Anonymous user
Execute a system command: Difference between revisions
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→{{header|Java}}: Highlighting, note about different OSs
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=={{header|Java}}==
{{works with|Java|1.5+}}
<lang
import java.io.*;
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public static void main(String[] args) {
try {
Process p = Runtime.getRuntime().exec("cmd /C dir");//Windows command, use "ls -oa" for UNIX
Scanner sc = new Scanner(p.getInputStream());
while (sc.hasNext()) System.out.println(sc.nextLine());
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{{works with|Java|1.4+}}
There are two ways to run system commands. The simple way, which will hang the JVM (I would be interested in some kind of reason). -- this happens because the the inputStream buffer fills up and blocks until it gets read. Moving your .waitFor after reading the InputStream would fix your issue (as long as your error stream doesn't fill up)
<lang java>import java.io.IOException;▼
▲import java.io.IOException;
import java.io.InputStream;
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}</lang>
And the right way, which uses threading to read the InputStream given by the process.
<lang java>import java.io.IOException;▼
▲import java.io.IOException;
import java.io.InputStream;
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}
}
}</lang>
=={{header|Logo}}==
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