问题
I have some code where I am serializing one of my classes that contains a DecimalFormat number. This worked up until 2.3.4. How can I resolve?
ERROR/AndroidRuntime(684): java.lang.IllegalArgumentException: no char field 'exponential'
Here is the class that I am serializing:
public class Quote implements Serializable {
private static final long serialVersionUID = 1L;
private String symbol;
private String name;
private String change;
private String percentChange;
private String open;
private String daysHigh;
private String daysLow;
private String dividendYield;
private String volume;
private String averageDailyVolume;
private String peRatio;
private String marketCapitalization;
private String yearHigh;
private String yearLow;
private String lastTradePriceOnly;
private DecimalFormat df = new DecimalFormat("#,###,###,###,###,##0.00");
private DecimalFormat vf = new DecimalFormat("#,###,###,###,###,##0");
public String getSymbol() {
return symbol;
}
public void setSymbol(String symbol) {
this.symbol = symbol;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getChange() {
return change;
}
public void setChange(String change) {
if(change.equals("null")){
this.change = "N/A";
}
else{
float floatedChange = Float.valueOf(change);
this.change = (df.format(floatedChange));
}
}
public String getPercentChange() {
return percentChange;
}
public void setPercentChange(String percentChange) {
if(percentChange.equals("null"))
percentChange = "N/A";
else
this.percentChange = percentChange;
}
public String getOpen() {
return open;
}
public void setOpen(String open) {
if(open.equals("null"))
this.open = "N/A";
else
this.open = open;
}
public String getDaysHigh() {
return daysHigh;
}
public void setDaysHigh(String daysHigh) {
if(daysHigh.equals("null"))
this.daysHigh = "N/A";
else{
float floatedDaysHigh = Float.valueOf(daysHigh);
this.daysHigh = (df.format(floatedDaysHigh));
}
}
public String getDaysLow() {
return daysLow;
}
public void setDaysLow(String daysLow) {
if(daysLow.equals("null"))
this.daysLow = "N/A";
else{
float floatedDaysLow = Float.valueOf(daysLow);
this.daysLow = (df.format(floatedDaysLow));
}
}
public String getVolume() {
return volume;
}
public void setVolume(String volume) {
if(volume.equals("null")){
this.volume = "N/A";
}
else{
float floatedVolume = Float.valueOf(volume);
this.volume = (vf.format(floatedVolume));
}
}
public String getDividendYield() {
return dividendYield;
}
public void setDividendYield(String dividendYield) {
if(dividendYield.equals("null"))
this.dividendYield = "N/A";
else
this.dividendYield = dividendYield;
}
public String getAverageDailyVolume() {
return averageDailyVolume;
}
public void setAverageDailyVolume(String averageDailyVolume) {
if(averageDailyVolume.equals("null")){
this.averageDailyVolume = "N/A";
}
else{
float floatedAverageDailyVolume = Float.valueOf(averageDailyVolume);
this.averageDailyVolume = (vf.format(floatedAverageDailyVolume));
}
}
public String getPeRatio() {
return peRatio;
}
public void setPeRatio(String peRatio) {
if(peRatio.equals("null"))
this.peRatio = "N/A";
else
this.peRatio = peRatio;
}
public String getMarketCapitalization() {
return marketCapitalization;
}
public void setMarketCapitalization(String marketCapitalization) {
if(marketCapitalization.equals("null"))
this.marketCapitalization = "N/A";
else
this.marketCapitalization = marketCapitalization;
}
public String getYearHigh() {
return yearHigh;
}
public void setYearHigh(String yearHigh) {
if(yearHigh.equals("null"))
this.yearHigh = "N/A";
else
this.yearHigh = yearHigh;
}
public String getYearLow() {
return yearLow;
}
public void setYearLow(String yearLow) {
if(yearLow.equals("null"))
this.yearLow = "N/A";
else
this.yearLow = yearLow;
}
public String getLastTradePriceOnly() {
return lastTradePriceOnly;
}
public void setLastTradePriceOnly(String lastTradePriceOnly) {
if(lastTradePriceOnly.equals("null")){
this.lastTradePriceOnly = "N/A";
}
else{
float floatedLastTradePriceOnly = Float.valueOf(lastTradePriceOnly);
this.lastTradePriceOnly = (df.format(floatedLastTradePriceOnly));
}
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((change == null) ? 0 : change.hashCode());
result = prime * result
