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Java program to display diamond pattern

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Diamond pattern: Diamond pattern Program Example: import java.util.Scanner; public class Diamond { public static void main(String[] args) { int i,j,k,p,q,r; Scanner sc = new Scanner(System.in); System.out.print("Enter the values: "); int n = sc.nextInt(); int spaces = n-1; for(i=0;i<n;i++) { for(j=0;j<spaces;j++) { System.out.print(" "); } for(k=0;k<=i;k++) { System.out.print("* "); } spaces--; System.out.println(); } spaces = 1; for(p=(n-1);p>0;p--) { for(q=0;q<spaces;q++) { System.out.print(" "); } for(r=0;r<p;r++) { System.out.print("* "); } System.out.println(); spaces++; } } } Output: Enter the values: 7       *      * *     * * *    * * * *   * * * * *  * * * * * * * * * * * * *  * * * * * *   * * * * *    * * * *     * * ...
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Prime Number Program in Java

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Prime Number Program in Java: The prime number is a natural number who value is greater than 1 and can be divisible by 1 and by itself. The number of counts to find the prime numbers is 2 because it can divisible only by 1 and by itself For example: 6 - can be divisible by 1x6,2x3,3x2,6x1. where the count is 4 and it is not a prime number 7 - can be divisible by 1x7,7x1. where the count is 2 and it is a prime number Example 1: Program to check whether the given number is prime number or not import java.util.Scanner; public class Primenumbers { public static void main(String[] args) { int i =2; boolean flag = true; System.out.print("Enter the number to find it is prime or not: "); Scanner sc = new Scanner(System.in); int n = sc.nextInt(); if(n<0) { System.out.println("The prime number cannot be negative"); } else { while(i<n) { if(n%i==0) { flag = false; break; } i++;...
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StringBuffer methods in java

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StringBuffer methods in java: As we know that StringBuffer and StringBuilder are mutable where you can edit / modify without creating the new String object /instance. StringBuffer and StringBuilder provides different methods to be done on String. The methods in StringBuffer and StringBuilder are similiar the only difference is StringBuffer is synchronized and thread safe where StringBuilder is non-synchronized and it is not thread safe. See the Difference between StringBuffer and StringBuilder Syntax: int length() int capacity() void ensureCapacity(int MinimumCapacity) void trimToSize() void setLength(int length) char charAt(int index) int codePointAt(int index) int codePointBefore(int index) int codePointCount(int Beginindex, int Endindex) int offsetByCodePoints(int index, int offsetcodepoint) void getChars(int srcBegin, int srcEnd, char[], int destinationBeginindex) void setCharAt(int index, char ch) StringBuffer delete(int beginIndex, int endIndex) StringBuff...
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