The object is a basic building block of an OOPS language. In Java, we cannot execute any program without creating an object. There is various way to create an obiect in java that we will discuss in this section, and also learn how to create an object in Java.

java provides five ways to create an object.

• Using new Keyword
• Using clone() method
• Using newInstance() method of the Class class
• Using newInstance() method of the Constructor class
• Using Deserialization

Using new Keyword

Using the new keyword is the most popular way to create an object or instance of the class. When we create an instance of the class by using the new keyword, it allocates memory (heap) for the newly created object and also returns the reference of that object to that memory. The new keyword is also used to create an array. The syntax for creating an object is:

• Using new Keyword
• Using clone() method
• Using newInstance() method of the Class class
• Using newInstance() method of the Constructor class
• Using Deserialization

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ASCII acronym for American Standard Code for Information Interchange. It is a 7-bit character set contains 128 (0 to 127) characters. It represents the numerical value of a character. For example, the ASCII value of A is 65.

In this section, we will learn how to print ASCII value or code through a Java program.

There are two ways to print ASCII value in JAVA

• Assigning a Variable to the int Variable
• Using Type-Casting

Assigning a Variable to the int Variable

To print the ASCII value of a character, we need not use any method or class. Java internally converts the character value to an ASCII value. In the following program, we have assigned two characters a and b in the ch1 and ch2 variables, respectively. To find the ASCII value of a and b, we have assigned ch1 and ch2 variables to the integer variables asciivalue1 and asciivalue2, respectively. Finally, we have printed the variable asciivalue1 and asciivalue2 in which ASCII values of the characters are stored.

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In this example, we will implement the graph data structure in Java.

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In this example, we will learn to remove elements from the Java LinkedList.

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In this example, we will learn to insert elements to the Java LinkedList

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In this example, we will learn to access elements from a LinkedList in Java using various methods.

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An Armstrong number is a positive m-digit number that is equal to the sum of the m^th powers of their digits. It is also known as pluperfect, or Plus Perfect, or Narcissistic number. It is an OEIS sequence A005188. Let’s understand it through an example.

Armstrong Number Example

1: 1¹ = 1

2: 2¹ = 2

3: 3¹ = 3

153: 1³ + 5³ + 3³ = 1 + 125+ 27 = 153

125: 1³ + 2³ + 5³ = 1 + 8 + 125 = 134 (Not an Armstrong Number)

1634: 1⁴ + 6⁴ + 3⁴ + 4⁴ = 1 + 1296 + 81 + 256 = 1643

Similarly, we can check other number also.

The first few Armstrong numbers between 0 to 999 are 1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407. Some other Armstrong numbers are 1634, 8208, 9474, 54748, 92727, 93084, 548834, 1741725, 4210818, 9800817, 9926315, 24678050, 24678051, 88593477, 146511208, 472335975, 534494836, 912985153, 4679307774, 32164049650, 32164049651.

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Factorial Program in Java: Factorial of n is the product of all positive descending integers. Factorial of n is denoted by n!. For example:

Here, 4! is pronounced as “4 factorial”, it is also called “4 bang” or “4 shriek”.

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Palindrome number in java: A palindrome number is a number that is same after reverse. For example 545, 151, 34543, 343, 171, 48984 are the palindrome numbers.

Palindrome number algorithm

• Get the number to check for palindrome
• Hold the number in temporary variable
• Reverse the number
• Compare the temporary number with reversed number
• If both numbers are same, print “palindrome number”
• Else print “not palindrome number”

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Prime number in Java: Prime number is a number that is greater than 1 and divided by 1 or itself only. In other words, prime numbers can’t be divided by other numbers than itself or 1.

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