+ ((daysHigh == null) ? 0 : daysHigh.hashCode());
result = prime * result + ((daysLow == null) ? 0 : daysLow.hashCode());
result = prime
* result
+ ((lastTradePriceOnly == null) ? 0 : lastTradePriceOnly
.hashCode());
result = prime
* result
+ ((marketCapitalization == null) ? 0 : marketCapitalization
.hashCode());
result = prime * result + ((name == null) ? 0 : name.hashCode());
result = prime * result + ((open == null) ? 0 : open.hashCode());
result = prime * result + ((peRatio == null) ? 0 : peRatio.hashCode());
result = prime * result
+ ((percentChange == null) ? 0 : percentChange.hashCode());
result = prime * result + ((symbol == null) ? 0 : symbol.hashCode());
result = prime * result + ((volume == null) ? 0 : volume.hashCode());
result = prime * result
+ ((yearHigh == null) ? 0 : yearHigh.hashCode());
result = prime * result + ((yearLow == null) ? 0 : yearLow.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Quote other = (Quote) obj;
if (change == null) {
if (other.change != null)
return false;
} else if (!change.equals(other.change))
return false;
if (daysHigh == null) {
if (other.daysHigh != null)
return false;
} else if (!daysHigh.equals(other.daysHigh))
return false;
if (daysLow == null) {
if (other.daysLow != null)
return false;
} else if (!daysLow.equals(other.daysLow))
return false;
if (lastTradePriceOnly == null) {
if (other.lastTradePriceOnly != null)
return false;
} else if (!lastTradePriceOnly.equals(other.lastTradePriceOnly))
return false;
if (marketCapitalization == null) {
if (other.marketCapitalization != null)
return false;
} else if (!marketCapitalization.equals(other.marketCapitalization))
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
if (open == null) {
if (other.open != null)
return false;
} else if (!open.equals(other.open))
return false;
if (peRatio == null) {
if (other.peRatio != null)
return false;
} else if (!peRatio.equals(other.peRatio))
return false;
if (percentChange == null) {
if (other.percentChange != null)
return false;
} else if (!percentChange.equals(other.percentChange))
return false;
if (symbol == null) {
if (other.symbol != null)
return false;
} else if (!symbol.equals(other.symbol))
return false;
if (volume == null) {
if (other.volume != null)
return false;
} else if (!volume.equals(other.volume))
return false;
if (yearHigh == null) {
if (other.yearHigh != null)
return false;
} else if (!yearHigh.equals(other.yearHigh))
return false;
if (yearLow == null) {
if (other.yearLow != null)
return false;
} else if (!yearLow.equals(other.yearLow))
return false;
return true;
}
}
And here is my serialize operation (note quotes is an array list):
private void serializeQuotes() {
FileOutputStream fos;
try {
fos = openFileOutput(Constants.FILENAME, Context.MODE_PRIVATE);
ObjectOutputStream oos = new ObjectOutputStream(fos);
oos.writeObject(quotes); //this is an ArrayList<Quote>
oos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
回答1:
Why are you serializing a DecimalFormat at all? Replace the instance DecimalFormat fields with static ones. If concurrency is a concern, use static ThreadLocal<DecimalFormat>s.
public class Quote implements Serializable {
private static final long serialVersionUID = 1L;
private String symbol;
private String name;
private String change;
private String percentChange;
private String open;
private String daysHigh;
private String daysLow;
private String dividendYield;
private String volume;
private String averageDailyVolume;
private String peRatio;
private String marketCapitalization;
private String yearHigh;
private String yearLow;
private String lastTradePriceOnly;
private static final ThreadLocal<DecimalFormat> df = new ThreadLocal<DecimalFormat> {
@Override
protected DecimalFormat initialValue() {
return new DecimalFormat("#,###,###,###,###,##0.00");
}
}
private static final ThreadLocal<DecimalFormat> vf = new ThreadLocal<DecimalFormat> {
@Override
protected DecimalFormat initialValue() {
return new DDecimalFormat("#,###,###,###,###,##0");
}
}
// snip...
}
http://download.oracle.com/javase/6/docs/api/java/lang/ThreadLocal.html
来源：https://stackoverflow.com/questions/5917899/problem-serializing-decimalformatsymbols-in-2-3-4