Java7 Double.toString() returns 0.005 / java6 it is 0.0050

Question

I am upgrading from JDK6 to JDK7. The following code demonstrate shows a minor change in Double.toString()

public class StringDemo
{

    pu         


        

Answer 1

This was a bug in Java 1.3 through 1.6 (resolved in 1.7).

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4511638 The bug report http://bugs.sun.com/view_bug.do?bug_id=4428022 contains more details. Fixed in JDK 7 (b75).

Related Reports- Quoted from the link above.

• Backport: JDK-2181423 - System.out.println(0.001) outputs 0.0010
• Duplicate: JDK-5078240 - Double.toString(double) adds a trailing zero in certain cases
• Duplicate: JDK-6575880 - Float.toString(float) adds trailing zeros
• Relates: JDK-6935102 - Regtest
  closed/sun/misc/FloatingDecimal/ToString.java now failing.
• Relates: JDK-4154042 - java.lang.FloatingDecimal could be eliminated

The changes for OpenJDK 7 to fix this issue are available at: http://hg.openjdk.java.net/jdk7/tl/jdk/rev/f85aa3aedf41