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