1.BigDecimalの比較サイズ
BigDecimal big1 = new BigDecimal(4.42524233436);
BigDecimal big2 = new BigDecimal(-2.12435255542);
BigDecimal big3 = new BigDecimal(0);
// -1小于,0相等,1大于
int result = big1.compareTo(big2);
System.out.println(result);// 1
//与0比较 特殊 -1小于,0相等,1大于
if (big1.compareTo(BigDecimal.ZERO) == 1) {
System.out.println("大于0");
}
if (big2.compareTo(BigDecimal.ZERO) == -1) {
System.out.println("小于0");
}
if (big3.compareTo(BigDecimal.ZERO) == 0) {
System.out.println("等于0");
}`