17-字符串工具类

字符串转驼峰

public class CamelCaseConverterUtil {

    // 将字符串转换为小驼峰格式 (lowerCamelCase)
    public static String toLowerCamelCase(String str) {
        StringBuilder result = new StringBuilder();
        String[] parts = str.split("_");
        
        for (int i = 0; i < parts.length; i++) {
            if (i == 0) {
                // 第一个单词首字母小写
                result.append(parts[i].toLowerCase());
            } else {
                // 其他单词首字母大写
                result.append(parts[i].substring(0, 1).toUpperCase());
                result.append(parts[i].substring(1).toLowerCase());
            }
        }
        
        return result.toString();
    }

    // 将字符串转换为大驼峰格式 (UpperCamelCase)
    public static String toUpperCamelCase(String str) {
        StringBuilder result = new StringBuilder();
        String[] parts = str.split("_");
        
        for (String part : parts) {
            // 每个单词首字母大写
            result.append(part.substring(0, 1).toUpperCase());
            result.append(part.substring(1).toLowerCase());
        }
        
        return result.toString();
    }

    public static void main(String[] args) {
        String input = "hello_world_example";
        
        String lowerCamelCase = toLowerCamelCase(input);
        String upperCamelCase = toUpperCamelCase(input);
        
        System.out.println("输入字符串: " + input);
        System.out.println("小驼峰 (lowerCamelCase): " + lowerCamelCase);
        System.out.println("大驼峰 (UpperCamelCase): " + upperCamelCase);
    }
}