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Add Kaprekar Numbers (TheAlgorithms#2881)

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src
- main/java/com/thealgorithms/maths
  - KaprekarNumbers.java
- test/java/com/thealgorithms/maths
  - KaprekarNumbersTest.java

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	`1`	`+packagecom.thealgorithms.maths;`
	`2`	`+`
	`3`	`+publicclassKaprekarNumbers {`
	`4`	`+`
	`5`	`+/* This program demonstrates if a given number is Kaprekar Number or not.`
	`6`	`+Kaprekar Number: A Kaprekar number is an n-digit number which its square can be split into two parts where the right part has n`
	`7`	`+digits and sum of these parts is equal to the original number. */`
	`8`	`+`
	`9`	`+// Checks whether a given number is Kaprekar Number or not`
	`10`	`+`
	`11`	`+publicstaticbooleanisKaprekarNumber(longnumber) {`
	`12`	`+longnumberSquared =number *number;`
	`13`	`+if(Long.toString(number).length() ==Long.toString(numberSquared).length()){`
	`14`	`+return (number ==numberSquared);`
	`15`	`+}`
	`16`	`+else{`
	`17`	`+longleftDigits1 =0,leftDigits2 =0;`
	`18`	`+if(Long.toString(numberSquared).contains("0")){`
	`19`	`+leftDigits1 =Long.parseLong(Long.toString(numberSquared).substring(0,Long.toString(numberSquared).indexOf("0")));`
	`20`	`+}`
	`21`	`+leftDigits2 =Long.parseLong(Long.toString(numberSquared).substring(0, (Long.toString(numberSquared).length() -Long.toString(number).length())));`
	`22`	`+longrightDigits =Long.parseLong(Long.toString(numberSquared).substring(Long.toString(numberSquared).length() -Long.toString(number).length()));`
	`23`	`+return (number == (leftDigits1 +rightDigits)) \|\| (number == (leftDigits2 +rightDigits));`
	`24`	`+}`
	`25`	`+}`
	`26`	`+`
	`27`	`+}`

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	`1`	`+packagecom.thealgorithms.maths;`
	`2`	`+`
	`3`	`+importorg.junit.jupiter.api.Test;`
	`4`	`+`
	`5`	`+importstaticorg.junit.jupiter.api.Assertions.*;`
	`6`	`+`
	`7`	`+publicclassKaprekarNumbersTest {`
	`8`	`+`
	`9`	`+@Test`
	`10`	`+voidtestFor1()`
	`11`	`+{`
	`12`	`+assertTrue(KaprekarNumbers.isKaprekarNumber(1));`
	`13`	`+}`
	`14`	`+`
	`15`	`+@Test`
	`16`	`+voidtestFor45()`
	`17`	`+{`
	`18`	`+assertTrue(KaprekarNumbers.isKaprekarNumber(45));`
	`19`	`+}`
	`20`	`+`
	`21`	`+@Test`
	`22`	`+voidtestFor297()`
	`23`	`+{`
	`24`	`+assertTrue(KaprekarNumbers.isKaprekarNumber(297));`
	`25`	`+}`
	`26`	`+`
	`27`	`+@Test`
	`28`	`+voidtestFor2223()`
	`29`	`+{`
	`30`	`+assertTrue(KaprekarNumbers.isKaprekarNumber(2223));`
	`31`	`+}`
	`32`	`+`
	`33`	`+@Test`
	`34`	`+voidtestFor857143()`
	`35`	`+{`
	`36`	`+assertTrue(KaprekarNumbers.isKaprekarNumber(857143));`
	`37`	`+}`
	`38`	`+`
	`39`	`+`
	`40`	`+@Test`
	`41`	`+voidtestFor3()`
	`42`	`+{`
	`43`	`+assertFalse(KaprekarNumbers.isKaprekarNumber(3));`
	`44`	`+}`
	`45`	`+`
	`46`	`+@Test`
	`47`	`+voidtestFor26()`
	`48`	`+{`
	`49`	`+assertFalse(KaprekarNumbers.isKaprekarNumber(26));`
	`50`	`+}`
	`51`	`+`
	`52`	`+@Test`
	`53`	`+voidtestFor98()`
	`54`	`+{`
	`55`	`+assertFalse(KaprekarNumbers.isKaprekarNumber(98));`
	`56`	`+}`
	`57`	`+`
	`58`	`+}`

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