try/catch块捕获异常的意义是什么？

import java.io.File;
import java.io.FileReader;
import java.io.IOException;

public class ExceptionHandlingExample {
    public static void main(String[] args) {
        File file = new File("example.txt");
        FileReader fr = null;
        try {
            fr = new FileReader(file);
            int content;
            while ((content = fr.read()) != -1) {
                System.out.print((char) content);
            }
        } catch (IOException e) {
            System.out.println("An error occurred: " + e.getMessage());
        } finally {
            if (fr != null) {
                try {
                    fr.close();
                } catch (IOException ex) {
                    System.out.println("Error closing file: " + ex.getMessage());
                }
            }
        }
    }
}