Optionally Catch Exception If Not Going To Be Caught By Calling Routine?

Apr 10, 2014

I want to write classes with methods that perform JDBC operations that throw SQL exceptions. For many of the methods, I'd ideally like to be able to have them catch exceptions and just send them to a standard Logging system "IF" the code that calls the methods is not going to catch the same exception. However, I'd like the "option" to have code that calls these methods catch the same errors if I want to but not "Require" the calling routines to catch them.... so I don't want to declare the methods with a "throws" that would require all calling code to Try/catch.

For some background, the logic behind what I'm looking to do is that there will be lots of places where these classes and their methods may be used where the code is basically "throw away" scripting code where just having error logs generated is more than sufficient. However there are also places I want to use the same classes/methods that I would want to handle the exception differently. So, for at least half the places I want to use these methods, there's no good reason to require cluttering the calling code with Try/catch, but when I DO want to handle the exceptions, I'd like them to get passed up to the calling routine so I can handle them in a way that is appropriate for the calling routine. Does that make sense?

I guess I'm kind of looking for is the ability to "override" the catch of a called method "IF" I want to but to treat the method as though it doesn't throw any exception "IF" I don't want to override the called routines catch logic.

Is this possible?

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Unreported Exception - Must Be Caught Or Declared To Be Thrown

Oct 4, 2014

I am getting the above error and am not sure which direction to proceed. In the class, the only way we have discussed getting user input is by System.in.read. I have searched and apparently found better methods for getting user input, but wanted to stick with what has been presented thus far.

Assignment Directions:

1. Create a new class named “valuemethod”

2. Create a new method named “Main”

3. In Main Write the code that will call the method EnterPay and YearlySal

4. Create a new method named “EnterPay”

5. In the EnterPay method Write the code that asks the user to input their hourly wage. Use the formula to calculate their yearly salary: wage * 2040. Return the yearly salary to the main method

6. In the main method write the code that will display this: “Your yearly salary is:

Java Code:

package valuemethod;
public class Valuemethod
{
public static void main(String[] args)
//throws java.io.IOException -- moved to EnterPay

[Code] .....

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Feb 3, 2015

class Arg
{
public void rt()throws Exception
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}
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[code]...

the way to handle the exception that has been in the catch block{b.rt()} .

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Jan 29, 2015

I want to catch the exception in my program is the below way:

class Temp
{
public static void main(String s[])
{
try
{
int x=10/s.length;
System.out.println(x);

[Code] ....

I am expecting my program should give output as "java.lang.ArithmeticException: / by zero" but is giving

Temp.java:11: error: ')' expected
catch (ArithmeticException e | ArrayIndexOutOfBoundsException e)
^
Temp.java:11: error: ';' expected
catch (ArithmeticException e | ArrayIndexOutOfBoundsException e)
^
Temp.java:16: error: 'catch' without 'try'
catch (Exception e)
^
Temp.java:22: error: reached end of file while parsing
}
^
4 error

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Jul 16, 2014

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Oct 18, 2014

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public class Rectangle {
double width ;
double height ;
Rectangle(){
width = 1;
height = 1;

[code]....

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Feb 2, 2015

import java.io.*;
class Base
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void get()throws Exception{}
}

class Excep extends Base

[code]....

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public static void main(String []args)
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Oct 26, 2014

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Ex:
}catch (IOException | SQLException ex) {
System.out.println("Exception thrown");
/**
* i want like this, if IOException is thrown then System.out.println("File not Found");
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*/
}

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Mar 11, 2014

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Now the question is Why compiler compels checked exception to be put in try catch clause but doesn't complain anything in case of Runtime Exception???

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Dec 3, 2014

I know that I am not 100% comprehending try/catch blocks, but after scouring message boards, forums, and Oracle, I still can't pick out where I am going wrong.

I have a ValidateInput class where I am trying to check that a String only has letters. If not, then throw an exception message via JOptionPane. I created my own NonLetterException class. When I call the method containing the try/catch Eclipse gives me an Unhandled Exception Type error.

in main()
ValidateInput validate = new ValidateInput();
String name = "error";
for(int x = 0; x < 1;){
name = JOptionPane.showInputDialog("Welcome. What is your name?");
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if(isItName)

[code]....

Aren't I handling it in the try/catch? What did I miss?

Also, I have have tried the NonLetterException class as nested in ValidatedInput, but also not nested. To me nested makes more sense. I have never nested classes before, but it makes sense to me because I am not using this exception in other parts of my program.

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Aug 15, 2014

I have a file greenGrow.txt, and every three lines of the file has a last name, first name, and yard size. Every time a Customer object is created, I need to read the file 3 lines and assign the object a last name, first name, and yard size.

Snippet of my code:

import java.io.*;
import java.util.*;
public class Customer {
private String lastName;
private String firstName;
private int yardSize;

[Code] .....

