runtime.exec - java Runtime process - check if waiting for input -

i wish create process using java's runtime: example. process proc = runtime.getruntime().exec("cmd");

then, want somehow wait process until in 'ready input' state, verify has finished of work. anyway on how it?

one thing possible echoing "---finished---" , checking if line written using stdin of process. dislike idea.

is there better (more formal) approach this?

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by way, need effect descriobed it. want wait before writing new commands batch file.

thank you.

here couple ideas. hinge on whether or not program you're running expects read , write stdin , stdout.

there's no need wait "ready input" state once you've launched process. if need send commands, use getoutputstream , write them. if other program still getting ready, data you've written happily sit in buffer until program reads stdin.

using processbuilder let control arguments , environment. example direct javadocs:

processbuilder pb = new processbuilder("mycommand", "myarg1", "myarg2"); map<string, string> env = pb.environment(); env.put("var1", "myvalue"); env.remove("othervar"); env.put("var2", env.get("var1") + "suffix"); pb.directory(new file("mydir")); process p = pb.start(); 

then, read or write:

outputstream out = p.getoutputstream(); out.write("some useful data".getbytes()); out.flush();