2020

To understand exceptional handling first it is required to understand the exception and why it should be handled in Java programs. Once we will understand this concept we can understand how to do exceptional handling. So we start with exception. What is Exception Exception means exceptional condition(s) or abnormal condition(s) which occurs during program execution….

Function Description This method is used to convert the objects and all primitive types of values into a string. It is an overloaded method. Using this valueOf() method primitive types int, long, boolean, character, float, double char array, and objects can be converted into String. To convert the passing object into string To convert a…

Function Description Java String class trim() method is used to remove the white space from the beginning and end of the string. If String does not have any leading or trailing whitespaces it does not do anything and return the same string. For example: If the string value is ” test “. It has leading…

Function Description In String class the toUpperCase () method is used to convert all the characters of the string in uppercase using the rules of the given locale. If locale is specified in method, it uses the specified locale otherwise uses the default locale calling from Locale.getDefault() during string conversion. Case mapping is based on…

Function Description In String class, the toLowerCase() method is used to convert all the characters of the string in lowercase using the rules of the given locale. If locale is specified in the method, it uses the specified locale otherwise uses the default locale calling from Locale.getDefault() during string conversion. Case mapping is based on…

Function Description Java String class lastIndexOf() method is used to get the index value of the last occurrence of the specified character within the string. It does backward search and backward search starts from the last index value or we can say at last character of the string. If fromIndex value is given, the backward…

Function Description Java String class indexOf() method is used to get the index value of the first occurrence of the specified character or the sequence of characters within the string. Search starts from the specified index, if fromIndex is given. If fromIndex value is not given, the search starts from 0 index. It returns -1,…

Function Description It is a native method. It is used to intern the string object that is created by a new keyword. After interning the string, it will be checked and created in the String constant pool. Once a String object is interned, it will check in String Constant Pool in place of heap memory….

Function Description This Java String Class method is used to break the string around all the matches of the specified regular expression and returns an Array. The array returned by this string contains each substring of the string that is broken by the sequence of characters matched to the specified regular expression. All broken substrings…

Function Description Java String class replaceAll() method is used to replace all occurrences of matching substring of the string with the given replacement string which matches the specified regular expression. Backslashes and dollar signs in the replacement are not being treated as a literal replacement string. To replace these special characters we need to use…

Function Description Java String class replace() method is used to replace all occurrences of the old character or sequence of characters respectively with new character or sequence of characters in the string. If the specified old character or sequence of characters is not found in the sting, It will return the same string. If the…

Function Description Java String Class replaceFirst() method is used to replace the first matching substring of the string with the specified replacement string which matches the given regular expression. Backslashes and dollar signs in the replacement are not being treated as a literal replacement string. To replace these special characters we need to use a…

Function Description Java String class concat() method is used to combine the specified string at the end of the string. This method returns the concatenated string if specified string’s length is greater than zero otherwise it returns the same string. For Example: If String in which we want to combine the string is “Hello” String…

Function Description The Java String Class isEmpty() function is used to check if the String is empty. It returns boolean value(true/false). It returns true if and only if the string length is 0 otherwise false Method Signature public boolean isEmpty() Parameter none Return Type The Return Type is boolean, true if string length is zero…

Function Description The Java String class equalsIgnoreCase() method is used to compare the string with the specified string. It is case insensitive during the comparison. It returns boolean true/false value. Both strings will be equal if they are of the same length and corresponding characters in both the strings are the same, irrespective of the…

Function Description This method is used to compare the Java String with the specified object. It returns boolean true/false value. It is case sensitive during comparison. Both String objects will be equal only if both have the same sequence of characters as well as the same character case(lowercase/uppercase). For Example: If you have 4 String…

Function Description The Java String class join() method is used to concatenate the specified CharSequence arguments together using the specified delimiter. It is a static method and returns a concatenated string. If an argument is passed as a null element, it concatenates the “null” as a string. In String class join() method is defined as…

Function Description The Java String class contains() method is used to verify/search a specified sequence of characters in the string. It is case sensitive and checks the sequence of character as well as the case of the character(s). It returns true if the specified sequence of character(s) found in the string otherwise false. Method Signature…

Function Description The Java String class substring() method is used to get the substring of the string. The substring begins from the character specified at the begin-index to the end of the string or to the character specified at end-index.  In returned substring, character at begin-index is included while character at end-index is excluded. In…