java代码比较test1.txt及test2.txt文件的内容

以下是比较两个文件内容的Java代码：

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class FileComparator {
    public static void main(String[] args) throws IOException {
        String file1 = "test1.txt";
        String file2 = "test2.txt";

        BufferedReader reader1 = new BufferedReader(new FileReader(file1));
        BufferedReader reader2 = new BufferedReader(new FileReader(file2));

        String line1 = reader1.readLine();
        String line2 = reader2.readLine();

        boolean areEqual = true;
        int lineNum = 1;

        while (line1 != null || line2 != null) {
            if (!line1.equals(line2)) {
                areEqual = false;
                System.out.println("Content in file " + file1 + " is not equal to content in file " + file2 +
                        " at line " + lineNum);
                System.out.println(file1 + ": " + line1);
                System.out.println(file2 + ": " + line2);
            }

            line1 = reader1.readLine();
            line2 = reader2.readLine();
            lineNum++;
        }

        reader1.close();
        reader2.close();

        if (areEqual) {
            System.out.println("Content of both files is equal.");
        }
    }
}

这个程序会读取两个文件的内容，并逐行进行比较。如果发现两个文件的某一行不相同，程序会输出该行在文件中的行号以及该行的内容。如果两个文件完全相同，则程序会输出一条消息表明它们的内容是相等的。