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1. Top results related to what are night operations in java

   • What operations in Java are considered atomic?

     Top Answer

     Answered Feb 23, 2024 · 113 votes

     • all assignments of primitive types except for long and double
     • all assignments of references
     • all assignments of volatile variables
     • all operations of java.concurrent.Atomic* classes

     and maybe something more. Look at the jls.

     As noted in the comments, atomicity does not imply visibility. So while another thread is guaranteed not to see a partially written int, it may never see the new value.

     The operations on long and double are on common 64 bit CPUs atomic as well, although there's no guarantee. See also this feature request.

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   • In Java, what are the boolean "order of operations"?

     Top Answer

     Answered Feb 15, 2010 · 73 votes

     The Java Tutorials has a list illustrating operator precedence. The equality operators will be evaluated first, then &&, then ||. Parentheses will be evaluated before anything else, so adding them can change the order. This is usually pretty much the same from language to language, but it's always a good idea to double check.

     It's the small variations in behavior that you're not expecting that can cause you to spend an entire day debugging, so it's a good idea to put the parentheses in place so you're sure what the order of evaluation will be.

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     2/5

   • What does it mean intermediate operations are lazily executed whereas terminal operations are eagerly executed in java Stream API?

     Top Answer

     Answered Oct 22, 2018 · 18 votes

     Say you had the following operation.

     list.stream() .map(a -> a * a) .filter(a -> a > 0 && a < 100) .map(a -> -a) .forEach(a -> System.out.println(a));

     The intermediate operations are the maps and filters, the terminal operation is the forEach. If intermediate operations were eagerly executed, then .map(a -> a * a) would immediately map the whole stream and the result would be passed to .filter(a -> a > 0 && a < 10) which would immediately filter the result, which would then be passed to .map(a -> -a) which would map the filtered result and then pass it to forEach which would then immediately print each element from the stream.

     However, intermediate operations are not eager, instead they are lazy. What this means is that the sequence

     list.stream() .map(a -> a * a) .filter(a -> a > 0 && a < 100) .map(a -> -a)-

     does not actually do anything right away. It just creates a new stream that remembers the operations it is supposed to carry out, but does not actually carry them out until it is time to actually produce a result. It is not until forEach tries to read a value from the stream that it then goes to the original stream, takes a value, maps it using a -> a * a, filters it, and if it passes the filter, maps it using a -> -a and then passes that value to forEach.

     It's like someone working in a restaurant that has been given the job of taking all the plates from the dirty pile, washing them, stacking them up and then giving them to the cook when he is ready to serve the food. If the person was eager, they would immediately take the whole pile of dirty plates, wash them all at once, and stack them up, then when the cook wants the plates, he hands them off one by one for serving.

     However, a lazy employee would realize that the cook only needs one plate at a time, and only when the food is ready to serve. So when ever the cook needs a plate, the employee just takes one plate from the pile, washes it and hands it to the chef, going one by one until the plates are all washed and all the food is served.

     So what's the advantage?

     Well one major advantage is that the lazy approach considerably improves latency. As you are probably aware, a single thread of a program can only do one thing at a time. Extending the analogy a bit further, imagine there are about 800 plates, but the cook actually had to wait for the washer to finish washing the dishes and then hand one to him. If the eager washer insisted on washing all the plates first before handing any over, the cook would have to wait for all 800 plates to be washed, then serve 800 meals at once, by which point all the angry customers would have left.

     However, with the lazy washer, for each meal the cook wants to serve, he only has to wait for one plate. So if washing a plate takes 10 seconds and serving is nearly instant, in scenario 1 all meals would be served at once but only after waiting for more than two hours. But in scenario 2, each meal is served about 10 seconds apart. So even though it takes the same amount of time to serve all meals, scenario 2 is certainly more desirable.

     I've stretched the analogy a bit thin here, but hopefully this helps you understand it better.

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   • What are Generics in Java?

     Top Answer

     Answered Sep 11, 2021 · 114 votes

     Generics allow you to customize a "generic" method or class to whatever type you're working with. For example, suppose you have a method that adds two numbers together. In order to work with the types themselves, you might have to create multiple versions of this method. For instance:

     public int Add(int a, int b)-public double Add(double a, double b)public float Add(float a, float b)

     Generics allow you to create a single method that is customized for the type that invokes it.

     public <T> T Add(T a, T b)-

     T is substituted for whatever type you use.

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     4/5

   • What are Lists in Java

     Top Answer

     Answered May 14, 2014 · 0 votes

     A List in java, is an ordered collection. I suppose you are a beginner and confused with syntax. If you have java decompiler, you can see that LinkedList and ArrayList are also classes. Which means somewhere some good person has done the coding for you and provided you a class which is similar to your "LinkedIntList" and provided you out of the box. You don't need to create a new class if java provides sufficient functionality for you.

