java 使用 DecimalFormat 保留小数

java.text.DecimalFormat df = new java.text.DecimalFormat("0.00");

java.text.DecimalFormat df2 = new java.text.DecimalFormat("0.0000");

public String convertDoubleToDouble(java.text.DecimalFormat df,Double s){
String result = "";
if(s==null){
result = " ";
}else{
result = df.format(s*100);
}
return result;
}

public String convertLongToDouble(java.text.DecimalFormat df,Long s){
String result = "";
if(s==null){
result = " ";
}else{
result = df.format((double)s/10000);
}
return result;
}

public String convertDoubleToDouble2(java.text.DecimalFormat df,Double s){
String result = "";
if(s==null){
result = " ";
}else{
result = df.format((double)s/10000);
}
return result;
}