比较一个数是否在0-1

public void m4(){
    BigDecimal num = new BigDecimal("0");
    BigDecimal num2 = new BigDecimal("1");
    Double d=2.9;
    if( d.compareTo(Double.valueOf(num.toString())) >= 0 &&d.compareTo(Double.valueOf(num2.toString()))<=0){
        System.out.println("ok");
    }else {
        System.out.println("defult");
    }
}