what does a question mark mean in java

by Mrs. Winona Shanahan Published 3 years ago Updated 2 years ago

In generic code, the question mark (?), called the wildcard, represents an unknown type. The wildcard can be used in a variety of situations: as the type of a parameter, field, or local variable; sometimes as a return type (though it is better programming practice to be more specific).

Full Answer

What does \N and \t mean in Java with examples?

Both n and t are called escape sequences in java. What does n mean in Java? This means to insert a new line at this specific point in the text. In the below example, "n" is used inside the print statement, which indicates that the control is passed to the next line. As a result, the text following "n" will be printed on the next line.

What does exclamation equals mean in Java?

The equals() String method in Java explained. ... does not mean the cheapskate with whitespace to get less lines at the cost of readability and easier understanding ...

What is the question mark in Java generics used for?

Wildcards in Java. The question mark (?) is known as the wildcard in generic programming . It represents an unknown type. The wildcard can be used in a variety of situations such as the type of a parameter, field, or local variable; sometimes as a return type. Unlike arrays, different instantiations of a generic type are not compatible with ...

What does a question mark and exclamation mark together mean?

Interjections - Oh!
Expletives - Damn!
Greetings - Happy Xmas!!!
Calls - Johnny!
Commands - Stop!
Expressions of surprise - What a mess!!!
Emphatic statements - I want to see you now!
Attention-getters - Listen carefully!
Loud speech in dialogue - I'm in the garden!
Ironic comments - He paid, for a change! or . . . for a change (!)

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What does question mark mean in programming?

“Question mark” or “conditional” operator in JavaScript is a ternary operator that has three operands. The expression consists of three operands: the condition, value if true and value if false. The evaluation of the condition should result in either true/false or a boolean value.Feb 11, 2021

What is the use of '?' In Java?

Overview. The ternary conditional operator ?: allows us to define expressions in Java. It's a condensed form of the if-else statement that also returns a value.Aug 30, 2021

What is the other name for question mark operator in Java?

Almost every operator has either one or two operands. This is the only operator in Java with three operands. This is called the conditional expression or the question mark-colon operator.

What does += and -= mean in Java?

compound addition assignment operator

They perform the operation on the two operands before assigning the result to the first operand. The following are all possible assignment operator in java: 1. += (compound addition assignment operator) 2. -= (compound subtraction assignment operator) 3. *= (compound multiplication assignment operator) 4.Sep 23, 2017

How do you write logical or in Java?

'Logical OR' Operator(||): This operator returns true when one of the two conditions under consideration are satisfied or are true. If even one of the two yields true, the operator results true. To make the result false, both the constraints need to return false.Nov 25, 2019

What does == mean in Java?

Both equals() method and the == operator are used to compare two objects in Java. == is an operator and equals() is method. But == operator compares reference or memory location of objects in a heap, whether they point to the same location or not.Feb 23, 2022

What is the symbol in Java?

Symbols

- !	negation (p 26) logical not (negating a condition)
* / %	multiplication (p 26) division (ignore remainder if both sides are integers) (p 26) remainder of division (modulo) (p 26)
+ -	addition (p 26) / string concatenation subtraction (p 26)

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What is Java operator called?

Precedence of Java Operators

Category	Operator	Associativity
Bitwise AND	&	Left to right
Bitwise XOR	^	Left to right
Bitwise OR	\|	Left to right
Logical AND	&&	Left to right

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What does sum mean in Java?

sum() is a built-in method in java which returns the sum of its arguments. The method adds two integers together as per the + operator. Syntax : public static int sum(int a, int b) Parameter: The method accepts two parameters which are to be added with each other: a : the first integer value.Dec 5, 2018

What does -= mean in coding?

The subtraction assignment operator ( -= ) subtracts the value of the right operand from a variable and assigns the result to the variable.Mar 25, 2022

Why is += used in Java?

Let's understand the += operator in Java and learn to use it for our day to day programming. x += y in Java is the same as x = x + y. It is a compound assignment operator. Most commonly used for incrementing the value of a variable since x++ only increments the value by one.

Use Question Mark and Colon Operator in Java

The ternary operator consists of three segments. The first is a conditional expression that returns a boolean value. The second and third are the values before and after the colon. It returns the value before the colon if the conditional expression is evaluated as true; otherwise, it returns the value after. Its syntax is below.

Use Nested Question Mark and Colon Operator in Java

In this example, we use the nested ternary operator to check whether we can do this as we do with the if ... else statement. Here, we first check whether the given integer is a positive integer, then check whether it lies in between a specified range and returns a string value. See the below example.

1. Ternary Operator

The term ternary means composed of three items or parts. The ? operator is also called the ternary operator because, unlike other operators such as strict equal ( ===) or remainder ( % ), it's the only one that takes three operands.

2. Optional Chaining

In 2020, an awesome new feature known as Optional Chaining was introduced.

3. Nullish Coalescing

In some cases, you have to set a default value for a missing property name or value.

Conclusion

Now hopefully you understand how the ? operator works in JavaScript. It looks simple, but it's one of the most powerful characters in the language. It provides syntactic sugar in three awesome but different ways.

What does the ? question mark mean in JavaScript code?

The question mark ? is an alternative to an if statement best used in the case where one of two values will be assigned to a variable based on a conditional statement.

Take a look at my ?

Q uestion marks are useful in JavaScript for quickly assigning a different value to a variable based on a condition, a very common task.

Watch out for ?

M ost developers think this code is hard to read, even though the question mark operator let me write it in just a single line of code:

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