BigDecimal 합계 구하기(List, HashMap, Stream 사용)

import java.io.InputStreamReader;
import java.math.BigDecimal;
//import java.math.MathContext;   
//import java.math.RoundingMode;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

class Main {
    public static void main(String args[]) {

        List<Map<String, Object>> payInfoList = new ArrayList<>();
        List<BigDecimal> tempSumOrgPay = new ArrayList<>();
        BigDecimal sumOrgPay = BigDecimal.ZERO;
        
        Map<String, Object> payInfo1 = new HashMap<>();
        payInfo1.put("payAgent","ORG");
        payInfo1.put("paySeq",0);
        payInfo1.put("payDate","20200820");
        payInfo1.put("payAmt","3933963630.0000");
        
        Map<String, Object> payInfo2 = new HashMap<>();
        payInfo2.put("payAgent","ORG");
        payInfo2.put("paySeq",1);
        payInfo2.put("payDate","20200820");
        payInfo2.put("payAmt","4933763630.0000");
        
        payInfoList.add(payInfo1);
        payInfoList.add(payInfo2);
        
        for (Map<String, Object> item : payInfoList) {
            BigDecimal payAmt = new BigDecimal(item.get("payAmt").toString());
            tempSumOrgPay.add(payAmt);
        }
        
        sumOrgPay = tempSumOrgPay.stream().reduce(BigDecimal.ZERO, BigDecimal::add);
        
        System.out.print(sumOrgPay.toString());
    }
}

demo : repl.it/talk/share/BigDecimal-Sum-Code-Example/84679