Double decimal formatting in Java
One of the way would be using NumberFormat. Output: 4.00
Java
what is Ljava.lang.String;@
The method works if you provide an array. The output of is (the number after @ is almost always different) Please tell us the return type of Employee.getSelectCancel()
What is the meaning of “%d:%02d” in `printf`?
Even though I’m not 100% sure what “%d:%02d” means Here you go: %d means an integer : is a : %02d means an integer, left padded with zeros up to 2 digits. More info at https://docs.oracle.com/javase/8/docs/api/java/util/Formatter.html#syntax
Printing string variable in Java
You’re getting the toString() value returned by the Scanner object itself which is not what you want and not how you use a Scanner object. What you want instead is the data obtained by the Scanner object. For example, Please read the tutorial on how to use it as it will explain all. EditPlease look here: Scanner tutorial Also have … Read more
Error Importing SSL certificate : Not an X.509 Certificate
Does your cacerts.pem file hold a single certificate? Since it is a PEM, have a look at it (with a text editor), it should start with —–BEGIN CERTIFICATE—– and end with —–END CERTIFICATE—– Finally, to check it is not corrupted, get hold of openssl and print its details using openssl x509 -in cacerts.pem -text
InvalidKeyException Illegal key size
This error means that your Java virtual machine uses a policy that only allows restricted cryptography key sizes due to US export laws. Java 9 and higher The Unlimited Strength Jurisdiction Policy Files are included with Java 9 and used by default (see Security Updates in the Java 9 Migration Guide). If you get this error … Read more
Exception in thread “main” java.lang.ArrayIndexOutOfBoundsException
I am a beginner to programming. I’m a few weeks into my first programming class, so please bear with me. I am not a person to ask for help, so I have searched for an answer extensively with no luck. This is also my first time posting anything in any type of forum, so if … Read more
How to check if my string is equal to null?
As further comment, you should be aware of this term in the equals contract: From Object.equals(Object): For any non-null reference value x, x.equals(null) should return false. The way to compare with null is to use x == null and x != null. Moreover, x.field and x.method() throws NullPointerException if x == null.
int cannot be converted to string?
You can convert to String using Integer.toString() :
copy a 2d array in java
There are two good ways to copy array is to use clone and System.arraycopy(). Here is how to use clone for 2D case: For System.arraycopy(), you use: I don’t have a benchmark but I can bet with my 2 cents that they are faster and less mistake-prone than doing it yourself. Especially, System.arraycopy() as it is implemented in native code. Hope this … Read more