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. [crayon-6a298376d7251782828134/] When you run above program, you will get below output: BigDecimal bd: […]

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. There are multiple ways to delay execution of java program […]

In this post we will see how to print table of number in java. It is good program to practice for loop in java. [crayon-6a298376e5271771239698/] Output: Enter a Number : 8 Table of 8 is 8 * 1 = 8 8 * 2 = 16 8 * 3 = 24 8 * 4 = 32 […]

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 [crayon-6a298376e7174646654256/] Output: Enter Marks for 5 Subjects : 50 60 70 80 90 […]

In this post, we will see how to find and count vowels in a string. 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. [crayon-6a298376ecd33186888458/] When you compile above java file, you will get below error. java:8: reached end […]

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. [crayon-6a298376ef086794713040/] Let’s create a program to implement 2d Arraylist java. [crayon-6a298376ef08e803687709/] Output: 2nd element in list3 : List3_Str2 3nd element in list1 : List1_Str3 1st element in list2 […]

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. 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+ [crayon-6a298376f0c10088634719/] Output: 223 is numeric : true […]