Java中如何将一个字符串数组转换为字符串呢?

数组拼接为字符串，我们可以采用以下方法
    String.join方法即可实现相应的需求

    package com.java265.controller;


    import com.java265.service.IAService;
    import org.apache.logging.log4j.util.Strings;
    import org.springframework.context.ApplicationContext;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.Mapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import javax.annotation.Resource;
    import java.util.Arrays;
    import java.util.list;
    
    @Controller
    @RequestMapping("/main")
    public class A {
    
    
        @Resource
        ApplicationContext applicationContext;
    
        @Resource
        IAService iaService;
    
        @GetMapping("/a")
        @ResponseBody
        public String test(){
    
            String[] beanDefinitionNames = applicationContext.getBeanDefinitionNames();
    
    
            return iaService.run()+ "{"+ String.join("<br />",beanDefinitionNames);
        }
    
    }