[Java] [Apache Freemarker] How to compute total price in ftl ?

How-To
You can assign a variable, added value in the loop, then print the value in the end.

<#assign total = 0>
${"水果名稱"?right_pad(10)}${"單價"?right_pad(5)}${"訂購數量"?right_pad(10)}
${"-"?right_pad(25, "-")}
<#list rows as row>
<#assign total += row.price * row.quantity>
${row.name?right_pad(10)}${row.price?left_pad(5)}${row.quantity?left_pad(10)}
</#list>
${"-"?right_pad(25, "-")}
總筆數：${rows?size?left_pad(10)}
總金額：${total?left_pad(10)}

Result

水果名稱      單價   訂購數量      
-------------------------
apple        50        20
avocado      60         2
banana       70         1
cherry       80        10
coconut      90         1
durian      100         3
-------------------------
總筆數：         6
總金額：     2,380