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CentOS8使用yum安装OpenJDK1.8版本 1.下载OpenJDK先执行以下命令，查看OpenJDK版本yum --showduplicate list java*yum install java-1.8.0-openjdk* -y2.配置环境变量编辑profile文件vim /etc/profile在最末尾输入一下内容export JAVA_HOME=/usr/lib/jvm/java export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/jre/lib/rt.jar export PATH=$PATH:$JAVA_HOME/bin生效环境变量source /etc/profile3.验证java -version看到如下内容，说明配置正确 -
JDK 8（Java SE Development Kit）全平台全版本安装包免费下载 Java虽然都更新到19了，但是我们日常使用比较多的还是Java8，虽然Spring Boot 3最低依赖都是Java17了，但是Java8的群体依然十分庞大。Java8（又称JDK 1.8）是Oracle于2014年3月19日发布正式版，是一个重要的长期支持版本(LTS)，在生产环境中得到了普遍的运用；Java8 相比之前版本，新增了如下功能Lambda 表达式；使用函数式编程，使代码更少，更简洁；Data Time API 改进，优化对时间的处理新增 Stream API新增 Optional 类提供新的 Nashorn JavaScript 引擎，允许在 JVM 上运行特定的JS应用默认方法方法参数反射Oracle JDK 8u311下载安装平台下载地址密码Windows x64 64位jdk-8u311-windows-x648899Windows x86 32位jdk-8u311-windows-i5868899Linux x64 64位jdk-8u311-linux-x648899Linux x86 32位jdk-8u311-linux-i5868899Linux aarch 64位jdk-8u311-linux-aarch648899Linux arm 32位jdk-8u311-linux-arm328899MacOS x64 64位jdk-8u311-macosx-x648899Solarisjdk-8u311-solaris8899Oracle JDK 8u301下载安装平台下载地址下载密码Windows x64 64位jdk-8u301-windows-x648899Windows x86 32位jdk-8u301-windows-i5868899Linux x64 64位jdk-8u301-linux-x648899Linux x86 32位jdk-8u301-linux-i5868899Linux aarch64 64位jdk-8u301-linux-aarch648899Linux arm 32位jdk-8u301-linux-arm328899MacOS x64 64位jdk-8u301-macosx-x648899Solarisjdk-8u301-solaris8899Oracle JDK 8u291下载安装平台下载地址下载密码Windows x64 64位jdk-8u291-windows-x648899Windows x86 32位jdk-8u291-windows-i5868899Linux x64 64位jdk-8u291-linux-x648899Linux x86 32位jdk-8u291-linux-i5868899Linux aarch64 64位jdk-8u291-linux-aarch648899Linux arm 32位jdk-8u291-linux-arm328899MacOS x64 64位jdk-8u291-macosx8899Solarisjdk-8u291-solaris8899Oracle JDK 8u281下载安装平台下载地址密码Windows x64 64位jdk-8u281-windows-x648899Windows x86 32位jdk-8u281-windows-i5868899Linux x64 64位jdk-8u281-linux-x648899Linux x86 32位jdk-8u281-linux-i5868899Linux aarch64 64位jdk-8u281-linux-aarch648899Linux arm 32位jdk-8u281-linux-arm328899MacOS x64 64位jdk-8u281-macosx-x648899Solarisjdk-8u281-solaris8899Oracle JDK 8u271下载安装平台下载地址密码Windows x64 64位jdk-8u271-windows-x648899Windows x86 32位jdk-8u271-windows-i5868899Linux x64 64位jdk-8u271-linux-x648899Linux x86 32位jdk-8u271-linux-i5868899Linux aarch64 64位jdk-8u271-linux-aarch648899Linux arm 32位jdk-8u271-linux-arm328899MacOS x64 64位jdk-8u271-macosx-x648899Solarisjdk-8u271-solaris8899Oracle JDK 8u261下载安装平台下载地址密码Windows x64 64位jdk-8u261-windows-x648899Windows x86 32位jdk-8u261-windows-i5868899Linux x64 64位jdk-8u261-linux-x648899Linux x86 32位jdk-8u261-linux-i5868899Linux arm 64位jdk-8u261-linux-arm648899Linux arm 32位jdk-8u261-linux-arm328899MacOS x64 64位jdk-8u261-macosx-x648899Solarisjdk-8u261-solaris8899Oracle JDK 8u251下载安装平台下载地址密码Windows x64 64位jdk-8u251-windows-x648899Windows x86 32位jdk-8u251-windows-i5868899Linux x64 64位jdk-8u251-linux-x648899Linux