Core java

In this post, we will see how to convert BigInteger toBigDecimal in java. Using BigDecimal constructor You can simply use BigDecimal’s following constructor to convert BigInteger to BigDecimal. BigDecimal(BigInteger val) Here is the complete example to convert BigInteger to BigDecimal in java. package org.arpit.java2blog; import java.math.BigDecimal; import java.math.BigInteger; public class BigDecimalToBigIntegerMain { public static void […]

In this post, we will see how to delay java program for few secs or wait for seconds for java program to proceed further. We need to delay a java programs in many situation where we want to wait for some other task to finish. [toc] There are multiple ways to delay execution of java […]

In this post we will see how to print table of number in java. It is good program to practice for loop in java. import java.util.Scanner; public class TableOfNumber { public static void main(String args[]){ int number, i, table; Scanner scan = new Scanner(System.in); System.out.print("Enter a Number : "); number = scan.nextInt(); System.out.print("Table of " […]

In this post, we will see how to calculate grade of students in java. Student’s grade is decided by average of marks.It is good program to practice execution of if statements in java. Here is simple program to calculate grade of students package org.arpit.java2blog; import java.util.Scanner; public class GradeCalculation { public static void main(String args[]){ […]

In this post, we will see how to find and count vowels in a string. [toc] Find Vowels in a String If any character in String satisfy below condition then it is vowel and we will add it to Hashset. character==’a’ || character==’A’ || character==’e’ || character==’E’ || character==’i’ || character==’I’ || character==’o’ || character==’O’ […]

In this post, we will see how to solve reached end of file while parsing in java. We generally get this error when we forgot to end code of block(class/method) with }. Let’s understand this with the help of example. package org.arpit.java2blog; public class HelloWorld { public static void main(String[] args) { System.out.println("Hello world from […]

Learn about how to remove last character from String in java using different ways.

In this post, we will see how to create 2d Arraylist in java. Best way to create 2d Arraylist is to create list of list in java. List<List> arraylist2D = new ArrayList<List>(); Let’s create a program to implement 2d Arraylist java. package org.arpit.java2blog; import java.util.ArrayList; import java.util.List; public class Java2DArrayListMain { public static void main(String[] […]

In this post, we will see how to implement isNumeric method in java. There are many way to check if String is numeric or not. [toc] Let’s see one by one. Using regular expressions You can use below regular expression to check if string is numeric or not. [-+]?\\d*\\.?\\d+ package org.arpit.java2blog; public class JavaisNumericMain { […]