java的BigDecimal比较大小

//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");
}

 

?

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public class Test{    public static void main(String args[]){       Integer x = 5;       System.out.println(x.compareTo(3));       System.out.println(x.compareTo(5));       System.out.println(x.compareTo(8));                 } }1 0 -1