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Java - return status code from main()

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Created by:

Lennie-S

439

In this short article, we would like to show how to return the status code from the main function in Java.

Quick solution:

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// put at the end of the main()
​
System.exit(statusCode);
​
// e.g.
System.exit(2);

Practical example

Edit

Program.java file:

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package example;
​
public class Program {
​
    public static void main(String[] args) {
​
        System.exit(2); // 0 usually means the program ended successfully
                        //   other numbers describe error code
                        // e.g. 
                        //   here we returned error with code 2
    }
}

Example output:

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Process finished with exit code 2

Hint: in Bash, we can use exit status from program / command and do some decisions,

e.g.
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1
command
2
3
if [ $? = 2 ];
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then
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    echo "error detected";
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fi

Above code is equivalent to the following c++ / cpp code version:

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using namespace std;
​
int main()
{
    return 2; // 0 usually means the program ended successfully
              //   other numbers describe error code
              // e.g. 
              //   here we returned error with code 2
}