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发生缘由学习Flutter更改lib目录下面的main.dart文件之后真机调试运行flutterrun报错：1#小组件库异常2══╡EXCEPTIONCAUGHTBYWIDGETSLIBRARY╞═══════════════════════════════════════════════════
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packagecom.chen.method;publicclassDemo02{publicstaticvoidmain(String[]args){doublesum=sum(1.0,1.0);System.out.println(sum);}//比大小publicstaticdoublesum(doublea,doubleb){doubleresult=0;
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packageoperator;publicclassDemo02{publicstaticvoidmain(String[]args){longa=158975155916185L;intb=123;shortc=10;byted=8;System.out.println(a+b+c+d);//longSystem.out.println(b+c+d);/
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packagecom.chao.base;publicclassDemo02{publicstaticvoidmain(String[]args){//整数拓展：进制二进制0b十进制八进制0十六进制0xinti=10;inti1=010;//八进制0inti2=0x10;//十六进制0x0~9A~F16System
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<!DOCTYPEhtml><html><body><?phpecho"<h2>PHPisfun!</h2>";echo"helloworld"; echo"I'mabouttolearnPHP!<br>";echo"This","string","was&qu