java字符串转bigdecimal,在java中将字符串转换为BigDecimal

I am reading a currency from XML into Java.

String currency = 135.69;

When I convert this to BigDecimal I get:

System.out.println(new BigDecimal(135.69));

Output:

135.68999999999999772626324556767940521240234375.

Why is it that it outputs this many numbers? How can I avoid this? All I want is for it to output 135.69.

解决方案

The BigDecimal(double) constructor have some problems, is preferrable that you uses BigDecimal(String) or BigDecimal.valueOf(double).

System.out.println(new BigDecimal(135.69)); //135.68999999999999772626324556767940521240234375

System.out.println(new BigDecimal("135.69")); // 135.69

System.out.println(BigDecimal.valueOf(135.69)); // 135.69

The BigDecimal(double) documentation explain about this behavior:

The results of this constructor can be somewhat unpredict