Java

The regular expression uses the “( )” round bracket to identify the matching groups in a string. The matched character in the round bracket identified as a match group in…

The java exception java.util.regex.PatternSyntaxException: Unclosed character class near index 0 happens when the string is matched by the regular expression special character ‘[’ open square bracket. In a search string,…

The java exception java.util.regex.PatternSyntaxException: Dangling meta character ‘*’ near index 0 happens when the string is matched by the regular expression meta character such as “*”, “+”, “?”. In a…

The java.util.regex.PatternSyntaxException is thrown when the regular expression – regex pattern is not correct. The java String matches method checks the given string with the specified regular expression. If the…

The java.io.UnsupportedEncodingException occurs when an unsupported character encoding scheme is used in java strings or bytes. The java String getBytes method converts the requested string to bytes in the specified…

The java.lang.StringIndexOutOfBoundsException: String index out of range arises when the string index is either negative, or larger than the length of the string, i.e. out of range The java string…

In Java, “String index out of range” exception is thrown in java substring() & charAt() method. Here, we see the exception “java.lang.StringIndexOutOfBoundsException: String index out of range: 0“. If a…

Writing to a file in Java is known as writing content from a java variable value or object to a text or binary file using stream classes like FileWrite, FileOutputStream,…

Error: Could not find or load main class error occurs if java could not find or load the main class, or if an error occurred when loading the main class.…

Error: Could not find or load main class is a common error encountered in Java programming. This error occurs when the Java Virtual Machine (JVM) is unable to locate the…

A Java Bean is a java class that should follow the java bean standards and requirements. If a java class meets the java bean specification, the java class is called…

Array Declaration in Java The declaration of a Java array is similar to that of any other variable declaration in Java. The array is specified with square brackets, either with…

In Java, you can initialize an array list in one line by using array literals and stream literals. Use the Arrays.asList(), List.of(), and Stream.of() APIs to create an array list in a single…

Java String split using delimiter – In Java, the split() method splits a string with delimiter provided in a given regular expression and returns a string array. The split method divides…

Synchronization is a process that does not allow more than one thread for a resource at any time. In the java multi-threaded environment, multiple threads attempt to access the same…

Continue statements in java is used to terminate the rest of the code in the loop and execute the next iteration. Java Continue statement is used for any type of…

Break statements are used to terminate the loop immediately, based on the condition and continues to executes the following code to the loop.Break statements are used in the switch statements…

The java ternary operator or conditional operator is supported in languages such as java, javascript, python, c / c++, c# etc. The java ternary operator or conditional operator takes three…

The switch case in java matches the given value from multiple values and executes the corresponding switch statement. Java Switch contains multiple cases. In each switch case, there is a…

Bitwise operators in Java manipulate individual bits of a number. Bitwise Operator in Java is used on integral types, byte, short, int and long. Java Bitwise Operators includes AND, OR,…