使用 BufferedReader 按行读入文档内容
InputStream input_file = null;
try {
input_file = new FileInputStream(fileName);
} catch (FileNotFoundException e) {
System.err.println("输入的文件"+fileName+"不存在");
e.printStackTrace();
}
BufferedReader buf_rd = new BufferedReader(new InputStreamReader(input_file));
String oneLine = buf_rd.readLine();
使用BufferedWriter 向文件中写内容
File file= new File(filePath);
if(!file.exists()) {
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
BufferedWriter outputFile = new BufferedWriter(new FileWriter(file));
outputFile.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
为Point类构造比较器
class SortPointByX implements Comparator{
@Override
public int compare(Object o1, Object o2) {
Point p1 = (Point) o1;
Point p2 = (Point) o2;
if (p1.x()<p2.x())
return -1;
else if (p1.x()>p2.x())
return 1;
else
{
if (p1.y()<p2.y())
return -1;
else if (p1.y()>p2.y())
return 1;
else
return 0;
}
}
}
使用比较器对Map元素进行排序
Map<String, Integer> influenceNum = new HashMap<>();
List<Map.Entry<String, Integer>> peoples = new ArrayList<>(influenceNum.entrySet());
peoples.sort(new Comparator<Map.Entry<String, Integer>>() {
@Override
public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
if (o1.getValue() > o2.getValue())
return 1;
else if (o1.getValue() < o2.getValue())
return -1;
else
return 0;
}
});
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