile() {
String fileName = "F:\\document\\eclipse\\JavaAZ\\src\\VetManagement.txt";
Scanner inputStream = null;
try {
inputStream = new Scanner(new File(fileName));
} catch (FileNotFoundException e) {
System.out.println("Error opening file: " + fileName);
System.exit(0);
}
String[] name = new String[100];
String[] size = new String[100];
String[] type = new String[100];
String[] doctor = new String[100];
double[] weight = new double[100];
int[] age = new int[100];
if (inputStream.hasNextLine()) {
String[] nextLine = inputStream.nextLine().split(" ");
int petCounter = 0;
int doctorCounter = 0;
String workingArray = new String(nextLine[0]);
while(inputStream.hasNextLine()) {
if(workingArray.equals("Pets")) {
nextLine = inputStream.nextLine().split(" ");
if (nextLine[0].equals("Doctors")) {
workingArray = "Doctors";
continue;
}
if (nextLine[0].equals("type")) {
type[petCounter] = nextLine[1];
//System.out.println(type);
}
else System.out.println("type error");
nextLine = inputStream.nextLine().split(" ");
if (nextLine[0].equals("size")) {
size[petCounter] = nextLine[1];
//System.out.println(size);
}
else System.out.println("size error");
nextLine = inputStream.nextLine().split(" ");
if (nextLine[0].equals("name")) {
name[petCounter] = nextLine[1];
//System.out.println(name);
}
else System.out.println("name error");
nextLine = inputStream.nextLine().split(" ");
if (nextLine[0].equals("weight")) {
weight[petCounter] = Double.parseDouble(nextLine[1]);
//System.out.println(weight);
}
else System.out.println("weight error");
nextLine = inputStream.nextLine().split(" ");
if (nextLine[0].equals("age")) {
age[petCounter] = Integer.parseInt(nextLine[1]);
//System.out.println(age);
}
else System.out.println("age error");
nextLine = inputStream.nextLine().split(" ");
if (nextLine[0].equals("doctor")) {
doctor[petCounter] = nextLine[1];
//System.out.println(doctor);
}
else System.out.println("doctor error");
petCounter++;
}
else if(workingArray.equals("Doctors")) {
// CODE HERE
doctorCounter++;
break;
}
}
}
System.out.println("PET NAME: "+name[0]+" and its Weight: "+weight[0]);
inputStream.close();
}