javabufferjava-iosystem.out

Why does System.out.print cause autoflush?

System.out is a PrintStream object. I read the documentation on PrintStream. What I don't get is why System.out.print causes the buffer to be flushed? Shouldn't that happen only for println?

Solution

  • Shouldn't that happen only for println?

    No. Where did you get that idea? The Javadoc says

    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.

    NB The Javadoc doesn't say when it won't be flushed. And it says it will be flushed on a println() or a newline.