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Java Tutorial : Java Exception handling (Unreachable catch block) |
Java Tutorial : Java Exception handling (Unreachable catch block) |
Java Tutorial : Java Exception handling (Unreachable catch block) |
public class ExceptionDemo1 { public static void main(String[] args) { String firstName = null; try { // It will throw NullPointerException System.out.println(firstName.length()); } catch (NullPointerException nullPointerException) { System.out.println("String value is null."); } catch (Exception exception) { exception.printStackTrace(); } String lastName = "Peter"; String fullName = firstName + lastName; System.out.println("fullName = " + fullName); } }
String value is null. fullName = nullPeter
public class ExceptionDemo2 { public static void main(String[] args) { String firstName = null; try { // It will throw NullPointerException System.out.println(firstName.length()); } catch (Exception exception) { exception.printStackTrace(); } String lastName = "Peter"; String fullName = firstName + lastName; System.out.println("fullName = " + fullName); } }
java.lang.NullPointerException at ExceptionDemo2.main(ExceptionDemo2.java:10) fullName = nullPeter
public class ExceptionDemo3 { public static void main(String[] args) { String firstName = null; try { // It will throw NullPointerException System.out.println(firstName.length()); } catch (Exception exception) { exception.printStackTrace(); } catch (NullPointerException nullPointerException) { System.out.println("String value is null."); } String lastName = "Peter"; String fullName = firstName + lastName; System.out.println("fullName = " + fullName); } }
Exception in thread "main" java.lang.Error: Unresolved compilation problem: Unreachable catch block for NullPointerException. It is already handled by the catch block for Exception at ExceptionDemo3.main(ExceptionDemo3.java:19)
https://sites.google.com/site/javaee4321/java/ExceptionDemo_Unreachable_catch_App.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/ExceptionDemo_Unreachable_catch_App
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/a4490537e1a166e28ac44e3caed727d335adc51d/BasicJava/ExceptionDemo_Unreachable_catch_App/?at=master
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