JAVA获取一个LIST中的最大值

JAVA获取一个LIST中的最大值

方法一：

Voucher max = null;

if (list != null && !list.isEmpty() && list.size() > 0) {

max = list.get(0);

for (Voucher v : list) {

if (Double.parseDouble(v.getAmountCny()) >= Double.parseDouble(max.getAmountCny())) {

max = v;

}

}

}else if(list != null && !list.isEmpty() && list.size() == 0) {

max = list.get(0);

}

   Voucher max = null;
        if (list != null && !list.isEmpty() && list.size() > 0) {
            
            
            max = list.get(0);
            for (Voucher v : list) {
                if (Double.parseDouble(v.getAmountCny()) >=  Double.parseDouble(max.getAmountCny())) {
                    max = v;
                }
            }
        }else if(list != null && !list.isEmpty() && list.size() == 0) {
            max = list.get(0);
            
        }

方法二：使用 Stream API

Voucher max = list.stream().max(Comparator.comparing(Voucher::getAmountCny)).orElse(null); // 如果列表为空，返回null

Voucher max = list.stream().max(Comparator.comparing(Voucher::getAmountCny)).orElse(null);