Java下划线转驼峰，驼峰转下划线,代码编译测试

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                    import java.text.ParseException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Test  {

    public static void main(String args[]) throws ParseException {
        //下划线转驼峰
        System.out.println(Test.underline2Camel("yxjc123_com", true));
        //驼峰转下划线
        System.out.println(Test.camel2Underline("yxjc123Com"));
    }

    /**
     * 下划线转驼峰
     * @param line
     * @param smallCamel
     * @return
     */
    public static String underline2Camel(String line,boolean smallCamel){
        if(line==null||"".equals(line)){
            return "";
        }
        StringBuffer sb=new StringBuffer();
        Pattern pattern= Pattern.compile("([A-Za-z\\d]+)(_)?");
        Matcher matcher=pattern.matcher(line);
        while(matcher.find()){
            String word=matcher.group();
            sb.append(smallCamel&&matcher.start()==0?Character.toLowerCase(word.charAt(0)):Character.toUpperCase(word.charAt(0)));
            int index=word.lastIndexOf('_');
            if(index>0){
                sb.append(word.substring(1, index).toLowerCase());
            }else{
                sb.append(word.substring(1).toLowerCase());
            }
        }
        return sb.toString();
    }
    /**
     *  驼峰转下划线
     * @param line  The source string
     * @return  The converted string
     */
    public static String camel2Underline(String line){
        Pattern compile = Pattern.compile("[A-Z]");
        Matcher matcher = compile.matcher(line);
        StringBuffer sb = new StringBuffer();
        while(matcher.find()) {
            matcher.appendReplacement(sb,  "_" + matcher.group(0).toLowerCase());
        }
        matcher.appendTail(sb);
        return sb.toString();
    }

}
                

Java下划线转驼峰，驼峰转下划线在线测试，这是一个简单方便的Java在线运行工具，支持在线编译、在线调试和在线结果的实时反馈。