我需要编写一个程序,该程序从文件中读取以下信息。这些列是:以1/100秒为单位的时间滴答声,音符编号,力度,长度。每行都是不同的注释,我需要编写一个程序来读取它们,然后再次将它们打印出来。我想为Note提供一个公共类,以及它们的数组。
0 60 100 24
25 72 100 24
100 60 100 24
50 60 100 24
75 72 100 24
这是我的新Note课
公共类Note实现Comparable {
private int time;
private int noteNumber;
private int velocity;
private int length;
public Note (int time, int noteNumber, int velocity, int length){
this.time = time;
this.noteNumber = noteNumber;
this.velocity = velocity;
this.length = length;
}
public String toString (){
return String.format("(%s, %d, %d, %d)", time, noteNumber, velocity, length);
}
@Override
public int compareTo(Note note) {
return this.time - note.time;
}
}
这是我用来从文件中读取行的类。我只能正确存储第一行,但是现在在尝试存储其他行时遇到了问题。
公共类MelodyCatcher {
公共静态注释[] n =新注释[5];
public static void main(String[] args) throws IOException {
FileReader fr = new FileReader ("/Users/enricomomo/Desktop/Text/file1.txt");
BufferedReader br = new BufferedReader (fr); //Info stored into a buffer
String ln = null;
while ((ln = br.readLine()) != null) {
StringTokenizer st = new StringTokenizer(ln);
while(st.hasMoreTokens()) // read each number in this line
{
n[0] = new Note(Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()));
n[1] = new Note(Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()));
n[2] = new Note(Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()));
n[3] = new Note(Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()));
n[4] = new Note(Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()));
}
System.out.println("The notes are " + Arrays.toString(n));
Arrays.sort(n);
System.out.println("The notes stored are " + Arrays.toString(n));
}
br.close();
fr.close();
} }
答案 0 :(得分:1)
因此,如果您的行如示例所示,则可以将拆分线简单地分割为Note对象,如下所示:
String[] noteParams = ln.split(" ");
Note n = new Note(noteParams[0], noteParams[1], noteParams[2], noteParams[3]);
我可以按以下方式更改您的代码以读取每一行并填充Note数组:
String ln = null;
while ((ln = br.readLine()) != null) {
StringTokenizer st = new StringTokenizer(ln);
while(st.hasMoreTokens()) // read each number in this line
{
n[0] = new Note(Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()));
n[1] = new Note(Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()));
n[2] = new Note(Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()));
n[3] = new Note(Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()));
n[4] = new Note(Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()),Integer.parseInt(st.nextToken()));
}
System.out.println("The notes are " + Arrays.toString(n));
Arrays.sort(n);
System.out.println("The notes stored are " + Arrays.toString(n));
}
br.close();
fr.close();