Java serialization 63- exception handling try ... catch ..., method getMessageyu printStackTrace

First, the treatment of abnormal second method

1.try......catch...

grammar:

 

try{

  The code may appear abnormal;

}catch{

  The code that handles;

}catch{

 

 

note:

(1) the introduction of anything unusual, catch which must be clearly written, there was nothing unusual how to do;

(2) may have abnormal parent and child classes, in this order from the capture; therefore needed when writing abnormality in top-down, from small to large (i.e. from a subclass to superclass exception )

(3) try ,,, catch up to execution .... a catch block, after the execution try ..... catch .... is over.

 

package com.bjpowernode.java_learning;

import java.io. * ;

public class D63_1_TryCatchExercise {

  public static void main(String[] args) {

    try {

      FileInputStream f1 = new FileInputStream("C:\\user");

      f1.read();

    }catch(ArithmeticException a) {

     

    }catch(FileNotFoundException f) {

     

    }

  }

}

 

 

For throws exception processing to occur on the code block abnormality coverage, otherwise an error, for example: the reason is not processed read () method of introducing an IOException.

 

package com.bjpowernode.java_learning;

import java.io. * ;

public class D63_1_TryCatchExercise {

  public static void main(String[] args) throws FileNotFoundException{

      FileInputStream f1 = new FileInputStream("C:\\user");

      f1.read();

   }

}

 

 

Correct way is to change one line of code

 

public static void main(String[] args) throws FileNotFoundException,IOException

 

 

Two, getMessage method and printStackTrace

 

package com.bjpowernode.java_learning;

 

import java.io. * ;

 

public class D63_2_MethodOfgetMessageAndprintStackTrace {

  public static void main(String[] args) {

    try {

      FileInputStream f1 = new FileInputStream("C:\\fjdoa");

    }catch (FileNotFoundException e) {

      // print exception stack information

      // will use this method to debug programs in general

      e.printStackTrace ();

      // The following methods and functions of this method is actually the same as above, but usually use the above method, since the above method can print out more detailed information 

      String msg = e.getMessage ();

      System.out.println(msg);

    }

    System.out.println("ABC");

  }

}

Third, the source code:

D63_1_TryCatchExercise.java

D63_2_MethodOfgetMessageAndprintStackTrace.java

https://github.com/ruigege66/Java/blob/master/D63_1_TryCatchExercise.java

https://github.com/ruigege66/Java/blob/master/D63_2_MethodOfgetMessageAndprintStackTrace.java

2.CSDN：https://blog.csdn.net/weixin_44630050

3. Park blog: https: //www.cnblogs.com/ruigege0000/

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