x86 32位jdk-8u251-linux-i5868899Linux arm 64位jdk-8u251-linux-arm648899Linux arm 32位jdk-8u251-linux-arm328899MacOS x64 64位jdk-8u251-macosx-x648899Solarisjdk-8u251-solaris8899Oracle JDK 8u241下载安装平台下载地址密码Windows x64 64位jdk-8u241-windows-x648899Windows x86 32位jdk-8u241-windows-i5868899Linux x64 64位jdk-8u241-linux-x648899Linux x86 32位jdk-8u241-linux-i5868899Linux arm 64位jdk-8u241-linux-arm648899Linux arm 32位jdk-8u241-linux-arm328899MacOS x64 64位jdk-8u241-macosx-x648899Solarisjdk-8u241-solaris8899Oracle JDK 8u231下载安装平台下载地址密码Windows x64 64位jdk-8u231-windows-x648899Windows x86 32位jdk-8u231-windows-i5868899Linux x64 64位jdk-8u231-linux-x648899Linux x86 32位jdk-8u231-linux-i5868899Linux arm 64位jdk-8u231-linux-arm648899Linux arm 32位jdk-8u231-linux-arm328899MacOS x64 64位jdk-8u231-macosx-x648899Solarisjdk-8u231-solaris8899Oracle JDK 8u221下载安装平台下载地址密码Windows x64 64位jdk-8u221-windows-x648899Windows x86 32位jdk-8u221-windows-i5868899Linux x64 64位jdk-8u221-linux-x648899Linux x86 32位jdk-8u221-linux-i5868899Linux arm 64位jdk-8u221-linux-arm648899Linux arm 32位jdk-8u221-linux-arm328899MacOS x64 64位jdk-8u221-macosx-x648899Solarisjdk-8u221-solaris8899Oracle JDK 8u212下载安装平台下载地址密码Windows x64 64位jdk-8u212-windows-x648899Windows x86 32位jdk-8u212-windows-i5868899Linux x64 64位jdk-8u212-linux-x648899Linux x86 32位jdk-8u212-linux-i5868899Linux arm 64位jdk-8u212-linux-arm648899Linux arm 32位jdk-8u212-linux-arm328899MacOS x64 64位jdk-8u212-macosx-x648899Solarisjdk-8u212-solaris8899Oracle JDK 8u211下载安装平台下载地址密码Windows x64 64位jdk-8u211-windows-x648899Windows x86 32位jdk-8u211-windows-i5868899Linux x64 64位jdk-8u211-linux-x648899Linux x86 32位jdk-8u211-linux-i5868899Linux arm 64位jdk-8u211-linux-arm648899Linux arm 32位jdk-8u211-linux-arm328899MacOS x64 64位jdk-8u211-macosx-x648899Solarisjdk-8u211-solaris8899Oracle JDK 8u202下载安装平台下载地址密码Windows x64 64位jdk-8u202-windows-x648899Windows x86 32位jdk-8u202-windows-i5868899Linux x64 64位jdk-8u202-linux-x648899Linux x86 32位jdk-8u202-linux-i5868899Linux arm 64位jdk-8u202-linux-arm648899Linux arm 32位jdk-8u202-linux-arm328899MacOS x64 64位jdk-8u202-macosx-x648899Solarisjdk-8u202-solaris8899Oracle JDK 8u201下载安装平台下载地址密码Windows x64 64位jdk-8u201-windows-x648899Windows x86 32位jdk-8u201-windows-i5868899Linux x64 64位jdk-8u201-linux-x648899Linux x86 32位jdk-8u201-linux-i5868899Linux arm 64位jdk-8u201-linux-arm648899Linux arm 32位jdk-8u201-linux-arm328899MacOS x64 64位jdk-8u201-macosx-x648899Solarisjdk-8u201-solaris8899Oracle JDK 8u192下载安装平台下载地址密码Windows x64 64位jdk-8u192-windows-x648899Windows x86 32位jdk-8u192-windows-i5868899Linux x64 64位jdk-8u192-linux-x648899Linux x86 32位jdk-8u192-linux-i5868899Linux arm 64位jdk-8u192-linux-arm648899Linux arm 32位jdk-8u192-linux-arm328899MacOS x64 64位jdk-8u192-macosx-x648899Solaris*jdk-8u192-solaris8899Oracle JDK 8u191下载安装平台下载地址密码Windows x64 64位jdk-8u191-windows-x648899Windows x86 32位jdk-8u191-windows-i5868899Linux x64 