Hi,
I am getting following message when I am compiling my program on NetBeans 12.3
on Ubuntu 18.04:
cd /home/zulfi/NetBeansProjects/GUI1;
JAVA_HOME=/usr/lib/jvm/java-11-openjdk-amd64
/snap/netbeans/45/netbeans/java/maven/bin/mvn "-Dexec.args=-classpath
%classpath com.mycompany.gui1.GuiMain"
-Dexec.executable=/usr/lib/jvm/java-11-openjdk-amd64/bin/java process-classes
org.codehaus.mojo:exec-maven-plugin:3.0.0:exec
Scanning for projects...
-------------------------< com.mycompany:GUI1 >-------------------------
Building GUI1 1.0-SNAPSHOT
--------------------------------[ jar ]---------------------------------
--- maven-resources-plugin:2.6:resources (default-resources) @ GUI1 ---
Using 'UTF-8' encoding to copy filtered resources.
skip non existing resourceDirectory
/home/zulfi/NetBeansProjects/GUI1/src/main/resources
--- maven-compiler-plugin:3.1:compile (default-compile) @ GUI1 ---
Changes detected - recompiling the module!
Compiling 1 source file to /home/zulfi/NetBeansProjects/GUI1/target/classes
--- exec-maven-plugin:3.0.0:exec (default-cli) @ GUI1 ---
java.lang.NumberFormatException: For input string: ""
at
java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.base/java.lang.Integer.parseInt(Integer.java:662)
at java.base/java.lang.Integer.parseInt(Integer.java:770)
at com.mycompany.gui1.GuiMain.main(GuiMain.java:21)
------------------------------------------------------------------------
BUILD SUCCESS
------------------------------------------------------------------------
Total time: 4.664 s
Finished at: 2021-05-03T23:25:08-05:00
---------------------------------------------
My program is given below:
package com.mycompany.gui1;
import javax.swing.*;
import java.lang.NumberFormatException;
/**
*
* @author zulfi
*/
public class GuiMain {
public static void main(String[] args){
final String strFirstNum="";
final String strSecNum="";
int val1=0;
int val2=0;
try{
val1 = Integer.parseInt(strSecNum);
val2 = Integer.parseInt(strFirstNum);
}catch (NumberFormatException e) {
e.printStackTrace();}
int res = val1 + val2;
JOptionPane.showMessageDialog(null, "Testing Sum = "+ res );
}
}
Somebody please guide me.
Zulfi.
