Java文件类boolean setLastModified（long set_new

Java文件类boolean setLastModified（long set_new_time）方法，包含示例

文件类boolean setLastModified(long set_new_time) (File Class boolean setLastModified(long set_new_time))

This method is available in package java.io.File.setLastModified(long set_new_time).
软件包java.io.File.setLastModified(long set_new_time)中提供了此方法。
This method is used to sets the last modified time of the given file.
此方法用于设置给定文件的最后修改时间。
In other words, Every file has some last modified time if file exists but by using this method we can change the last modified time of the file with the given new time.
换句话说，如果文件存在，则每个文件都有最后修改时间，但是通过使用此方法，我们可以使用给定的新时间来更改文件的最后修改时间。
The return type of this method is Boolean so it returns true if file last modification is set successfully else return false.
此方法的返回类型为Boolean，因此如果成功设置了文件上次修改，则返回true，否则返回false。

Syntax:

句法：

    boolean setLastModified(long  set_new_time){
}

Parameter(s):

参数：

We pass only one object as a parameter in the method of the file i.e. set_new_time (We will set new time as last modified time of the file).

在文件方法中，我们仅传递一个对象作为参数，即set_new_time (我们将新时间设置为文件的最后修改时间)。

Return value:

返回值：

The return type of this method is Boolean, it returns true if the given time is set successfully of last modification of the file else it returns false.

此方法的返回类型为Boolean ，如果成功设置了文件的上一次修改的给定时间，则返回true ，否则返回false 。

Java程序演示setLastModified()方法的示例 (Java program to demonstrate example of setLastModified() method)

import java.io.*;
public class SetFileLastModifiedTime {
public static void main(String[] args) {
try {
// Create a file object file1
File file1 = new File("E:\\Programs\\myjava.txt");
// Previous Last Modified Time Of The File1
System.out.println("The Previous Last Modification Time Of File1 is : " + file1.lastModified());
// By using setLastModified(long set_new_time) method sets 
// new last modified time of the file.
System.out.println("The New Last Modification Time has set : " + file1.setLastModified(2000000));
// Display New Last Modified Time Of The File1
System.out.println("The New Last Modification Time Of File1 is : " + file1.lastModified());
} catch (Exception e) {
System.err.println("An error occurred");
e.printStackTrace();
}
}
}

Output

输出量

E:\Programs>javac SetFileLastModifiedTime.java
E:\Programs>java SetFileLastModifiedTime 
The Previous Last Modification Time Of File1 is : 1000000
The New Last Modification Time Of File1 has set : true
The New Last Modification Time Of File1 is : 2000000