请看下我的代码正确不？为什么我运行总是这样的结果？

package com.imooc.homework;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

public class FileInputDemo {

public static void main(String[] args) {

// TODO Auto-generated method stub

try {

FileInputStream fil=new FileInputStream("c:\\File\\speech.txt");

int n=0;

int count=0;

System.out.print("文本内容：");

while((n=fil.read())!=-1) {

System.out.print((char)n);

count++;

}

System.out.println("统计结果：speech.txt文件中共有"+count+"个字节");

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch(IOException e) {

e.printStackTrace();

}

}

}

错误结果

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/imooc/homework/FileInputDemo has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(Unknown Source)

at java.security.SecureClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.access$100(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)