How do you comment multiple lines in Java?

Multi-line comments start with /* and ends with */ . Any text between /* and */ will be ignored by Java.

How do you comment a lot of lines in Java?

Multi line comments in Java start with /* and end with */. You can comment multiple lines just by placing them between /* and */.Jul 30, 2019

How do you comment out a block of code in Java?

To comment a block:
  1. Select the required block of code.
  2. Press Ctrl + Shift + / The beginning (/*) and ending (*/) characters will be added in the appropriate places in order to mark the selected block as a comment.

How do you comment multiple lines at once?

To comment out multiple code lines right-click and select Source > Add Block Comment. ( CTRL+SHIFT+/ ) To uncomment multiple code lines right-click and select Source > Remove Block Comment. ( CTRL+SHIFT+ )

What is the multi line comment used in Java?

The multi-line comment is used to comment multiple lines of code. It can be used to explain a complex code snippet or to comment multiple lines of code at a time (as it will be difficult to use single-line comments there). Multi-line comments are placed between /* and */.

How do you set up a scanner in Java?

Create a Scanner Object in Java

// read input from the input stream Scanner sc1 = new Scanner(InputStream input); // read input from files Scanner sc2 = new Scanner(File file); // read input from a string Scanner sc3 = new Scanner(String str);

What is the standard Java compiler?

javac – Java programming language compiler.

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What are the Java data types?

Data types are divided into two groups:
  • Primitive data types – includes byte , short , int , long , float , double , boolean and char.
  • Non-primitive data types – such as String , Arrays and Classes (you will learn more about these in a later chapter)

How do you make a comment in C++?

A C++ comment is written in one of the following ways:
  1. The /* (slash, asterisk) characters, followed by any sequence of characters (including new lines), followed by the */ characters. This syntax is the same as ANSI C.
  2. The // (two slashes) characters, followed by any sequence of characters.

How do I block comments in Java?

The block comment is used to comment on many lines of code at the same time. We use /* and */ to insert block comments. Block comments can extend to many lines or be inserted within a code statement. Only the text seen between comment delimiters is considered the remark and is disregarded during compilation.

How do you print in Java?

In Java, we usually use the println() method to print the statement. It belongs to the PrintStream class.

There are following three methods to print the statements:
  1. print() Method.
  2. println() Method.
  3. printf() Method.

How do we take input in Java?

Example of integer input from user
  1. import java.util.*;
  2. class UserInputDemo.
  3. {
  4. public static void main(String[] args)
  5. {
  6. Scanner sc= new Scanner(; // is a standard input stream.
  7. System.out.print(“Enter first number- “);
  8. int a= sc.nextInt();

What is Java Util?

package java.util. Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.

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How do I run a Java class file?

Run Java . Class Files From Command Line
  1. To execute the . java class files, open the Windows command prompt or the macOS terminal.
  2. Go to the file directory or any directory where you want to run a Java file.
  3. Run javac <filename> , in our case javac Demo. …
  4. The next step is to run the class; enter java Demo.

How do I run a Java file in Terminal?

How to run a java program
  1. Open a command prompt window and go to the directory where you saved the java program (MyFirstJavaProgram. java). …
  2. Type ‘javac MyFirstJavaProgram. …
  3. Now, type ‘ java MyFirstJavaProgram ‘ to run your program.
  4. You will be able to see the result printed on the window.

How do you create a short variable in Java?

Example 1
  1. public class ShortExample1.
  2. {
  3. public static void main(String…k)
  4. {
  5. short num1=10;
  6. short num2=-10;
  7. System.out.println(“num1: “+num1);
  8. System.out.println(“num2: “+num2);

How do you create an object in Java?

To create an object of Main , specify the class name, followed by the object name, and use the keyword new :
  1. Example. Create an object called ” myObj ” and print the value of x: public class Main { int x = 5; public static void main(String[] args) { Main myObj = new Main(); System. …
  2. Example. …
  3. Second.

What is polymorphism C++?

The word polymorphism means having many forms. Typically, polymorphism occurs when there is a hierarchy of classes and they are related by inheritance. C++ polymorphism means that a call to a member function will cause a different function to be executed depending on the type of object that invokes the function.

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How do you end a comment in Java?

Java Multi-line Comments

Multi-line comments start with /* and ends with */ . Any text between /* and */ will be ignored by Java.

What is the use of keyword class?

class Java Keyword

The class keyword is used to declare a new Java class, which is a collection of related variables and/or methods. Classes are the basic building blocks of object−oriented programming. A class typically represents some real−world entity such as a geometric Shape or a Person.

How do I scan a space in Java?

Using BufferedReader Class and then splitting and parsing each value. Using nextInt( ) method of Scanner class.

  1. Using the nextInt() method of Scanner class and scan to scan the input.
  2. Using for loop to store input in an array.
  3. Iterate through the above array and parse each integer using sc. nextInt()

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