Core java

In this post, we will see how to solve cannot make static reference to non-static method. [toc] Let’s understand this error with the help of example. package org.arpit.java2blog; public class JavaHelloWorld { public static void main(String args[]) { sayHello(); } public void sayHello() { System.out.println("Hello world from java2blog"); } } Above program won’t compile and […]

In this post, we will see how to implement distance formula between two points in java. Formula to find distance between two points ( x1, y1) and (x2 , y2) is d= sqrt( (x2-x1)^2+ (y2 – y1)^2) Here is simple program to calculate distance between two points in java. package org.arpit.java2blog; public class calculateDistanceMain { […]

In this post, we will see how to convert decimal to binary in java. There are lot of ways to convert decimal to binary in java.Let’s explore them one by one. [toc] Using Integer.toBinaryString() method You can simply use inbuilt Integer.toBinaryString() method to convert a decimal package org.arpit.java2blog; public class DecimalToBinaryInBuiltMain { public static void […]

In this post, we will see how to calculate total surface area of Cylinder in java. Formula of calculating total surface area of Cylinder is: Surface area of Cylinder = 2 *Π * r * r + 2 *Π * r * h Where r is radius of cylinder and h is height of cylinder […]

In this post, we will see how to calculate total surface area of Hemisphere in java. Hemisphere is exactly half of sphere. There can be many practical examples of Hemisphere. You can divide earth into two hemisphere i.e. Northen Hemisphere and Southern Hemisphere. Formula of calculating total surface area of Hemisphere is: surface area of […]

In this post, we will see how to get random number between 0 to 1 in java. We have already seen random number generator in java. Get Random Number between 0 and 1 in Java We can simply use Math.random() method to get random number between 0 to 1. Math.random method returns double value between […]

In this program, we will print prime numbers from 1 to 100 in java. A prime number is a number which has only two divisors 1 and itself. To check if the number is prime or not, we need to see if it has any other factors other than 1 or itself. If it has, […]

In this post, we will see about Java.lang.NumberFormatException. java.lang.NumberFormatException occurs where you try to convert any non-numeric String to Number such as Integer, Double, Float or Long. This exception generally occurs when you get input from user in the form of String. This is not Java developer‘s fault and mostly data error. In this scenario, […]

In this post, we will see about Xms and Xmx parameter in java. -Xmx specifies maximum memory size for Java virtual machine (JVM), while -Xms specifies the initial memory size. It means JVM will be started with Xms amount of memory and JVM will be able to use maximum of JVM amount of memory. Let’s […]