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1. function1()
  ·µ»ØÏàͬ闊¶È數×ÖÐÍ×Ö´®. Àý:
  function1(“000000”) => “000001”
  function1(”0023")  => “0024”
  function1(“0009”)  => “0010”
  function1(“000099”) => “000100”
  function1(“9”) => “0” //號碼Ñ­環ÔÙÓÃ
  ³Ìʽ½Ó¿Ú:
  public static String function1(String num){....}
2. function2()
  將數×ÖËÄ捨ÎåÈëÖÁijС數λ, 並·µ»ØÖ¸¶¨Î»數×Ö´®
  function2(123.455,2) => 123.46
  function2(123.449,2) => 123.45
  function2(123.44,3) => 123.440 
  function2(123.4455,3) => 123.446
  function2(123.4499,3) => 123.450
  function2(123.9,0) => 124
  ³Ìʽ½Ó¿Ú:
  public static double function2(double value,int decimalPlaces){....}
-------------------------------------------------------------------------------------
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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.RoundingMode;
import java.text.NumberFormat;
public class test {
 public String function1(String str){
  String rstr="";
  int snum = Integer.parseInt(str);
  int len =str.length();
  snum++;
  rstr =String.format("%0"+len+"d",(int)(snum % Math.pow(10,len)));
  return rstr;
 }
 public double function2(double value, int decimalPlaces) {
     NumberFormat nf = NumberFormat.getNumberInstance();
     nf.setRoundingMode(RoundingMode.HALF_UP); // ËÄÉáÎåÈë
     nf.setMax


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