java的BigDecimal比較大小
//前提為a、b均不能為null if(a.compareTo(b) == -1){ System.out.println("a小於b"); } if(a.compareTo(b) == 0){ System.out.println("a等於b"); } if(a.compareTo(b) == 1){ System.out.println("a大於b"); } if(a.compareTo(b) > -1){ System.out.println("a大於等於b"); } if(a.compareTo(b) < 1){ System.out.println("a小於等於b"); }