--> List 列表中的自动添加的多余空间长度该怎么去除呢?...(已解决,是char 数组中的空字符)
package com.dragon.java.filesort; import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator; /*
* 将day19-笔记.txt中的所有字符按照码表值排序, 存入另一个文件中
*/
public class Test {
public static void main(String args[]) {
FileReader fr = null;
FileWriter fw = null;
ArrayList<Character> list = new ArrayList<>();
try {
fr = new FileReader(
"C:/Users/xy/Desktop/文件/Java/Java/DailyCode/08-14/src/com/dragon/java/days.txt");
fw = new FileWriter(
"C:/Users/xy/Desktop/文件/Java/Java/DailyCode/08-14/src/com/dragon/java/days01.txt");
char[] buffer = new char[1024];
while (true) {
int temp = fr.read(buffer, 0, buffer.length);
if (temp == -1) {
break;
} else {
// 不能直接遍历buffer 数组,因为当该数组过长是,里面会有空字符!!
// 或者在遍历的时候去除buffer 中的空字符 --> if((int)buffer[i] == 0) --> 空字符在码表中为0.
for (int i = 0; i < temp; i++) {
if (buffer[i] == '\r' || buffer[i] == '\n'
|| buffer[i] == ' ' || buffer[i] == '\t') {
continue;
}
list.add(buffer[i]);
}
}
}
Collections.sort(list);
char[] buffer1 = new char[list.size()];
for (int i = 0; i < list.size(); i++) {
buffer1[i] = list.get(i);
}
fw.write(buffer1, 0, buffer1.length);
} catch (IOException e) {
System.out.println(e);
} finally {
try {
fr.close();
fw.close();
} catch (IOException e) {
System.out.println(e);
}
}
} // 比较器比较字符的大小(可自主修改)
public static class MyCompartor implements Comparator<Character> { @Override
public int compare(Character o1, Character o2) {
// if (o1 == '\n' || o2 == '\n') {
// return 0;
// }
return o1 - o2;
}
} }
--> 还是没有解决多余空间的问题啊...(OK )