mismatch() Java.nio.file.Files Utility 类的方法和例子

在Java jdk-12 的Java.nio.file.Files 类中新增了mismatch() 方法。该方法主要用于比较两个文件从头开始的每个字节数据，返回位不同的点。如果该位在任何时候都没有不同，则它返回“-1L”，表明文件是相同的，并且是彼此的精确副本。

该方法主要以文件的路径为输入，返回一个表示位不匹配位置的long值。所以这个方法的声明如下所示：

long position = Files.mismatch(Path path1, Path path2);

This method requires that the two files two be compared should have the correct path given and their sizes should be the same along with the format. 

示例 1：

文件是：

Java

// Java program to demonstrate the usage
// of mismatch() method
 
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.*;
 
// save file as the name of GFG2
public class GFG2 {
   
    // main class
    public static void main(String[] args) throws Exception
    {
        // getting the file path to the respective two files
        Path filePath1 = Path.of("C:\\Users\\Dipak\\Desktop\\gfg.txt");
        Path filePath2 = Path.of("c:\\Users\\Dipak\\Desktop\\gfg2.txt");
       
        // calling the mismatchfunction
        long mis_match = Files.mismatch(filePath1, filePath2);
       
        // printing the output result.
        if (mis_match == -1)
            System.out.println("No mismatch found in the files");
        else
            System.out.println("mismatch found");
    }
}

输出：

示例 2：

文件是：

Java

// Java program to demonstrate the
// usage of mismatch() method
 
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.*;
 
// save file as the name of GFG2
public class GFG2 {
 
    // main class
    public static void main(String[] args) throws Exception
    {
        // getting the file path to the respective two files
        Path filePath1 = Path.of("C:\\Users\\Dipak\\Desktop\\gfg.txt");
        Path filePath2 = Path.of("c:\\Users\\Dipak\\Desktop\\gfg2.txt");
       
        // calling the mismatchfunction
        long mis_match = Files.mismatch(filePath1, filePath2);
       
        // printing the output result.
        if (mis_match == -1)
            System.out.println("No mismach found in the files");
        else
            System.out.println("mismatch found");
    }
}

输出：

输出