在java編程中，如何設置文件為只讀？

此示例演示如何使用File類的file.setReadOnly()和file.canWrite()方法設置文件為只讀模式。

package com.yiibai;

import java.io.File;

public class ReadOnlyFile {

public static void main(String[] args) {

File file = new File("F:/worksp/javaexamples/java_files/myfile.txt");

System.out.println(file.setReadOnly());

System.out.println(file.canWrite());

}

}

執行上述示例代碼，將產生以下結果 -

true

false

示例-2

以下是java中設置文件只讀的另一個示例

package com.yiibai;

import java.io.File;

import java.io.IOException;

public class ReadOnlyFile2 {

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

File file = new File("F:/worksp/javaexamples/java_files/myfile.txt");

file.setReadOnly();

if (file.canWrite()) {

System.out.println("This file is writable");

} else {

System.out.println("This file is read only");

}

file.setWritable(true);

if (file.canWrite()) {

System.out.println("This file is writable");

} else {

System.out.println("This file is read only");

}

}

}

執行上述示例代碼，將產生以下結果 -

This file is read only

This file is writable

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