     But sometimes, the out of the box classes are not sufficient for our requirements. In that case we have to write our own implementation of classes, such as your class "LinkedIntList".

     In this case, it seems you need size and one element hence you are creating it on your own.

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     5/5

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2. www.w3schools.com › java › java_operatorsJava Operators - W3Schools

   www.w3schools.com › java › java_operators

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   Start the Exercise. Previous Next . Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML and more.

3. www.geeksforgeeks.org › operators-in-javaOperators in Java - GeeksforGeeks

   www.geeksforgeeks.org › operators-in-java

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   Apr 9, 2024 · Types of Operators in Java. There are multiple types of operators in Java all are mentioned below: Arithmetic Operators; Unary Operators; Assignment Operator; Relational Operators; Logical Operators; Ternary Operator; Bitwise Operators; Shift Operators; instance of operator; 1. Arithmetic Operators

4. People also ask

   What are arithmetic operators in Java?

   • Now let’s look at each one of the arithmetic operators in Java: 1. Addition (+): This operator is a binary operator and is used to add two operands. Syntax: Example: 2. Subtraction (-): This operator is a binary operator and is used to subtract two operands. Syntax: Example: 3.

   Java Arithmetic Operators with Examples - GeeksforGeeks

   www.geeksforgeeks.org/java-arithmetic-operators-with-examples/

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   What are operators in Java?

   • Operators in Java are the symbols used for performing specific operations in Java. Operators make tasks like addition, multiplication, etc which look easy although the implementation of these tasks is quite complex. There are multiple types of operators in Java all are mentioned below: 1. Arithmetic Operators

   Operators in Java - GeeksforGeeks

   www.geeksforgeeks.org/operators-in-java/

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   What are unary operators in Java?

   • As the name implies, unary operators only require one single operand. For example, we usually use unary operators to increment, decrement, or negate a variable or value. Now, let’s see the details of unary operators in Java. 3.1. The Unary Plus Operator The unary plus operator (+) indicates a positive value.

   Java Operators | Baeldung

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   What are logical operators in Java?

   • We have two logical operators in Java: the logical AND and OR operators. Basically, their function is pretty similar to the AND gate and the OR gate in digital electronics. Usually, we use a logical operator with two operands, which are variables or expressions that can be evaluated as boolean.

   Java Operators | Baeldung

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5. docs.oracle.com › javase › tutorialOperators (The Java™ Tutorials > Learning the Java Language ...

   docs.oracle.com › javase › tutorial

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   Operators are special symbols that perform specific operations on one, two, or three operands, and then return a result. As we explore the operators of the Java programming language, it may be helpful for you to know ahead of time which operators have the highest precedence.

6. stackoverflow.com › questions › 1991380What does the ^ operator do in Java? - Stack Overflow

   stackoverflow.com › questions › 1991380

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   Jan 2, 2010 · What does the ^ operator do in Java? Asked 14 years, 4 months ago. Modified 1 month ago. Viewed 457k times. 325. What function does the ^ (caret) operator serve in Java? When I try this: int a = 5^n; ...it gives me: for n = 5, returns 0. for n = 4, returns 1. for n = 6, returns 3. ...so I guess it doesn't perform exponentiation.

   Code sample

   Operator Name Example Result Description

   a & b and 3 & 5 1 1 if both bits are 1.

   a | b or 3 | 5 7 1 if either bit is 1.

   a ^ b xor 3 ^ 5 6 1 if both bits are different.

   ~a not ~3 -4 Inverts the bits....

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7. www.baeldung.com › java-operatorsJava Operators | Baeldung

   www.baeldung.com › java-operators

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   Jan 8, 2024 · Overview. Operators are a fundamental building block of any programming language. We use operators to perform operations on values and variables. Java provides many groups of operators. They are categorized by their functionalities. In this tutorial, we’ll walk through all Java operators to understand their functionalities and how to use them. 2.

   • Author: Kai Yuan

8. www.zetcode.com › java › operatorJava operator - operators, expressions, precedence ...

   www.zetcode.com › java › operator

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   Jan 27, 2024 · Java sign operators. There are two sign operators: + and -. They are used to indicate or change the sign of a value. com/zetcode/SignOperators.java. package com.zetcode; public class SignOperators { public static void main(String[] args) { System.out.println(2); System.out.println(+2); System.out.println(-2); } }

9. www.geeksforgeeks.org › java-arithmetic-operatorsJava Arithmetic Operators with Examples - GeeksforGeeks

   www.geeksforgeeks.org › java-arithmetic-operators

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   Mar 28, 2023 · Java too provides many types of operators which can be used according to the need to perform various calculations and functions, be it logical, arithmetic, relational, etc. They are classified based on the functionality they provide. Here are a few types: Arithmetic Operators. Unary Operators. Assignment Operator. Relational Operators.