64位jdk-8u191-linux-x648899Linux x86 32位jdk-8u191-linux-i5868899Linux arm 64位jdk-8u191-linux-arm648899Linux arm 32位jdk-8u191-linux-arm328899MacOS x64 64位jdk-8u191-macosx-x648899Solarisjdk-8u191-solaris8899Oracle JDK 8u181下载安装平台下载地址密码Windows x64 64位jdk-8u181-windows-x648899Windows x86 32位jdk-8u181-windows-i5868899Linux x64 64位jdk-8u181-linux-x648899Linux x86 32位jdk-8u181-linux-i5868899Linux arm 64位jdk-8u181-linux-arm648899Linux arm 32位jdk-8u181-linux-arm328899MacOS x64 64位jdk-8u181-macosx-x648899Solaris*jdk-8u181-solaris8899Oracle JDK 8u172下载安装平台下载地址密码Windows x64 64位jdk-8u172-windows-x648899Windows x86 32位jdk-8u172-windows-i5868899Linux x64 64位jdk-8u172-linux-x648899Linux x86 32位jdk-8u172-linux-i5868899Linux arm 64位jdk-8u172-linux-arm648899Linux arm 32位jdk-8u172-linux-arm328899MacOS x64 64位jdk-8u172-macosx-x648899Solaris*jdk-8u172-solaris8899Oracle JDK 8u171下载安装平台下载地址密码Windows x64 64位jdk-8u171-windows-x648899Windows x86 32位jdk-8u171-windows-i5868899Linux x64 64位jdk-8u171-linux-x648899Linux x86 32位jdk-8u171-linux-i5868899Linux arm 64位jdk-8u171-linux-arm648899Linux arm 32位jdk-8u171-linux-arm328899MacOS x64 64位jdk-8u171-macosx-x648899Solarisjdk-8u171-solaris8899Oracle JDK 8u162下载安装平台下载地址密码Windows x64 64位jre-8u162-windows-x648899Windows x86 32位*jre-8u162-windows-i5868899Linux x64 64位jre-8u162-linux-x648899Linux x86 32位jre-8u162-linux-i5868899Linux arm 64位jdk-8u162-linux-arm648899Linux arm 32位jdk-8u162-linux-arm328899MacOS x64 64位jre-8u162-macosx-x648899Solarisjdk-8u162-solaris8899Oracle JDK 8u161下载安装平台下载地址密码Windows x64 64位jdk-8u161-windows-x648899Windows x86 32位jdk-8u161-windows-i5868899Linux x64 64位jdk-8u161-linux-x648899Linux x86 32位jdk-8u161-linux-i5868899Linux arm 64位jdk-8u161-linux-arm648899Linux arm 32位jdk-8u161-linux-arm328899MacOS x64 64位jdk-8u161-macosx-x648899Solarisjdk-8u161-solaris8899Oracle JDK 8u152下载安装平台下载地址密码Windows x64 64位jdk-8u152-windows-x648899Windows x86 32位jdk-8u152-windows-i5868899Linux x64 64位jdk-8u152-linux-x648899Linux x86 32位jdk-8u152-linux-x648899Linux arm 64位jdk-8u152-linux-arm648899Linux arm 32位jdk-8u152-linux-arm328899MacOS x64 64位jdk-8u152-macosx-x648899Solaris*jdk-8u152-solaris8899Oracle JDK 8u151下载安装平台下载地址密码Windows x64 64位jdk-8u151-windows-x648899Windows x86 32位jdk-8u151-windows-i5868899Linux x64 64位jdk-8u151-linux-x648899Linux x86 32位jdk-8u151-linux-i5868899Linux arm 64位jdk-8u151-linux-arm648899Linux arm 32位jdk-8u151-linux-arm328899MacOS x64 64位jdk-8u151-macosx-x648899Solaris*jdk-8u151-solaris8899Oracle JDK 8u144下载安装平台下载地址密码Windows x64 64位jdk-8u144-windows-x648899Windows x86 32位jdk-8u144-windows-i5868899Linux x64 64位jdk-8u144-linux-x648899Linux x86 32位jdk-8u144-linux-i5868899Linux arm 64位jdk-8u144-linux-arm648899Linux arm 32位jdk-8u144-linux-arm328899MacOS x64 64位jdk-8u144-macosx-x648899Solarisjdk-8u144-solaris8899Oracle JDK 8u141下载安装平台下载地址密码Windows x64 64位jdk-8u141-windows-x648899Windows x86 32位jdk-8u141-windows-i5868899Linux