我想编写一个将CamelCase转换为人类可读名称的方法。 这与this question非常相似,但现在使用下划线。
以下是测试用例:
public void testSplitUnderscore() {
assertEquals("lowercase", splitUnderscore("lowercase"));
assertEquals("Class", splitUnderscore("Class"));
assertEquals("My Class", splitUnderscore("My_Class"));
assertEquals("HTML", splitUnderscore("HTML"));
assertEquals("PDF Loader", splitUnderscore("PDF_Loader"));
assertEquals("A String", splitUnderscore("A_String"));
assertEquals("Simple XML Parser", splitUnderscore("Simple_XML_Parser"));
assertEquals("GL 11 Version", splitUnderscore("GL_11_Version"));
assertEquals("99 Bottles", splitUnderscore("99_Bottle"));
assertEquals("May 5", splitUnderscore("May_5"));
assertEquals("BFG 9000", splitUnderscore("BFG_9000"));
assertEquals("beginning", splitUnderscore("_beginning"));
assertEquals("end", splitUnderscore("end_"));
assertEquals("double middle", splitUnderscore("double__middle"));
assertEquals("double end", splitUnderscore("double_end__"));
assertEquals("double start", splitUnderscore("__double_start"));
assertEquals("double start middle end", splitUnderscore("__double_start__middle_end__"));
}
答案 0 :(得分:4)
实现这一目标的一种天真的方法是用'_'
替换每个' '
,然后从最终字符串中删除空格:
public static String splitUnderscore(String s) {
return s.replace("_", " ").trim();
}
虽然以上适用于大多数情况,但为了处理多个相邻的下划线,我们可以使用正则表达式用单个' '
替换任意数量的连续下划线:
public static String splitUnderscore(String s) {
return s.replaceAll("_{1,}", " ").trim();
}
答案 1 :(得分:2)
以下内容应该有效:
String.replace('_', " ").trim();
答案 2 :(得分:1)
您应该有更多测试用例:
assertEquals("A String", splitUnderscore("double__middle"));
assertEquals("A String", splitUnderscore("double_end__"));
assertEquals("A String", splitUnderscore("__double_start"));
assertEquals("A String", splitUnderscore("__double_start__middle_end__"));