Read and Write data from other processes on the Java Virtual Machine

The exec () method of the Runtime object can be used to obtain the Process objects of other processes. The Process object represents the sub-processes started by the Java program. The Process class provides the following three methods, used to allow the program to communicate with its child processes.

InputStream getErrorStream (): gets the error stream of the sub-process

InputStream getInputStream (): gets the input stream of the sub-process.

OutputStream getOutputStream (): gets the output stream of the sub-process.

The following code implements error output for obtaining sub-Processes

[Java]
Import java. io. BufferedReader;
Import java. io. InputStreamReader;
 
 
Public class Test {
Public static void main (String [] args) throws Exception
{

Process p;runtime.getruntime(cmd.exe c ("adb ");
BufferedReader br = new BufferedReader (new InputStreamReader (p. getErrorStream ()));
String str = null;
While (str = br. readLine ())! = Null)
{
System. out. println (str );
}
 
}

 
 

}

Import java. io. BufferedReader;
Import java. io. InputStreamReader;

Public class Test {
Public static void main (String [] args) throws Exception
{

Process p;runtime.getruntime(cmd.exe c ("adb ");
BufferedReader br = new BufferedReader (new InputStreamReader (p. getErrorStream ()));
String str = null;
While (str = br. readLine ())! = Null)
{
System. out. println (str );
}

}
 

 
}
The following program demonstrates the communication between two Java programs.

This number of parent Processes

[Java]
Import java. io. OutputStream;
Import java. io. PrintStream;
 
 
Public class Test {
Public static void main (String [] args) throws Exception
{
Process p;runtime.getruntime(cmd.exe c ("java work ");
OutputStream OS = p. getOutputStream ();
PrintStream ps = new PrintStream (OS );
Ps. println ("translated ");
OS. close ();


}

 
 

}

Import java. io. OutputStream;
Import java. io. PrintStream;

Public class Test {
Public static void main (String [] args) throws Exception
{
Process p;runtime.getruntime(cmd.exe c ("java work ");
OutputStream OS = p. getOutputStream ();
PrintStream ps = new PrintStream (OS );
Ps. println ("translated ");
OS. close ();


}
 

 
}

Below are the sub-Processes

[Java]
Import java. io. FileOutputStream;
Import java. io. PrintStream;
Import java. util. collections;
 
Public class work {
Public static void main (String [] args) throws Exception {
Pipeline SC = new pipeline (System. in );
FileOutputStream FCM = new FileOutputStream ("work ");
PrintStream ps = new PrintStream (FCM );
System. setOut (ps );
While (SC. hasNextLine ())
{
System. out. println (SC. nextLine ());
}
Ps. close ();
 
}
 
}

Import java. io. FileOutputStream;
Import java. io. PrintStream;
Import java. util. collections;

Public class work {
Public static void main (String [] args) throws Exception {
Pipeline SC = new pipeline (System. in );
FileOutputStream FCM = new FileOutputStream ("work ");
PrintStream ps = new PrintStream (FCM );
System. setOut (ps );
While (SC. hasNextLine ())
{
System. out. println (SC. nextLine ());
}
Ps. close ();

}

}