ما هو NumberFormatException في جافا؟
مثال
دعونا نلقي نظرة على مثال بسيط لفهم هذا.import java.util.Date;
public class NumberFormatExceptionTestDriver {
public static void main(String[] args) {
try {
// a valid Integer number in the input String
String inputString = "2550";
System.out.println("Integer.pareseInt(" + inputString + ") = " + Integer.parseInt(inputString));
} catch (NumberFormatException e) {
// java.lang.NumberFormatException will be thrown if the
// input string can not be converted to a valid integer
System.out.println("\nNumberFormatException thrown! " + e.getMessage());
}
try {
// a floating number in the input String
// use Float.parseFloat(inputString) to avoid this exception
String inputString = "255.0";
System.out.println("Integer.pareseInt(" + inputString + ") = " + Integer.parseInt(inputString));
} catch (NumberFormatException e) {
System.out.println("\nNumberFormatException thrown! " + e.getMessage());
}
try {
Date day = new Date();
// date containing alpha-numeric data in the input string
String inputString = day.toString();
System.out.println("Integer.pareseInt(" + inputString + ") = " + Integer.parseInt(inputString));
} catch (NumberFormatException e) {
System.out.println("\nNumberFormatException thrown! " + e.getMessage());
}
try {
// numbers with spaces in the input string
String inputString = "1 2 3";
System.out.println("Integer.pareseInt(" + inputString + ") = " + Integer.parseInt(inputString));
} catch (NumberFormatException e) {
System.out.println("\nNumberFormatException thrown! " + e.getMessage());
}
try {
// all letters in the input string
String inputString = "Lubaina Khan";
System.out.println("Integer.pareseInt(" + inputString + ") = " + Integer.parseInt(inputString));
} catch (NumberFormatException e) {
System.out.println("\nNumberFormatException thrown! " + e.getMessage());
}
}
}
انتاج |
Integer.pareseInt(2550) = 2550 تم طرح NumberFormatException! بالنسبة لسلسلة الإدخال: تم طرح NumberFormatException "255.0"! بالنسبة لسلسلة الإدخال: "الأربعاء 11 أغسطس 08:18:21 PKT 2021" تم طرح NumberFormatException! بالنسبة لسلسلة الإدخال: تم طرح NumberFormatException "1 2 3"! لسلسلة الإدخال: "لوبينا خان"
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