怎樣用java程序?qū)崿F(xiàn)文件拷貝

通過(guò)輸入輸出流解決此問(wèn)題，具體的可以查看JDK的API，實(shí)在不會(huì)的話(huà)，百度一下應(yīng)該都有一堆這方面的代碼。

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java 代碼實(shí)現(xiàn)對(duì)象的拷貝

package com.teven.comefromnet;

/**

* Name:C.java

* Founction:

* Created:2011-9-15

* @author :teven

*/

public class CloneTest {

static class A implements Cloneable{

int i=1;

@Override

protected A clone() throws CloneNotSupportedException {

return (A)super.clone();

}

}

static class B extends A{

int j=2;

@Override

protected B clone() throws CloneNotSupportedException {

return (B)super.clone();

}

}

static class C extends B{

int k=3;

@Override

protected C clone() throws CloneNotSupportedException {

return (C)super.clone();

}

}

public static void main(String[] args) throws CloneNotSupportedException {

A a = new CloneTest.A();

A aa = (A) a.clone();

System.out.println("before clone a.i = "+ a.i+" after clone aa.i=" +aa.i);

B b = new CloneTest.B();

B bb= (B) b.clone();

System.out.println("before clone b.j = "+ b.j+" after clone bb.j=" +bb.j);

C c = new CloneTest.C();

C cc= (C) c.clone();

System.out.println("before clone c.k = "+ c.k+" after clone cc.k=" +cc.k);

}

}

java編程 編寫(xiě)一個(gè)文件拷貝的程序

程序如下：

--------------------------------------------------------------

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.FileNotFoundException;

public class copy {

public static void main (String args[]) {

if (args.length 2) {

System.out.println("請(qǐng)按以下格式輸入：java copy 原路徑 目標(biāo)路徑");

return;

}

try {

FileReader reader = new FileReader(args[0]);

FileWriter writer = new FileWriter(args[1]);

int c = -1;

while ((c = reader.read()) != -1)

writer.write(c);

reader.close();

writer.close();

} catch (FileNotFoundException fnfe) {

System.out.println("原文件不存在！");

return;

} catch (IOException ioe) {

System.out.println("拷貝失??！");

return;

}

System.out.println("拷貝成功！");

}

}

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運(yùn)行程序時(shí)輸入如下命令：

java copy 原文件路徑 新文件路徑

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截圖如下：