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How to Install Java? How to set Paths in Java?

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Step-1: Download the JDK From official website is: https://www.oracle.com/technetwork/java/javase/downloads/index.html  and click on JDK download button for latest version Step-2: click on Accept License Agreement.  click the Download link that corresponds to the  . exe  for your version of Windows. Step-3: Run the JDK Installer .exe file Start the JDK 11 installer by double-clicking the installer's icon or file name in the download location. Follow the instructions provided by the Installation wizard. once installation is complete click on Close. For setting the permanent path of JDK, you need to follow these steps: 1. Open Advanced System Settings In Windows 10 press Windows key + Pause Key, This will open the System Settings window. Go to  Change settings  and select the  Advanced  tab. Alternatively: Open “Windows search” – you will find it next to the Windows logo open Windows 10 search 1. In the search field type in – 
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What is char charAt (int index) in Java, and how can I use it?

Java String charAt() method The Java String charAt() method returns the character at the specified index. The index value should lie between 0 and length()-1. Signature: public char charAt(int index) Parameter: index- Index of the character to be returned. Return: returns character at the specified position. Exception: StringIndexOutOfBoundsException- If index is negative or greater then the length of the String. Example: To show working of  charAt()  method class Gfg {      public static void main(String args[])      {          String s = "Welcome! to Java Planet" ;              char ch = s.charAt( 3 );          System.out.println(ch);              ch = s.charAt( 0 );          System.out.println(ch);      } } Output: c W Let's see the example of charAt() method where we are passing greater index value. In such case, it throws StringIndexOutOfBoundsException at run time. // Java program to demonstrate // working of c
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What is the alert log?

Each database has an alert log file, which contains a chronological(sequential order in which they occurred) log of database messages and errors. Oracle will automatically create a new alert log file whenever the old one is deleted. The alert log includes the following errors and log messages: All internal errors (ORA-600), block corruption errors (ORA-1578), and deadlock errors (ORA-60). Administrative operations such as DDL statements and the SQL*Plus commands STARTUP, SHUTDOWN, ARCHIVE LOG, and RECOVER. Several messages and errors relating to the functions of shared server and dispatcher processes. Errors during the automatic refresh of a materialized view Find the Location of alert log file in Oracle To view alert log, first you need to find it’s location using select command. SQL> SELECT VALUE FROM V$DIAG_INFO WHERE NAME = 'Diag Trace'; VALUE -------------------------------------------------------------------------------- /u01/app/oracle/diag/rdbms/orcl/orcl/trace To vi
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