关于写文件的问题(星期一结帖)

2007-06-01 05:50:03 320 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Python如何创建一个单链表，以及实现单链表的增，删，改，查操作，以及对单链表的排序功能标题Python如何创建一个单链表，以及实现单链表的增，删，改，查操作，以及对单链表的排序功能 #功能: 实现单链表的构建和功能操作 #定义单链表的类 class Node: """ 思路:将自定义的类视为节点的生成类,实例对象中包含数据部分和指向下一个节点的next """ def __init__(self, val, next=None... 阅读详情

用流的方法写文件和读文件,请给个完整的例子!
(最好测试过可以用)
可用的话全分赠送.

...全文

数据结构：链表（Python语言实现）本文以单链表为例，用python创建一个单链表数据结构，同时定义链表节点的增加、删除、查询和打印操作。阅读详情

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haodouzhe123x 2007-06-04

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结帖了,感谢各位的支持,各位的都可以运行,我都试过了!
特别感谢wbj00(),简单明了!

likgui 2007-06-02

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学习了

liaby 2007-06-01

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不好意思上面那个是写修改前的,重新补充
//产生一个1000个5位以下的随机整数，并将它写如“rand.txt”内，之后输出这一千个数的最大最小值和平均值，并对这一千个数
//排序，保存在原文件中
import java.io.*;
class creat
{
public static void ct() throws IOException
{File f1=new File("rand.txt");
FileWriter fo=new FileWriter(f1);
BufferedWriter out=new BufferedWriter(fo);
for(int i=0;i<1000;i++)
{out.write(Integer.toString((int)(Math.random()*10000)));
out.newLine();
}
out.flush();
out.close();
fo.close();

}
};

class deal
{public static void aver() throws IOException

{ File f1=new File("rand.txt");
FileReader fr=new FileReader(f1);
BufferedReader bfr=new BufferedReader(fr);
String s;long sum=0;int max,min,n;
sum=max=min=Integer.parseInt(bfr.readLine());
while((s=bfr.readLine())!=null)
{n=Integer.parseInt(s);
sum=n+sum;
if(n>max) max=n;
if(n<min) min=n;
}
System.out.println("最大值是："+max);
System.out.println("最小值是："+min);
System.out.println("平均数是："+sum/1000);
fr.close();
bfr.close();}
public static void paixu() throws IOException
{File f1=new File("rand.txt");
File tempfile=new File("temp.txt");
FileReader fr1=new FileReader(f1);
BufferedReader bfr1=new BufferedReader(fr1);
FileWriter fr2=new FileWriter(tempfile);
BufferedWriter bfr2=new BufferedWriter(fr2);
String s=null;int a[]=new int[1000];int i=0,j=0,k=0;
while((s=bfr1.readLine())!=null)
{a[i]=Integer.parseInt(s);
i++;}
fr1.close();
bfr1.close();
f1.delete();
for(i=0;i<1000;i++)
for(j=0;j<1000-i-1;j++)
if(a[j]>a[j+1])
{k=a[j];
a[j]=a[j+1];
a[j+1]=k;
}
for(i=0;i<1000;i++)
{s=Integer.toString(a[i]);
bfr2.write(s);
bfr2.newLine();}
bfr2.flush();
bfr2.close();
fr2.close();

tempfile.renameTo(f1);

}

};

public class file
{public static void main(String args[])
{try{creat.ct();
deal.aver();
deal.paixu();}
catch(IOException e)
{}

}
}

liaby 2007-06-01

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我也是学到文件操作这块儿,刚写个文件操作的,希望对楼主有用,确实你写的有点烦~
//产生一个1000个5位以下的随机整数，并将它写如“rand.txt”内，之后输出这一千个数的最大最小值和平均值，并对这一千个数
//排序，保存在原文件中
import java.io.*;
class creat
{
public static void ct() throws IOException
{File f1=new File("rand.txt");
FileWriter fo=new FileWriter(f1);
BufferedWriter out=new BufferedWriter(fo);
for(int i=0;i<1000;i++)
{out.write(Integer.toString((int)(Math.random()*10000)));
out.newLine();
}
out.flush();
out.close();
fo.close();

}
}
class del
{public static void aver() throws IOException

{ File f1=new File("rand.txt");
FileReader fr=new FileReader(f1);
BufferedReader bfr=new BufferedReader(fr);
String s;long sum=0;int max,min,n;
sum=max=min=Integer.parseInt(bfr.readLine());
while((s=bfr.readLine())!=null)
{n=Integer.parseInt(s);
sum=n+sum;
if(n>max) max=n;
if(n<min) min=n;
}
System.out.println("最大值是："+max);
System.out.println("最小值是："+min);
System.out.println("平均数是："+sum/1000);}
public static void paixu()
{}