My issue is that I cannot call readFile() from the constructor, and I'm assuming that's because I throw Exception on readFile(). Is this a simple fix, or am I looking at it the wrong way?

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public class Digit extends Thread {
private int digit;
public void setDigit(int digit) {
this.digit = digit;
}
// run method follows
}

Here is the portion of the main class where I define an array and then call the setter.

Digit[] digits = new Digit[10];
for (int i = 0; i < digits.length; i++) {
digits[i].setDigit(i); // NullPointerException occurs here
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Mar 19, 2015

I'm trying to call the grade.processFile method from the main method but I'm getting this Error below. I'll post my code which includes the main method and the class underneath the error message:

Exception in thread "main" java.lang.NullPointerException
at java.io.FileInputStream.<init>(FileInputStream.jav a:130)
at java.util.Scanner.<init>(Scanner.java:611)
at MyGrades.processFile(MyGrades.java:49)
at myGradesMain.main(myGradesMain.java:19) 
import java.util.Scanner;
import java.io.*;

[code]...

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Jan 15, 2014

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public String getCountyCode(Address inputAddress) throws AddressNormalizationException
{
String retval = null;
try
{
retval = this.normalizeAddress(inputAddress).getCountyCode( );
}
catch(InvalidAddressException e)

[code]...

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try {
...
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.... TODO handle exception
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Nov 7, 2014

public class ThrowException {
public static void main (String[] args) {
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throw "Err1";
} else if (x<0){
throw "Err2";
} else if (isNaN(x)){
throw "Err3";
}
}
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import java.util.*;

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public static void main(String[] args) {
Scanner input = new Scanner(System.in);
boolean continueInput = true;

[code]....

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Apr 13, 2015

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Oct 15, 2014

I'm asking if there is a way to pass parameter between try/catch block.

I have a method:
 
public void invia(OiStorto invioaca) throws Exception {      
         Long id=0L;
        try {
               //some code
     for (VElenpere elenpere : elenperes) {

[Code] ...

The method called in the for:

private void popolaScompiute(Long anno, InviaEOI inviaEOI0, _4IntegerType param, ElOpeIncType opereIncompiute,
            VElencoOpere elencoOpere,Long id) { 
        try {
          //some code
     for (OiOpera opere : oiOpere){
             
[Code] ....
   
And finally the method in which the error can occur (the method poputa is called for every id)
 
private void poputa(ElOpeIncType opereIncompiute, OpeIncType operaSingola, OiOpera opere) {
try {
//some code
} catch (NullPointerException e) {
            e.printStackTrace();
            //return id;
        }
       
So method invia call the method popolaScompiute, inside popolaScompiute there is an iteration through some id and for some id can occur an error; what i want is the getting the value of id in the first method invia, using the block try/catch. Is there a way to accomplish this?

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Feb 18, 2015

Regarding return statements within methods. So I have a method containing try and catch block (as required) and much like when you have an if else statement... I noted you have to return an object for both the try and catch blocks. Now in my case my method should return a List object.

The way I have tried to overcome this:

- I've initialised a List object to null as an attribute of the class I'm working in.
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However the method always seems to return null (when it shouldn't).

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Apr 27, 2014

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Java Code:

import java.io.IOException;
import java.util.Scanner;
public class BinaryToDecimal {
public static void main(String[] args){
Scanner input = new Scanner(System.in);

[Code] .....

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May 5, 2014

So I'm pretty sure this is correct, as it follows most examples I can find online, but I keep getting an error that my return variable cannot be resolved. The error is on the return conn; statement. It says conn cannot be resolved. If I place it above within the try block it allows it but then I receive an error saying the method getDBConnection must return type Connection.

import java.sql.*;
public Connection getDBConnection() {
try {
Class.forName("org.sqlite.JDBC");
String path = "jdbc:sqlite::resource:project.db";

[Code] .....

I don't want to create this method. Basically I want to connect to the database in the main program, but I do want methods that can access the DB too. But however I place it, it doesn't let me touch any of the DB variables outside of the Try block.

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Oct 14, 2014

Any way to pass parameter between try/catch block.

In other word:

I have a method:
 
public void invia(OiStorto invioaca) throws Exception {
         Long id=0L;
        try {
               //some code
     for (VElenpere elenpere : elenperes) {
                popolaScompiute(anno, inviaEOI0, param, opempiute, elenpere,id);

[Code] ....
   
And finally the method in which the error can occur (the method poputa is called for every id)
 
private void poputa(ElOpeIncType opereIncompiute, OpeIncType operaSingola, OiOpera opere) {
try {
//some code
} catch (NullPointerException e) {
            e.printStackTrace();
            //return id;
        }

So method invia call the method popolaScompiute, inside popolaScompiute there is an iteraction through some id and for some id can occur an error; what i want is the getting the value of id in the first method invia, using the block try/catch. Is there a way to accomplish this?

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