I have one function whose return type is VOID and it prints directly on console.
However I need that output in string so that I can work on it.
As I cant make any changes with function with return type is VOID so I have to redirect that output to string.
How can I redirect it in JAVA?
There are many questions regarding redirecting stdout to string but they redirect only input taken from user and not output of some function...
If the function is printing to
System.out, you can capture that output by using the
System.setOut method to change
System.out to go to a
PrintStream provided by you. If you create a
PrintStream connected to a
ByteArrayOutputStream, then you can capture the output as a
// Create a stream to hold the output ByteArrayOutputStream baos = new ByteArrayOutputStream(); PrintStream ps = new PrintStream(baos); // IMPORTANT: Save the old System.out! PrintStream old = System.out; // Tell Java to use your special stream System.setOut(ps); // Print some output: goes to your special stream System.out.println("Foofoofoo!"); // Put things back System.out.flush(); System.setOut(old); // Show what happened System.out.println("Here: " + baos.toString());
This program prints just one line: