数据库字段转java字段小工具

//示例:数据库字段: company_id --> java字段: companyId 
//主要是有大量的数据库字段时用起来方便
package com.demo.controller;

import java.util.ArrayList;

public class Test2 {
    public static void main(String[] args) {
        
        String databaseField="company_id company_id company_id company_id company_id";
        String javaField = toPropertyName(databaseField);
        System.out.println("生成的java字段:"+javaField);
    }
    private static String toPropertyName(String s) {
        String key = "_";
        System.out.println("传入的数据库字段:"+s);

        ArrayList<Integer> arrayList = new ArrayList<Integer>();

        ArrayList<Integer> arrayList2 = new ArrayList<Integer>();
        int a = s.indexOf(key);//*第一个出现的索引位置
        while (a != -1) {
            arrayList.add(a);
            a = s.indexOf(key, a + 1);//*从这个索引往后开始第一个出现的位置
        }

        for (int i = 0; i < arrayList.size(); i++) {
            arrayList2.add(arrayList.get(i)  + 1);
        }

        StringBuilder sb = new StringBuilder(s);
        for (int i = 0; i < arrayList2.size(); i++) {
            char c = s.charAt(arrayList2.get(i));
            int i1 = (int)c - 32;
            char c1 = (char)i1;
            s.replace("_","");
            sb.replace(arrayList2.get(i), arrayList2.get(i)+1, c1+"");
        }

        return   sb.toString().replace("_", "");
    }
}