public void printFile(String filePath) {
    File file = new File(filePath);
 
    try (FileReader fr = new FileReader(file))
    {
        int content;
        while ((content = fr.read()) != -1) {
            System.out.print((char) content);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}

printFile("Effective-java.txt");

public void printFile(String filePath) throw IOException {
    File file = new File(filePath);
    FileReader fr = new FileReader(file);
    int content;
    while ((content = fr.read()) != -1) {
        System.out.print((char) content);
    } 
}

try
{
    printFile("Effective-java.txt");
} catch (IOException e) {
    System.out.print("해당 파일을 찾을 수 없습니다");
}

public Result getSomething() throw IOException {
    // select query
    if (result == null) {
        return Optional.empty();
    }

    return Optional.of(result);
}

Result result = getSomething().orElseThrow(() -> new RuntimeException());

public void printFile(String filePath) {
    File file = new File(filePath);
 
    try (FileReader fr = new FileReader(file)) {
        int content;
        while ((content = fr.read()) != -1) {
            System.out.print((char) content);
        }
    } catch (IOException e) {
        throw new RuntimeException(e)
    }
}

printFile("Effective-java.txt");