Program to show use of some of 'String' class methods

The String class represents character strings. All string literals in Java programs, such as "abc", are implemented as instances of this class. Strings are immutable. Strings are constant; their values cannot be changed after they are created. For example: 
String str = "abc";    // Creates a string literal
OR 
String str = new String("abc");

 In this program we have used the following methods of String class:
  • length( ) : It returns the length of this string.
  • replace(CharSequence target, CharSequence replacement) : It replaces each substring of this string that matches the literal target sequence with the specified literal replacement sequence. :
  • concat(String str) : It concatenates the specified string to the end of this string.
PROGRAM
public class UsingStringMethods {

 public static void main(String[] args) {

  int n;
     String s = "Java programming", t = "", u = "";
  
     System.out.println(s);
  
     // Find length of string
  
     n = s.length();
     System.out.println("Lenght of String = " + n);
  
     // Replace characters in string
  
     t = s.replace("Java", "C++");
     System.out.println("Before replacing 'Java' by 'C++':" + s);
     System.out.println("After replacing 'Java' by 'C++':" + t);
  
     // Concatenating string with another string
  
     u = s.concat(" is fun");
     System.out.println("Before concate : " + s);
     System.out.println("After concate : " + u);
 }
}
OUTPUT 
C:\>javac UsingStringMethods.java
C:\>java UsingStringMethods
Java programming
Lenght of String = 16
Before replacing 'Java' by 'C++':Java programming
After replacing 'Java' by 'C++':C++ programming
Before concate : Java programming
After concate : Java programming is fun

Comments

  1. Davis, Miles24 July 2020 at 12:24

    If you really desire to get such type of information, visit this blog quickly.
    tops sites people look for agents

    ReplyDelete
  2. Karen Rogers12 October 2021 at 11:46

    Your contents are too straightforward to browse and easy to understand.
    UI design firm

    ReplyDelete
  3. Margie Jones13 October 2021 at 11:54

    Continue the good work; keep posting more n more n more.
    design firms

    ReplyDelete

Post a Comment

Popular posts from this blog

Program to define a class 'employee' with data members as empid, name and salary. Accept data for 5 objects using Array of objects and print it.

This program demonstrates you the array of objects.  Array of object  is the collection of objects of the same class. The given syntax will define an array of reference therefore assign object to individual reference in the array to declare the array of object. The syntax to define array of object is: <class-name> <array-name> [size]; For example, the following statement will define an array of object having size 6 references to the class  Box . Box b[6]; For creating an array of objects (allocating memory) you have to write down the following statements for (int i=0; i<6; i++) { b[i] = new Box(); // Assigning object to individual reference in the array. } PROGRAM import java.util.Scanner; public class Employee { int empid; String name; float salary; public void getInput() { Scanner in = new Scanner(System.in); System.out.print("Enter the empid :: "); empid = in.nextInt(); System.out.print("Enter the name :: ");
Read more

Program to input age from user and throw user-defined exception if entered age is negative

An  Exception  is an abnormal condition that arises in a code sequence at run time. Exceptions are run time errors. Exceptions generated by the Java are related to the fundamental errors that violate the Java language constraints. All exception classes are subtypes of the  java.lang.Exception  class. The exception class is a subclass of the  Throwable  class. Java defines several exception classes inside the standard package  java.lang . Some examples of exceptions are  ArithmeticException, ArrayIndexOutOfBoundsException, IndexOutOfBoundsException, NullPointerException, NumberFormatException, ClassNotFoundException,etc. When Java Interpreter caught an error such as divide by zero, the interpreter creates an exception object and throws it to inform that an error has occurred. Java has its own exception handling mechanism. It performs the following task: Find the problem –  Hit  the exception Inform that an error has occurred –  Throw  the exception Receives the error infor
Read more

Define a class Student with four data members such as name, roll no.,sub1, and sub2. Define appropriate methods to initialize and display the values of data members. Also calculate total marks and percentage scored by student.

In this program, first we first create a class  Student  which have data members  name, roll_no, sub1, sub2  and one method to read data here  getdata( )  method and show the result here  show( )  method. We have used  java.io.BufferedReader  class to read data from keyboard at runtime. Then we have created an object of Student class in  StudentDemo  class and called the methods of Student class. When you compile the code using  javac StudentDemo.java  command two .class files will be created which are  Student.class  and  StudentDemo.class , this has the advantage that you can reuse your .class file somewhere in other projects without compiling the code again. You can create as many classes as you want but writing many classes in a single file is not recommended as it makes code difficult to read rather you can create single file for every class. You can also group classes in packages for easily managing your code. PROGRAM import java.lang.*; import java.io.*; class Student {
Read more