printstream

I have a function that takes an object of a certain type, and a PrintStream to which to print, and outputs a representation of that object. How can I capture this function's output in a String? Specifically, I want to use it as in a toString method. ChssPly76 Use a ByteArrayOutputStream as a buffer: import java.io.ByteArrayOutputStream; import java.io.PrintStream; import java.nio.charset.StandardCharsets; final ByteArrayOutputStream baos = new ByteArrayOutputStream(); try (PrintStream ps = new PrintStream(baos, true, "UTF-8")) { yourFunction(object, ps); } String data = new String(baos

public PrintWriter(OutputStream out, boolean autoFlush) : out - An output stream autoFlush - A boolean; if true, the println, printf, or format methods will flush the output buffer public PrintStream(OutputStream out, boolean autoFlush) : out - The output stream to which values and objects will be printed autoFlush - A boolean; if true, the output buffer will be flushed whenever a byte array is written, one of the println methods is invoked, or a newline character or byte ('\n') is written What was the reason for changing autoflush logic between these classes? Because they are always

The Javadoc for PrintStream#print(char) states Prints a character. The character is translated into one or more bytes according to the platform's default character encoding, and these bytes are written in exactly the manner of the write(int) method. So this means that following code should print 2 'a' however prints one 'a' not two. System.out.print('a'); System.out.write('a'); Can some one help me understand this behaviour As per the java docs of PrintStream#write Writes the specified byte to this stream. If the byte is a newline and automatic flushing is enabled then the flush method will be

I have seen in the System class that the out object (of type PrintStream ) is initialized with a null value. How can we call method like System.out.prinln(""); ? In System class out variable initialized like this way: package java.lang; public final class System { public final static PrintStream out = nullPrintStream(); private static PrintStream nullPrintStream() throws NullPointerException { if (currentTimeMillis() > 0) { return null; } throw new NullPointerException(); } } As per shown above code out variable initialized by null and this variable is final, so it can not initialized further

I just want to know, we usually close streams at the end, but why don't we close System.out PrintStream with System.out.close() ? If you close it you will no longer be able to write to the console, so let's leave this task to the VM when the process terminates. You should only close streams that you own or have manually created. System.out is out of your control, so leave it to the creator to take care of. ratchet freak because we didn't open it the VM did and it's his job to close it unless otherwise documented it's similar to the C++ adage of I don't own it, don't delete it. You can still

I found the code below from the internet, works but it doesn't write the printed console to omt.txt, it only writes the System.out.println statements after the second catch block.If you run the code once you will understand what I mean.All I want is to write what is on console to the "omt.txt" file that is all... After some answers, I see that my question wasn't clear, sorry for that. I want to save console output to omt.txt text file. If on the console "Hello 123" is printed , it should be also in omt.txt file.In other words whatever on the console is printed should be simultaneously written