java - 在java中读取文件时遇到问题

Question

我在用 Java 读取文件时遇到一些问题。

文件是什么样的:

Answer 1:
1. This is an apple
2. Something
Answer 2:
1. This is a cool website 
2. I love banana
3. This is a table
4. Programming is fun
Answer 3. 
1. Hello World
.... 

我想要做的是将它们分成两个项目:一是答案编号；另一份是答案列表。

假设我有一个名为 Answer 的对象类:答案编号字符串答案列表。

这就是我迄今为止在将代码放入对象类之前调试代码所做的事情。但我无法得到正确的结果

public void reader(String file) throws FileNotFoundException, IOException {
    FileReader fR = new FileReader(file);
    BufferedReader bR = new BufferedReader(fR);
    String line = null;

    int count = 0 ;
    String blockNum = "";
    String printState = "" ;
    while ((line = bR.readLine()) != null) {
        if(line.contains("Answer")){
            //System.out.println("Contain Answer statement: " + line);
            count++;
            blockNum = line; 
            printState = "";
        }
        else{
            //System.out.println("No Answer Statement: " + line);
            printState += line + " / " ;
        }

        System.out.println( count + " " + blockNum + "   " + printState );
    }

    // Close the input stream
    bR.close();
    fR.close();
}

我很确定我在编码时做了一些愚蠢的事情。我不太确定如何阅读它以便将其分开。

现在的输出如下所示:

1 Answer 1:   
1 Answer 1:   1. This is an apple / 
1 Answer 1:   1. This is an apple / 2. Something / 
2 Answer 2:   
2 Answer 2:   1. This is a cool website  / 
2 Answer 2:   1. This is a cool website  / 2. I love banana / 
2 Answer 2:   1. This is a cool website  / 2. I love banana / 3. This is a table / 
2 Answer 2:   1. This is a cool website  / 2. I love banana / 3. This is a table / 4. Programming is fun / 
3 Answer 3.    
3 Answer 3.    1. Hello World / 

但我希望输出是这样的:

1 Answer 1:   1. This is an apple / 2. Something / 
2 Answer 2:   1. This is a cool website  / 2. I love banana / 3. This is a table / 4. Programming is fun /    
3 Answer 3.    1. Hello World / 

Answer 1

您正在为您读取的每一行输入打印一行输出。尝试将 println 移动到检查答案的循环部分内，以确保仅打印每个答案/答案值集一次。例如:

if(line.contains("Answer")) {
    if (printState != "") {
        System.out.println(count + " " + blockNum + "   " + printState);
    }
    ...
}

编辑:退出 while 循环时您还需要进行打印，以确保打印最后一个答案/答案值集。