- What does 3 dots mean in Java?
- What does * do in regex?
- What does B mean in Java?
- Is equal to Java?
- Are strings equal in Java?
- What does \\ s+ mean in Java?
- What is String  args?
- What is difference between == equals () and compareTo () method?
- What does %d mean in Java?
- How do you write not equal in a string in Java?
- What does not mean in Java?
- What does a zA Z0 9 mean?
- Can we compare two strings using == in Java?
- Can Varargs be null?
- What does \\ mean in Java?
What does 3 dots mean in Java?
var argsThe three dots ( …
) are used in a function’s declaration as a parameter.
These dots allow zero to multiple arguments to be passed when the function is called.
The three dots are also known as var args ..
What does * do in regex?
* : An asterisk is used to match the preceding character zero or more times. So the regex . * would match any string at all as long as it did not contain a newline character.
What does B mean in Java?
byte arrayIt means a byte array. In the Java descriptor syntax, a [ at the beginning means an array. There’s a one letter code for each primitive type – B = Byte, C = Char, S = Short, Z = Boolean, I = Int, J = Long, F = Float, and D = Double.
Is equal to Java?
Double equals operator actually compares objects references. In Java, string equals() method compares the two given strings based on the data / content of the string. If all the contents of both the strings are same then it returns true. If all characters are not matched then it returns false.
Are strings equal in Java?
Java String equals() Method The equals() method compares two strings, and returns true if the strings are equal, and false if not. Tip: Use the compareTo() method to compare two strings lexicographically.
What does \\ s+ mean in Java?
\s – matches single whitespace character. \s+ – matches sequence of one or more whitespace characters.
What is String  args?
The String args parameter is an array of Strings passed as parameters when you are running your application through command line in the OS. … String args means an array of sequence of characters (Strings) that are passed to the “main” function. This happens when a program is executed.
What is difference between == equals () and compareTo () method?
The 2 main differences are that: equals will take any Object as a parameter, but compareTo will only take Strings. equals only tells you whether they’re equal or not, but compareTo gives information on how the Strings compare lexicographically.
What does %d mean in Java?
decimal integerThe %d specifies that the single variable is a decimal integer. The %n is a platform-independent newline character. The output is: The value of i is: 461012. The printf and format methods are overloaded.
How do you write not equal in a string in Java?
It is symbolized “!= ” or “(!a. equals(b))” and checks if the values of two operands are equal or not, in case that values are not equal then condition becomes true. After the comparison, this operator returns a boolean value(true or false).
What does not mean in Java?
not operatorThe not operator is a logical operator, represented in Java by the ! symbol. It’s a unary operator that takes a boolean value as its operand. The not operator works by inverting (or negating) the value of its operand.
What does a zA Z0 9 mean?
The bracketed characters [a-zA-Z0-9] mean that any letter (regardless of case) or digit will match. … The _ (underscore) character in the regular expression means that the zone name must have an underscore immediately following the alphanumeric string matched by the preceding brackets.
Can we compare two strings using == in Java?
In String, the == operator is used to comparing the reference of the given strings, depending on if they are referring to the same objects. When you compare two strings using == operator, it will return true if the string variables are pointing toward the same java object. Otherwise, it will return false .
Can Varargs be null?
A varargs parameter always has a type, and you can send a single value of that type – or an array of that type. … The parameter can be null, although Eclipse wants you cast the null – and your code must be prepared to deal with nulls (or you will throw a NullPointerException ). When using mockit.
What does \\ mean in Java?
After the Java compiler is done, only one \ is left, as \\ means the character \ . The string thus looks like this: \. Now the Java regular expression interpreter kicks in, and interprets the remaining backslash as an escape character.