The code you are using \1+ just removes consecutive occurrences only. You can use the below code.SELECT REPLACE_REGEXPR('(.)(?=.*\1)' IN '22331122' WITH '' OCCURRENCE ALL)  FROM DUMMYThe output will come out to be “312”. This will remove all multiple occurrences and only last one will be kept.

A try/catch block is placed around the code that might generate an exception. Code within a try/catch block is referred to as protected code, and the syntax for using try/catch looks like the following –Syntaxtry {    // Protected code } catch (ExceptionName e1) {    // Catch block }The ... Read More

Serialization Java provides a mechanism, called object serialization where an object can be represented as a sequence of bytes that includes the object's data as well as information about the object's type and the types of data stored in the object.Exampleimport java.io.*; public class SerializeDemo {    public static void ... Read More

It can be illustrated with the help of an example in which we are creating a stored generated column in the table named ‘triangle_stored’. As we know that stored generated column can be generated by using the keyword ‘stored’.Examplemysql> Create table triangle_stored(SideA DOUBLE, SideB DOUBLE, SideC DOUBLE AS (SQRT(SideA * ... Read More

The fill(int[] a, int val) method of the java.util.Arrays class assigns the specified int value to each element of the specified array of integers.Exampleimport java.util.Arrays; public class ArrayDemo {    public static void main(String[] args) {       int arr[] = new int[] {1, 6, 3, 2, 9}; ... Read More

The hashCode(int[]) method of the java.util.Arrays class returns a hash code based on the contents of the specified array. For any two non-null int arrays a and b such that Arrays.equals(a, b), it is also the case that Arrays.hashCode(a) == Arrays.hashCode(b).Exampleimport java.util.Arrays; public class ArrayDemo {    public static void main(String[] ... Read More

You can access a plain text using the File class.ExampleLive Demoimport java.io.File; public class ReadFile {    public static void main(String[] args) {       File f = null;       String str = "data.txt";       try {          f = ... Read More

The java.io.File.mkdirs() creates the directory named by this abstract pathname, together with necessary and non-existent parent directories.ExampleLive Demoimport java.io.File; public class Main {    public static void main(String[] args) {       String directories = "D:\a\b\c\d ";       File file = new File(directories);       boolean ... Read More

You can access the private methods of a class using java reflection package.Step1 − Instantiate the Method class of the java.lang.reflect package by passing the method name of the method which is declared private.Step2 − Set the method accessible by passing value true to the setAccessible() method.Step3 − Finally, invoke ... Read More

To fix this issue, you need to add try/catch response to the code. When you don’t include an authorization header, it results in an error 401 from the server.try {     CatalogService.CatalogChangeClient service =      new CatalogService.CatalogChangeClient();     service.ClientCredentials.UserName.UserName = "username";     service.ClientCredentials.UserName.Password = "password";   ... Read More