All About Basic

Have you ever faced this exception while executing sql query in  your software  or  database?? Well, I am using  Java programming language in the front end and PostGreSQL in the backend i.e. server side. Recently I have faced the following  exception which was showing actually from the database. I searched internet for the solution but didn’t get any reliable solution. But at last I have solved it and sharing the solution procedure with you. Hope it will also work with your problem

Here is the problem (Exception)

Batch entry 0 insert into endproduct_mat_req(item_no,end_product_mat_no,mat_no,qty) values(523,71,44,100000.0) was aborted.  Call getNextException to see the cause

Continue reading “Solution of Batch entry 0 insert into postgresql database table, Call getNextException to see the cause|| Learn How to solve this exception or error ||Java PostgreSQL Database Exception.” →

After a long time I am sharing a post related to Java Programming language. Recently, I have faced a problem while coding   on java HashMap key value set on my job. In my last post I have shown How to show Java HashMap Key value pair and work on it. But the problem I have faced is to convert the Key value set to Vector or String. I used two (2) integer type data, separated with colon, as the key value of my HashMap.  What I need to convert that colon separated key values to individual integer and then convert them or stored them on Vector.

Sometimes while working with software using java programming language we may face problem while working with JTable. In JTable Cell you may need to show JButton for various purposes. So, to show JButton in JTable Cell or to fill up JTable’s Column with JButton you will need to use ButtonRenderer and ButtonEditor and to add Click Event on the JButton in JTable cell you will need to add ActionListener for that JButton.

While designing or preparing  software you may face problem  to check  JTable cell is empty or not while entering JTable data in Database. Another thing may happen, suppose you are trying to validate your JTable cell empty or not but it is taking space or null entry as a string and your empty cell validation may not work. Here I am sharing you a little but useful technique by which you will be able to check your empty JTable cell and also if you enter space in the JTable cell it will catch this cell as empty and will show error. Just run the given program and check how it works.

Today I am sharing with you another important topic where I will give you an example by which you will get a clear idea about how to read or search any Bengali or Bangla font from a text pad (notepad) or file and then show it in JTextField. This code is important for those who are trying to prepare English to Bengali Dictionary. Download the reader.txt which I have used here to read Bengali (Bangla) words.

Sometimes we may need to use the value of a vector mainly the integer or numeric value in SQL to execute a query . Suppose you have a vector named   studentAge which contains two numeric value for example: [10,12]. Now, if you want to use these two vectors in the SQL to for query execution then you have to write the query as given below.

Continue reading “Java Vector Numeric value and SQL Query: How to use Numeic or integer values of a vector in SQL and also how to execute them.” →

Sometimes in java while we do coding and use HashMap we may need to check or see the values reside in Key and their corresponding Data or Values at the same time. Here I am sharing you another simple but useful technique to see the key value pair data of HashMap at a time. Just copy the code below and run it on your computer.

Continue reading “Java HashMap Key Value Pair: How to show the Key Value pair data of HashMap.” →

Today I am sharing you another basic but important technique about string manipulation. While coding in java, sometimes we need to split or break a string into individual word according to space, commas, colon or any other character between them and then save that individual words into an array of string.

Continue reading “Java break string in into individual words: How to split a string according to space,comma, colon and more between them and then save it in an array of string.” →

Here, I am sharing you another basic technique about java where I have searched a word in a String and then replace it by another word. In this technique I have avoided case differences (avoiding upper case or lower case letter difference). From this example you will be able to know about

1. How to search any specific word in a string



2. How to avoid case difference  while searching a word in a string using java
3. How to replace any specific word ignoring case difference.

Continue reading “Java String Manipulation: How to search or match any given word in a string and then replace that word” →