BigDecimal的使用（初始化，赋值，比大小）

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BigDecimal b2 = new BigDecimal("0");
BigDecimal b2 = BigDecimal.ZERO;

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BigDecimal b2 = new BigDecimal("100");

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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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BigDecimal b1 = new BigDecimal(v1);
BigDecimal b2 = new BigDecimal(v2);
b1.add(b2);

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 BigDecimal b1 = new BigDecimal(v1);
 BigDecimal b2 = new BigDecimal(v2);
 b1.subtract(b2);

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 BigDecimal b1 = new BigDecimal(v1);
 BigDecimal b2 = new BigDecimal(v2);
 b1.subtract(b2);

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BigDecimal b1 = new BigDecimal(v1);
BigDecimal b2 = new BigDecimal(v2);
divide(b2,scale,BigDecimal.ROUND_HALF_UP);

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 BigDecimal s = ArithUtil.div(“20”,"100",2);