Category: Java

Call equals() and equalsIgnoreCase() method on known String Always call equals() method on known String which is not null. Since equals() method is symmetric, calling a.equals(b) is same as calling b.equals(a), and that’s why many programmer don’t pay attention on object a and b. One side effect of this call can result in NullPointerException, if caller is null. Prefer valueOf()...

Sometimes we feel System.out.println is a long statement to print. static import may shorten it a bit but it is not recommended, because it results in poor readability. I am just using this situation to explain static import and avoid using it in the below scenario.  

out’ object can be customized. out gets initialized by java runtime environment at startup and it can be changed by developer during execution. Instead of standard output, in default cases when you run a program through command line, the output is printed in the same command window. We can change that behavior using setOut method as below. In the following...

System.out.println is a Java statement that prints the argument passed, into the System.out which is generally stdout. System – is a final class in java.lang package. As per javadoc, “…Among the facilities provided by the System class are standard input, standard output, and error output streams; access to externally defined properties and environment variables; a means of loading files and...