wofead / JavaStudy

用Java实现各种数据结构

JavaStudy

用Java实现各种数据结构

字符串的连接

在同步的情况下 StringBuilder好于“+”、contact、StringBuffer和StringUtils.join 在异步的情况下使用StringBuffer 因为它是线程安全的

    String a = "dfda"
    String b = "ddsaf"
    String hello = a + b
    String helloC = a.contact(b)
    StringBuffer stringBuffer = new StringBuffer("stringBuffer");
    StringBuffer helloBuffer = stringBuffer.append("hello");
    StringBuilder stringBuilder = new StringBuilder("stringBuilder");
    StringBuilder helloBuilder = stringBuilder.append("hello");
    String []str = {"ewqe","fera"};
    String result = StringUtils.join(str,",") //ewqe,fera