x64 64位jdk-8u141-linux-x648899Linux x86 32位jdk-8u141-linux-i5868899Linux arm 64位jdk-8u141-linux-arm648899Linux arm 32位jdk-8u141-linux-arm328899MacOS x64 64位jdk-8u141-macosx-x648899Solarisjdk-8u141-solaris8899Oracle JDK 8u131下载安装平台下载地址密码Windows x64 64位jdk-8u131-windows-x648899Windows x86 32位jdk-8u131-windows-i5868899Linux x64 64位jdk-8u131-linux-x648899Linux x86 32位jdk-8u131-linux-i5868899Linux arm 64位jdk-8u131-linux-arm648899Linux arm 32位jdk-8u131-linux-arm328899MacOS x64 64位jdk-8u131-macosx-x648899Solarisjdk-8u131-solaris8899Oracle JDK 8u121下载安装平台下载地址密码Windows x64 64位jdk-8u121-windows-x648899Windows x86 32位jdk-8u121-windows-i5868899Linux x64 64位jdk-8u121-linux-x648899Linux x86 32位jdk-8u121-linux-i5868899Linux arm 64位jdk-8u121-linux-arm648899Linux arm 32位jdk-8u121-linux-arm328899MacOS x64 64位jdk-8u121-macosx-x648899Solarisjdk-8u121-solaris8899Oracle JDK 8u112下载安装平台下载地址密码Windows x64 64位jdk-8u112-windows-x648899Windows x86 32位jdk-8u112-windows-i5868899Linux x64 64位jdk-8u112-linux-x648899Linux x86 32位jdk-8u112-linux-i5868899Linux arm 64位jdk-8u112-linux-arm648899Linux arm 32位jdk-8u112-linux-arm328899MacOS x64 64位jdk-8u112-macosx-x648899Solarisjdk-8u112-solaris8899Oracle JDK 8u111下载安装平台下载地址密码Windows x64 64位jdk-8u111-windows-x648899Windows x86 32位jdk-8u111-windows-i5868899Linux x64 64位jdk-8u111-linux-x648899Linux x86 32位jdk-8u111-linux-i5868899Linux arm 64位jdk-8u111-linux-arm648899Linux arm 32位jdk-8u111-linux-arm328899MacOS x64 64位jdk-8u111-macosx-x648899Solarisjdk-8u111-solaris8899Oracle JDK 8u92下载安装平台下载地址密码Windows x64 64位jdk-8u92-windows-x648899Windows x86 32位jdk-8u92-windows-i5868899Linux x64 64位jdk-8u92-linux-x648899Linux x86 32位jdk-8u92-linux-i5868899Linux arm 64位jdk-8u92-linux-arm648899Linux arm 32位jdk-8u92-linux-arm328899MacOS x64 64位jdk-8u92-macosx-x648899Solarisjdk-8u92-solaris8899Oracle JDK 8u91下载安装平台下载地址密码Windows x64 64位jdk-8u91-windows-x648899Windows x86 32位jdk-8u91-windows-i5868899Linux x64 64位jdk-8u91-linux-x648899Linux x86 32位jdk-8u91-linux-i5868899Linux arm 64位jdk-8u91-linux-arm648899Linux arm 32位jdk-8u91-linux-arm328899MacOS x64 64位jdk-8u91-macosx-x648899Solarisjdk-8u91-solaris8899Oracle JDK 8u77下载安装平台下载地址密码Windows x64 64位jdk-8u77-windows-x648899Windows x86 32位jdk-8u77-windows-i5868899Linux x64 64位jdk-8u77-linux-x648899Linux x86 32位jdk-8u77-linux-i5868899Linux arm 64位jdk-8u77-linux-arm648899Linux arm 32位jdk-8u77-linux-arm328899MacOS x64 64位jdk-8u77-macosx-x648899Solarisjdk-8u77-solaris8899Oracle JDK 8u74下载安装平台下载地址密码Windows x64 64位jdk-8u74-windows-x648899Windows x86 32位jdk-8u74-windows-i5868899Linux x64 64位jdk-8u74-linux-x648899Linux x86 32位jdk-8u74-linux-i5868899MacOS x64 64位jdk-8u74-macosx-x648899Solarisjdk-8u74-solaris8899Oracle JDK 8u73下载安装平台下载地址密码Windows x64 64位jdk-8u73-windows-x648899Windows x86 32位jdk-8u73-windows-i5868899Linux x64 64位jdk-8u73-linux-x648899Linux x86 32位jdk-8u73-linux-i5868899Linux arm 