The String class of the java.lang package represents a set of characters. All string literals in Java programs, such as "abc", are implemented as instances of this class. Strings objects are immutable, once you create a String object you cannot change their values, if you try to do so instead of changing the value a new object is created with the required value and the reference shifts to the newly created one leaving the previous object unused.The StringBuffer (and StringBuilder) class is used when there is a necessity to make a lot of modifications to a String.Unlike Strings, objects of ... Read More

You can find whether a String contains a specified sequence of characters using any of the methods −The indexOf() method − The indexOf() method of the String class accepts a string value and finds the (starting) index of it in the current String and returns it. This method returns -1 if it doesn’t find the given string in the current one.The contains() method − The contains a () method of the String class accepts a sequence of characters value and verifies whether it exists in the current String. If found it returns true else it returns false.In addition to these, you ... Read More

The split() method of the String class accepts a String value representing the delimiter and splits into an array of tokens (words), treating the string between the occurrence of two delimiters as one token.For example, if you pass single space “ ” as a delimiter to this method and try to split a String. This method considers the word between two spaces as one token and returns an array of words (between spaces) in the current String.If the String does not contain the specified delimiter this method returns an array containing the whole string as an element.Example Live Demopublic class SplitExample ... Read More

No, while defining multiple classes in a single Java file you need to make sure that only one class among them is public. If you have more than one public classes a single file a compile-time error will be generated.ExampleIn the following example we have two classes Student and AccessData we are having both of them in the same class and declared both public. Live Demoimport java.util.Scanner; public class Student {    private String name;    private int age;    Student(){       this.name = "Rama";       this.age = 29;    }    Student(String name, int age){   ... Read More

Java provides certain classes called wrapper classes in the java.lang package. The objects of these classes wrap primitive datatypes within them. Following is the list of primitive data types and their respective classes −Primitive datatypeWrapper classcharCharacterbyteByteshortShortintIntegerlongLongfloatFloatdoubleDoublebooleanBooleanPackageWrapper classes in Java belong to the java.lang package, Therefore there is no need to import any package explicitly while working with them.ExampleThe following Java example accepts various primitive variables from the user and creates their respective wrapper classes. Live Demoimport java.util.Scanner; public class WrapperClassesExample {    public static void main(String args[]){       Scanner sc = new Scanner(System.in);       System.out.println("Enter an integer ... Read More

Java provides I/O Streams to read and write data where a Stream represents an input source or an output destination which could be a file, i/o devise, other programs, etc.In general, a Stream will be an input stream or, an output stream.InputStream − This is used to read data from a source.OutputStream − This is used to write data to a destination.Based on the data they handle there are two types of streams −Byte Streams − These handle data in bytes (8 bits) i.e., the byte stream classes read/write data of 8 bits. Using these you can store characters, videos, ... Read More

The .properties is an extension in java which is used to store configurable application. It is represented by the Properties class in Java, you can store a properties file and read from it using the methods of this class. This class inherits the HashTable class.Creating a .properties file −To create a properties file −Instantiate the Properties class.Populate the created Properties object using the put() method.Instantiate the FileOutputStream class by passing the path to store the file, as a parameter.ExampleThe Following Java program creates a properties file in the path D:/ExampleDirectory/ Live Demoimport java.io.FileOutputStream; import java.io.IOException; import java.util.Properties; public class CreatingPropertiesFile { ... Read More

An exception is an issue (run time error) that occurred during the execution of a program. When an exception occurred the program gets terminated abruptly and, the code past the line that generated the exception never gets executed.Multiple exceptions in a codeWhenever we have a code that may generate more than one exception and if you need to handle them specifically you can use multiple catch blocks on a single try.try{    //code } catch(Exception1 ex1) {    // } catch(Exception2 ex2) {    // }Example Live Demoimport java.util.Arrays; import java.util.Scanner; public class MultipleCatchBlocks {    public static void main(String [] ... Read More

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.Example Live Demoimport java.io.FileInputStream; import java.io.FileNotFoundException; import java.util.Scanner; public class FindingWordFromFile {    public static void main(String args[]) throws FileNotFoundException {       //Reading the word to be found from the user       Scanner sc1 = new Scanner(System.in);       System.out.println("Enter the word to be found");       String word = sc1.next();       boolean flag = false;       int count = 0;       ... Read More

The readUTF() method of the java.io.DataOutputStream reads data that is in modified UTF-8 encoding, into a String and returns it.ExampleThe following Java program reads a UTF-8 text from a .txt file using the readUTF() method.import java.io.DataInputStream; import java.io.EOFException; import java.io.FileInputStream; import java.io.IOException; public class UTF8Example {    public static void main(String args[]) {       StringBuffer buffer = new StringBuffer();       try {          //Instantiating the FileInputStream class          FileInputStream fileIn = new FileInputStream("D:\test.txt");          //Instantiating the DataInputStream class          DataInputStream inputStream = new DataInputStream(fileIn); ... Read More