Decimal comparison size

Use bigDecimal's compareTo method to
convert double or float values ​​to bigDecimal values

double num1 = 12.12;
double num2 = 12.11;
BigDecimal a= new BigDecimal(String.valueOf(num1));
BigDecimal b= new BigDecimal(String.valueOf(num2));

//前提为a、b均不能为null
if(a.compareTo(b) == -1){
    System.out.println("a小于b");
}
 
if(a.compareTo(b) == 0){
    System.out.println("a等于b");
}
 
if(a.compareTo(b) == 1){
    System.out.println("a大于b");
}
 
if(a.compareTo(b) > -1){
    System.out.println("a大于等于b");
}
 
if(a.compareTo(b) < 1){
    System.out.println("a小于等于b");
}