java的double的大数值时 如何才能不显示成科学计数法

Double d = new Double("1234567890.12"); 
System.out.println("d:="+d); 
java.text.NumberFormat nf = java.text.NumberFormat.getInstance(); 
nf.setGroupingUsed(false); 
System.out.println("d:="+nf.format(d)); 

显示结果是:
d:=1.23456789012E9
d:=1234567890.12