importjava.util.List;// 2. 引入 ArrayList 实现类importjava.util.ArrayList;importjava.lang.reflect.Method;importjava.util.Arrays;// 期望输出JAVA;PYTHON;GO;JAVASCRIPTpublicclassHelloWorld{publicstaticStringtest(Stringarg){Stringresult="";String[]arrStr=arg.split(",");for(Stringitem:arrStr){if(result.contains(item)==false){result=result+item.toUpperCase()+";";}}returnresult;}publicstaticvoidmain(String[]args){HelloWorldhelloObj=newHelloWorld();System.out.println(helloObj.test("java, python, go ,javascript, java"));}}