java简单编程字符串处理

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[]arrStrarg.split(,);for(Stringitem:arrStr){if(result.contains(item)false){resultresultitem.toUpperCase();;}}returnresult;}publicstaticvoidmain(String[]args){HelloWorldhelloObjnewHelloWorld();System.out.println(helloObj.test(java, python, go ,javascript, java));}}