![]() ![]() If the startIndex is 0, the function returns the original string object. If the startIndex is less than 0 or greater than the length of the original string, a StringIndexOutOfBoundsException is thrown. The function first checks whether the startIndex is valid. In the first implementation, the function takes only one parameter, startIndex. Here's an example program that uses the substring() method in Java, including some exception handling and corner cases: Some Exception Handling and Corner Cases Programs in Java The resulting substring is then assigned to the substrate variable and printed to the console. This means that the new substring will start at index 6 (which is the letter 'W' in "World") and end at index 11 (which is the last letter 'd' in "World"). In this example, the substring() method is called on the str string with parameters 6 and 11. String str = "Hello World" String substr = str.substring(6, 11) (substr) // Output: "World" It returns a new string containing the original string's characters from the begIndex (inclusive) up to the endIndex (exclusive). The Java substring(begIndex, endIndex) method extracts a portion of a given string. String str = "Hello, World!" String substr = str.substring(7, 12) To do this, we may utilize the substring() technique as seen below: Assume we have a string "Hello, World!" and wish to extract the substring "World". Let's look at an example to see how the substring() method functions. (str.substring(str.toLowerCase().How Does the Method of Substring() Operate? For example, we want “World Java” to be returned from “Hello World Java” even though I pass small ‘w’. In this example, we’ll get a the substring based on a character but by ignoring the case of given character. Output: orl Get Substring Based on a Character by Ignoring the Case As substring anyhow returns the string till the preceding index we don’t have to subtract from the index of ‘d’.Since we need the characters between two characters, we need to fetch next letter of ‘W’, for this reason we added +1 to the index of ‘W’.We are getting the required indexes of ‘W’ and ‘d’ using indexOf method.We want to read substring between two characters ‘W’ and ‘d’, that is, “orl”.In this example, we want to read substring between two characters, for example, substring between ‘W’ and ‘d’ is “orl”. Output: World Get Substring Between Two Characters ![]() This entire substring method call will return “World” as desired.We’ve added +1 to end index as substring will return String till preceding character of end index.For end index, we have passed character ‘d’ to indexOf method.For begin index, we have passed character ‘W’ to indexOf method.Since, we want the string to be returned from 2 indexes we have used substring method with begin index and end index.We want to read from character ‘W’ to ‘d’, that is, “World” from “Hello World Java”.In this example, we want the substring from one character to another character, that is, from ‘W’ to ‘d’. Output: Hello World Get Substring from One Character to Another Character The substring method, using these begin and end indexes return “Hello World”.However, you need to note that substring method will return the string starting from begin index till the preceding letter of the end index (endIndex -1), that is the reason why we add 1 to the end index.We’ve passed character d which is the last letter of desired string as an argument to indexOf method to get the index.In the second argument, we are calling indexOf method to return the index of the desired character.We’ve used substring method and passed 0 as the first argument, as we want to read the String from start.We want to read “Hello World” from “Hello World Java”.In this example, we want to return a substring from start till a given character. Output: World Java Get Substring Which is Before a Character in Java The returned value will be “World Java”.Once we receive the index from indexOf method, the substring method will use that index as the begin index.The indexOf function will return the index of the given character.In this example, we will read a substring of a String from a given character till the end using the substring and indexOf functions. Get Substring Which is After a Character in Java Unfortunately, String class doesn’t provide us with an out of box substring method to get a substring based on a character, however you can use indexOf method in combination of substring to achieve what we want. In this example, we’ll look into examples on substring based on a given character in Java. String class provides us with powerful String processing methods, out of those, substring is one. ![]()
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