java.lang.ProcessBuilder command(List<String> command)
Description
This java example source code demonstrates the use of command(List<String> command) method of ProcessBuilder class.
Some takeaways on this method:
- This method sets this process builder’s operating system program and argument.
- This method does not make a copy of the command list. Subsequent updates to the list will be reflected in the state of the process builder.
- It is not checked whether command corresponds to a valid operating system command.
- NullPointerException can be thrown by this method if the argument is null.
Method Syntax
public ProcessBuilder command(List<String> command)
Method Argument
| Data Type | Parameter | Description |
|---|---|---|
| List<String> | command | the list containing the program and its arguments |
Method Returns
The command(List<String> command) method returns this ProcessBuilder.
Compatibility
Requires Java 1.5 and up
Java ProcessBuilder command(List<String> command) Example
Below is a java code demonstrates the use of command(List<String> command) method of ProcessBuilder class.
package com.javatutorialhq.java.examples;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/*
* This example source code demonstrates the use of
* command(List command) method of Double class
*/
public class ProcessBuilderCommandList {
public static void main(String[] args) {
/*
* This is a concrete example
* that launch the command prompt
* and execute directory listing
*/
List alist = new ArrayList<>();
// add the list of commands to the list
alist.add("cmd.exe");
alist.add("/C");
alist.add("start;dir /w;");
// initialize the processbuilder
ProcessBuilder builder = new ProcessBuilder();
builder.command(alist);
try {
// start the process
builder.start();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Sample Output
Below is the sample output when you run the above example.