64位jdk-8u73-linux-arm648899Linux arm 32位jdk-8u73-linux-arm328899MacOS x64 64位jdk-8u73-macosx-x648899Solarisjdk-8u73-solaris8899Oracle JDK 8u72下载安装平台下载地址密码Windows x64 64位jdk-8u72-windows-x648899Windows x86 32位jdk-8u72-windows-i5868899Linux x64 64位jdk-8u72-linux-x648899Linux x86 32位jdk-8u72-linux-i5868899MacOS x64 64位jdk-8u72-macosx-x648899Solarisjdk-8u72-solaris8899Oracle JDK 8u71下载安装平台下载地址密码Windows x64 64位jdk-8u71-windows-x648899Windows x86 32位jdk-8u71-windows-i5868899Linux x64 64位jdk-8u71-linux-x648899Linux x86 32位jdk-8u71-linux-i5868899Linux arm 64位jdk-8u71-linux-arm648899Linux arm 32位jdk-8u71-linux-arm328899MacOS x64 64位jdk-8u71-macosx-x648899Solarisjdk-8u71-solaris8899Oracle JDK 8u66下载安装平台下载地址密码Windows x64 64位jdk-8u66-windows-x648899Windows x86 32位jdk-8u66-windows-i5868899Linux x64 64位*jdk-8u66-linux-x648899Linux x86 32位jdk-8u66-linux-i5868899MacOS x64 64位jdk-8u66-macosx-x648899Solarisjdk-8u66-solaris8899Oracle JDK 8u65下载安装平台下载地址密码Windows x64 64位jdk-8u65-windows-x648899Windows x86 32位jdk-8u65-windows-i5868899Linux x64 64位jdk-8u65-linux-x648899Linux x86 32位jdk-8u65-linux-i5868899MacOS x64 64位jdk-8u65-macosx-x648899Solarisjdk-8u65-solaris8899Oracle JDK 8u60下载安装平台下载地址密码Windows x64 64位jdk-8u60-windows-x648899Windows x86 32位jdk-8u60-windows-i5868899Linux x64 64位jdk-8u60-linux-x648899Linux x86 32位jdk-8u60-linux-i5868899MacOS x64 64位jdk-8u60-macosx-x648899Solarisjdk-8u60-solaris8899Oracle JDK 8u51下载安装平台下载地址密码Windows x64 64位jdk-8u51-windows-x648899Windows x86 32位jdk-8u51-windows-i5868899Linux x64 64位jdk-8u51-linux-x648899Linux x86 32位jdk-8u51-linux-i5868899MacOS x64 64位jdk-8u51-macosx-x648899Solarisjdk-8u51-solaris8899Oracle JDK 8u45下载安装平台下载地址密码Windows x64 64位jdk-8u45-windows-x648899Windows x86 32位jdk-8u45-windows-i5868899Linux x64 64位jdk-8u45-linux-x648899Linux x86 32位jdk-8u45-linux-i5868899MacOS x64 64位jdk-8u45-macosx-x648899Solarisjdk-8u45-solaris8899Oracle JDK 8u40下载安装平台下载地址密码Windows x64 64位jdk-8u40-windows-x648899Windows x86 32位jdk-8u40-windows-i5868899Linux x64 64位jdk-8u40-linux-x648899Linux x86 32位jdk-8u40-linux-i5868899MacOS x64 64位jdk-8u40-macosx-x648899Solarisjdk-8u40-solaris8899Oracle JDK 8u31下载安装平台下载地址密码Windows x64 64位jdk-8u31-windows-x648899Windows x86 32位jdk-8u31-windows-i5868899Linux x64 64位jdk-8u31-linux-x648899Linux x86 32位jdk-8u31-linux-i5868899MacOS x64 64位jdk-8u31-macosx-x648899Solarisjdk-8u31-solaris8899Oracle JDK 8u25下载安装平台下载地址密码Windows x64 64位jdk-8u25-windows-x648899Windows x86 32位jdk-8u25-windows-i5868899Linux x64 64位jdk-8u25-linux-x648899Linux x86 32位jdk-8u25-linux-i5868899MacOS x64 64位jdk-8u25-macosx-x648899Solarisjdk-8u25-solaris8899Oracle JDK 8u20下载安装平台下载地址密码Windows x64 64位jdk-8u20-windows-x648899Windows x86 32位jdk-8u20-windows-i5868899Linux x64 64位jdk-8u20-linux-x648899Linux x86 32位jdk-8u20-linux-i5868899MacOS x64 64位jdk-8u20-macosx-x648899Solarisjdk-8u20-solaris8899Oracle JDK 8u11下载安装平台下载地址密码Windows x64 