FileReader fileReader = new FileReader("test.t"); BufferedReader bufferedReader = new BufferedReader(fileReader); do { String str = bufferedReader.readLine(); if(str == null) break; System.out.println(str); } while(true);怀疑你读出的方法不对或者读出来的结果放到没有实现List接口的容器里了
这是读取的部分:自己加写必要的判断处理.import java.util.*; import java.io.*;public class Test { public static void main(String[] args) throws IOException { Scanner scr = new Scanner(new FileReader("1.txt")); String[] as = new String[2]; TreeMap<Integer, String> sm = new TreeMap<Integer, String>(); while (scr.hasNextLine()) { as = scr.nextLine().split("[ ]"); sm.put(Integer.parseInt(as[1]), as[0]); } scr.close(); System.out.println(sm); } }
FileWriter fileWriter = new FileWriter(new String("test.t"));
fileWriter.write("张二 8\n");
fileWriter.write("王三 4\n");
fileWriter.write("李四 5\n");
fileWriter.close();
FileReader fileReader = new FileReader("test.t");
BufferedReader bufferedReader = new BufferedReader(fileReader);
do {
String str = bufferedReader.readLine();
if(str == null) break;
System.out.println(str);
} while(true);怀疑你读出的方法不对或者读出来的结果放到没有实现List接口的容器里了
import java.io.*;public class Test { public static void main(String[] args) throws IOException {
Scanner scr = new Scanner(new FileReader("1.txt"));
String[] as = new String[2];
TreeMap<Integer, String> sm = new TreeMap<Integer, String>();
while (scr.hasNextLine()) {
as = scr.nextLine().split("[ ]");
sm.put(Integer.parseInt(as[1]), as[0]);
}
scr.close();
System.out.println(sm);
}
}
王三 4
李四 5
青书 10
亮亮 1import java.io.*;
import java.util.*;class testFileSort{
public static void main(String []args){
BufferedReader input=null;
Set<Person> s=new TreeSet<Person>(new PersonComparator());
try{
input=new BufferedReader(new FileReader("d:/data.txt"));
String buf;
while((buf=input.readLine())!=null){
String name=null;
int num=0;
StringTokenizer st=new StringTokenizer(buf);
while(st.hasMoreTokens()){
name = st.nextToken();
num = Integer.parseInt(st.nextToken());
}
s.add(new Person(name,num));
}
}catch(FileNotFoundException e){
System.out.println("Can't find the file!!!");
}catch(IOException e){
e.printStackTrace();
}finally{
if(input!=null){
try{
input.close();
}catch(IOException e){}
}
}
Iterator<Person> it=s.iterator();
for(int i=0;i<s.size();i++){
System.out.println(it.next());
}
}
}class Person{
private String name;
private int num;
public Person(String n,int num){
name=n;
this.num=num;
}
public int getNum(){
return num;
}
public String toString(){
return "Name:"+name+" Num:"+num;
}
}class PersonComparator implements Comparator<Person>{
public int compare(Person o1,Person o2){
return o1.getNum()-o2.getNum();
}}