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Code to demonstrate Java enhancements

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两次数据变更间,如果没有sleep结算结果,两次是一样的。反应式编程没有怎么接触。不知道这里需要怎么处理

Island.java演示了文本块居中方法, TableIsland.java演示了将前导空格换成table。

老师为啥我这两个输出是false?

1. idea提示17不支持这个特性 2. src下的文件在idea里面无法编译 ![CleanShot 2023-08-23 at 14 57 49@2x](https://github.com/XueleiFan/java-up/assets/28422371/aeb965aa-a5d1-4173-ae49-7b58d961fcb4) 3. 使用maven clean报错 ``` /Library/Java/JavaVirtualMachines/graalvm-jdk-17.0.8+9.1/Contents/Home/bin/java -Dmaven.multiModuleProjectDirectory=/Users/will/develop/myworkspaceAll/java/daily_practice/java-up -Djansi.passthrough=true -Dmaven.home=/Users/will/develop/maven/apache-maven-3.8.6 -Dclassworlds.conf=/Users/will/develop/maven/apache-maven-3.8.6/bin/m2.conf -Dmaven.ext.class.path=/Users/will/Applications/IntelliJ IDEA Ultimate.app/Contents/plugins/maven/lib/maven-event-listener.jar -javaagent:/Users/will/Applications/IntelliJ IDEA Ultimate.app/Contents/lib/idea_rt.jar=65525:/Users/will/Applications/IntelliJ IDEA Ultimate.app/Contents/bin -Dfile.encoding=UTF-8 -classpath /Users/will/develop/maven/apache-maven-3.8.6/boot/plexus-classworlds.license:/Users/will/develop/maven/apache-maven-3.8.6/boot/plexus-classworlds-2.6.0.jar...