};

public class file
{public static void main(String args[])
{try{creat.ct();
del.aver();}
catch(IOException e)
{}

}
}

wbj00 2007-06-01

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楼上的太麻烦的。。。
public void testIo() throws Exception{
File file=new File("d:/file/src.txt"); //要读的文件
InputStream in=new FileInputStream(file);
FileOutputStream out=new FileOutputStream ("d:/file/target.txt");//要写入的文件
byte[] b=new byte[1024];
while((in.read(b))!=-1){ //等于-1说明文件已读完
out.write(b); //写入到文件
}
System.out.println("success...");
in.close();
out.close();
}

吴恒 2007-06-01

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/**
@version 1.11 2004-05-11
@author Cay Horstmann
*/

import java.io.*;
import java.util.*;

public class RandomFileTest
{
public static void main(String[] args)
{
Employee[] staff = new Employee[3];

staff[0] = new Employee("Carl Cracker", 75000, 1987, 12, 15);
staff[1] = new Employee("Harry Hacker", 50000, 1989, 10, 1);
staff[2] = new Employee("Tony Tester", 40000, 1990, 3, 15);

try
{
// save all employee records to the file employee.dat
DataOutputStream out = new DataOutputStream(new FileOutputStream("employee.dat"));
for (Employee e : staff)
e.writeData(out);
out.close();

// retrieve all records into a new array
RandomAccessFile in = new RandomAccessFile("employee.dat", "r");
// compute the array size
int n = (int)(in.length() / Employee.RECORD_SIZE);
Employee[] newStaff = new Employee[n];

// read employees in reverse order
for (int i = n - 1; i >= 0; i--)
{
newStaff[i] = new Employee();
in.seek(i * Employee.RECORD_SIZE);
newStaff[i].readData(in);
}
in.close();

// print the newly read employee records
for (Employee e : newStaff)
System.out.println(e);
}
catch(IOException e)
{
e.printStackTrace();
}
}
}

class Employee
{
public Employee() {}

public Employee(String n, double s, int year, int month, int day)
{
name = n;
salary = s;
GregorianCalendar calendar = new GregorianCalendar(year, month - 1, day);
hireDay = calendar.getTime();
}

public String getName()
{
return name;
}

public double getSalary()
{
return salary;
}

public Date getHireDay()
{
return hireDay;
}

/**
Writes employee data to a data output
@param out the data output
*/
public void raiseSalary(double byPercent)
{
double raise = salary * byPercent / 100;
salary += raise;
}

public String toString()
{
return getClass().getName()
+ "[name=" + name
+ ",salary=" + salary
+ ",hireDay=" + hireDay
+ "]";
}

/**
Writes employee data to a data output
@param out the data output
*/
public void writeData(DataOutput out) throws IOException
{
DataIO.writeFixedString(name, NAME_SIZE, out);
out.writeDouble(salary);

GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(hireDay);
out.writeInt(calendar.get(Calendar.YEAR));
out.writeInt(calendar.get(Calendar.MONTH) + 1);
out.writeInt(calendar.get(Calendar.DAY_OF_MONTH));
}

/**
Reads employee data from a data input
@param in the data input
*/
public void readData(DataInput in) throws IOException
{
name = DataIO.readFixedString(NAME_SIZE, in);
salary = in.readDouble();
int y = in.readInt();
int m = in.readInt();
int d = in.readInt();
GregorianCalendar calendar = new GregorianCalendar(y, m - 1, d);
hireDay = calendar.getTime();
}

public static final int NAME_SIZE = 40;
public static final int RECORD_SIZE = 2 * NAME_SIZE + 8 + 4 + 4 + 4;

private String name;
private double salary;
private Date hireDay;
}

class DataIO
{
public static String readFixedString(int size, DataInput in)
throws IOException
{
StringBuilder b = new StringBuilder(size);
int i = 0;
boolean more = true;
while (more && i < size)
{
char ch = in.readChar();
i++;
if (ch == 0) more = false;
else b.append(ch);
}
in.skipBytes(2 * (size - i));
return b.toString();
}

public static void writeFixedString(String s, int size, DataOutput out)
throws IOException
{
int i;
for (i = 0; i < size; i++)
{
char ch = 0;
if (i < s.length()) ch = s.charAt(i);
out.writeChar(ch);
}
}
}

关于写文件的问题(星期一结帖)

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