为什么bigdecimal(“5.50”)不等于bigdecimal(“5.5”),如何解决这个问题?

public boolean equals(Object x)

BigDecimal Object compareTo

compareTo() == 0

== seems like a bad idea

new BigDecimal ("5.50").setScale(2).equals(new BigDecimal("5.5").setScale (2))

BigDecimal a1 = new BigDecimal("5.051");
BigDecimal b1 = new BigDecimal("5.05");
// wow, this is awkward in Java
int maxScale = Collections.max(new ArrayList() {{ a1.scale(), b1.scale()}});
System.out.println(
  a1.setScale(maxScale).equals(b1.setScale(maxScale)) 
  ? "are equal" 
  : "are different" );

compareTo() == 0

/**
 * Version of compareTo that ignores sign.
 */
private int compareMagnitude(BigDecimal val) {
    // Match scales, avoid unnecessary inflation
    long ys = val.intCompact;
    long xs = this.intCompact;

compareTo

bd1.stripTrailingZeros().equals(bd2.stripTrailingZeros())