Here you can find the source of releaseNull(BigDecimal amount)
public static BigDecimal releaseNull(BigDecimal amount)
//package com.java2s; import java.math.BigDecimal; public class Main { public static BigDecimal releaseNull(BigDecimal amount) { return amount == null ? BigDecimal.ZERO : amount; }//w ww .ja v a2 s . c o m }