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Java program to print the prime numbers

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java program to find prime numbers from 1 to n import java.util.Scanner; public class PrimeNum { public static void main( String [] args) { Scanner sc=new Scanner ( System .in); System .out.println("Enter your limit : "); int limit=sc.nextInt(); for ( int i = 1; i < limit; i++) { boolean k = true; for ( int j = 2; j <= i/2; j++) { if (i % j == 0) { k = false; break ; } } if (k) { System .out.println(i); } } } } Java program to check a number weather is it prime or not import java.util.Scanner; public class PrimeCheck{ public static void main(String args[]) { Scanner sc = new Scanner ( System .in); System .out.println("Enter the number : "); int n = sc.nextInt(); int flag = 0; for ( int i = 2; i <= n / 2; i++) { ...
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Number Pattern programs in java

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Simple number pattern program in java 1) Enter a number : 5 1 12 123 1234 12345 import java.util.Scanner; public class Pattern1 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System .out.println( "Enter a number :" ); int n = scanner.nextInt(); for ( int i = 1; i <= n; i++) { for ( int j = 1; j <= i; j++) { System .out.print(j); } System .out.println(); } } } 2) Enter a number : 5 12345 1234 123 12 1 import java.util.Scanner; public class Pattern2 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.println("Enter a number :"); int n = scanner.nextInt(); for (int i = n; i > 0; i--) { for (int j = 1; j <= i; j++) { System.out.print(j); } System.out.println(); } } } 3) Enter a number :5     1    1 2   1 2 3  1 2 3 4 1 2 3 4 5  import java.util.Scanner; public class Pa...
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Different ways to reverse a string in java program

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There are multiple ways to reverse a string in java progarm 1. Using for loop: import java.util.Scanner; public class JavaReverseString{ public static void main( String [] args) { Scanner sc= new Scanner ( System . in ); System . out .println("Enter the string to reverse: "); String str = sc.nextLine(); System . out .println("String after reverse: "); for ( int i = str.length()-1; i >=0; i--) { System . out .print(str.charAt(i)); } } } 2. Using StringBuffer import java.util.Scanner; public class JavaReverseString{ public static void main( String [] args) { Scanner sc = new Scanner ( System . in ); System . out .println("Enter the string to reverse: "); String str = sc.nextLine(); String reverse = new StringBuffer (str).reverse().toString(); System . out .println("String after reverse:" + reverse); } } ...
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