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20 Αυγ 2016 · 1. You can get the list of all the files in a directory and then store them in an array. Next, using the java.io.File.getName() method, you can get the names of the files. Now you can simply use the .indexOf() method to check whether the string is a substring of the file name.
23 Μαΐ 2023 · The java.lang.String.contains () method searches the sequence of characters in the given string. It returns true if the sequence of char values is found in this string otherwise returns false. Implementation of contains () method. return indexOf(sequence.toString()) > -1;
10 Σεπ 2019 · Following Java program accepts a String value from the user, verifies whether a file contains the given String and prints the number of occurrences of the word too.
8 Ιαν 2024 · In this tutorial, we’ll review several ways of checking if a String contains a substring, and we’ll compare the performance of each. 2. String.indexOf. Let’s first try using the String.indexOf method. indexOf gives us the first position where the substring is found, or -1 if it isn’t found at all.
The contains() method checks whether a string contains a sequence of characters. Returns true if the characters exist and false if not. Syntax. public boolean contains(CharSequence chars) Parameter Values. The CharSequence interface is a readable sequence of char values, found in the java.lang package. Technical Details. String Methods.
2 Φεβ 2024 · Use String indexOf() Method to Check if a String Contains Character. Use the Enhanced for Loop to Check if a String Contains Character. Use Java Streams anyMatch() Method to Check if a String Contains a Character. Use the matches() Method With Regular Expressions to Check if a String Contains Character. Conclusion.
18 Ιαν 2013 · You can use the String.contains() function. For example: "string".contains("a"); String str = "wasd"; str.contains("a"); but you will need to call it once per every character you want to check for.