64位jdk-8u11-windows-x648899Windows x86 32位jdk-8u11-windows-i5868899Linux x64 64位jdk-8u11-linux-x648899Linux x86 32位jdk-8u11-linux-i5868899MacOS x64 64位jdk-8u11-macosx-x648899Solarisjdk-8u11-solaris8899Oracle JDK 8u5下载安装平台下载地址密码Windows x64 64位jdk-8u5-windows-x648899Windows x86 32位jdk-8u5-windows-i5868899Linux x64 64位jdk-8u5-linux-x648899Linux x86 32位jdk-8u5-linux-i5868899MacOS x64 64位jdk-8u5-macosx-x648899Solarisjdk-8u5-solaris8899Oracle JDK 8下载安装平台下载地址密码Windows x64 64位jdk-8-windows-x648899Windows x86 32位jdk-8-windows-i5868899Linux x64 64位jdk-8-linux-x648899Linux x86 32位jdk-8-linux-i5868899MacOS x64 64位jdk-8-macosx-x648899Solarisjdk-8-solaris8899
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java8函数式接口注解FunctionalInterface 函数式接口就是为Java 8的Lambda表达式准备的，Java 8允许使用Lambda表达式创建函数式接口的实例，因此Java 8 专门增加了@FunctionalInterface。什么是函数式接口我们提到如果接口中只有一个抽象方法（可以包含多个默认方法或多个 static 方法），那么该接口就是函数式接口。FunctionalInterface作用@FunctionalInterface就是用来指定某个接口必须是函数式接口，所以@FunInterface只能修饰接口，不能修饰其它程序元素。看下一下面的方法@FunctionalInterface public interface BufferedReaderProcessor { /** * 静态方法 */ static void process() { System.out.println("process"); } /** * 抽象方法 * * @param bufferedReader * @return * @throws IOException */ String process(BufferedReader bufferedReader) throws IOException; /** * 默认方法 * * @param bufferedReader * @return * @throws IOException */ default String process1(BufferedReader bufferedReader) throws IOException { return ""; } }此时IDE是没有任何错误的（当然代码没有错误）截止到此时，我们出程序中的@FunctionalInterface一丢丢的作用，其实@FunctionalInterface注解的作用只是告诉IDE检查这个接口，保证该接口只能包含一个抽象方法，否则就会编译出错。如何理解一个抽象方法的含义。是否能只不包含抽象方法？我们继续修改刚才的代码，注释掉唯一的一个抽象方法 @FunctionalInterface public interface BufferedReaderProcessor { /** * 静态方法 */ static void process() { System.out.println("process"); } // /** // * 抽象方法 // * // * @param bufferedReader // * @return // * @throws IOException // */ // String process(BufferedReader bufferedReader) throws IOException; /** * 默认方法 * * @param bufferedReader * @return * @throws IOException */ default String process1(BufferedReader bufferedReader) throws IOException { return ""; } }此时，IDE给了错误提示了：No target method found（没有找到目标方法），也就是说，一旦使用@FunctionalInterface注解接口，我们必须要提供一个抽象方法。是否能提供多个抽象方法？刚刚我们看到了，一旦接口@FunctionalInterface，我们接口必须包含抽象方法，那么是否能包含多个抽象方法呢，我们看下面代码。@FunctionalInterface public interface BufferedReaderProcessor { /** * 静态方法 */ static void process() { System.out.println("process"); } /** * 抽象方法 * * @param bufferedReader * @return * @throws IOException */ String process(BufferedReader bufferedReader) throws IOException; /** * 抽象方法 * * @return */ String process1(); /** * 默认方法 * * @param bufferedReader * @return * @throws IOException */ default String process1(BufferedReader bufferedReader) throws IOException { return ""; } }此时ide提示Multiple non-overriding abstract methods found in XXX（找到多个非重载的抽象方法），也就是说，一个接口一旦注解了@FunctionalInterface就只能有一个抽象方法。
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