java - 如何将字符串值转换为int值？

Question

如果日期是字符串而不是数字，我的代码不会显示日期。如果我用 2,3,4 之类的数字替换该值，它可以正常工作，否则代码会抛出错误，如 logcat 所示:

java.util.IllegalFormatConversionException: d is incompatible with java.lang.String

这是代码:

String completedate;
String value;
mYear = mCalendar.get(Calendar.YEAR);
mMonth = mCalendar.get(Calendar.MONTH) + 1;

case R.id.e02:

    value = e02.getText().toString();

    completedate = 
        String.format("%02d", value)
        + String.format("%02d", mMonth)
        + mYear;

下面是我的 logcat 错误

 08-15 11:45:11.301: E/AndroidRuntime(1493): FATAL EXCEPTION: main
 08-15 11:45:11.301: E/AndroidRuntime(1493):    
 java.util.IllegalFormatConversionException: d is incompatible with java.lang.String
 08-15 11:45:11.301: E/AndroidRuntime(1493):    at  
 java.util.Formatter$Transformer.badArgumentType(Formatter.java:1452)
 08-15 11:45:11.301: E/AndroidRuntime(1493):    at  
 java.util.Formatter$Transformer.transformFromInteger(Formatter.java:1683)
 08-15 11:45:11.301: E/AndroidRuntime(1493):    at 
 java.util.Formatter$Transformer.transform(Formatter.java:1410)
 ...

Answer 1

按此转换:

int value =Integer.parseInt(string);

如果字符串为空，则检查:

if(string.length()>0 || !string.isEmpty()){

  int value =Integer.parseInt(string);

} else{
 // string is Null......
}