Methods Of String Class In Java With Example -

What is String Class In Java

The String Class In Java handles character strings.

All string literals in Java programs, like “abc”, are implemented as instances of this class.

Strings can’t have their values changed once they’ve been created. String buffers can change strings.

Since String objects are immutable, they can be shared.

Can we extend the String Class in Java?

The String Class In Java Is Immutable it cannot be extended in any way, and none of its features can be overridden.

Without further ado, I will further Explain String Class In Java with some basic examples in order for you to easily understand the topic.

The String Class Methods In Java are collections of characters that are frequently used in Java programming.

Strings are considered objects in the Java programming language.

For creating and manipulating strings, the Java platform offers the String class.

Creating Strings In Java

Writing a string is the simplest way see the example below.

String name = “Glenn Magada Azuelo”;

The compiler constructs a String object with the value “Glenn Magada Azuelo” whenever it sees a string literal in your code.

Methods Of String Class In Java can be created using the new keyword and a constructor, just like any other object.

There are 11 constructors available for the String class, allowing you to initialize a string from a variety of sources, including an array of characters.

Strings in Java Example Program

public class StringDemo {

   public static void main(String args[]) {
      char[] nameArray = { 'G', 'l', 'e', 'n', 'n', '.' };
      String nameString = new String(nameArray);  
      System.out.println( nameString );
   }
}

Output:

Glenn.

In order for you to test the Java code provided in this lesson, you must test the code in your code editor.

You can test the above example here! ➡Java Online Compiler

Note -The String Class In Java Is Immutable it can’t be changed, so once a String object is made, it can’t be changed.

String Buffer and String Builder Classes should be used when you need to make a lot of changes to strings of characters.

String Length in Java

The String Length In Java can be found with the length() method of the Java String class.

The number of Unicode code units in a Java string is the same as the length of the string.

Accessor methods are ways of getting information about an object.

The length() accessor method can be used with strings. It returns the number of characters in the string object.

The following program is an example of using the length() method of the String Class In Java.

String Length In Java Example Program

// program by Glenn Magada Azuelo
public class StringDemo {

   public static void main(String args[]) {
      String name = "Angel Jude Suarez Is Handsome";
      int len = name.length();
      System.out.println( "String Length is : " + len );
   }
}

Output:

String Length is : 29

You can test the above example here! ➡Java Online Compiler

Concatenating Strings

There is a method in the String class for joining two strings together. This is called concatenating.

stringOne.concat(stringTwo);

This will return a new string, string1 with string2 added at the end. You can also use the concat () method in string literals, such as-.

“My name is “.concat(“Glenn Magada Azuelo”);

Most of the time, the + operator is used to concatenated strings, as in.

“Hello,” + ” Glenn” + “!”

result in.

“Hello, Glenn!”

Let’s look at the example below.

Concatenating Strings Example Program

// praogram by Glenn Magada Azuelo
public class StringDemo {

   public static void main(String args[]) {
      String stringOne = "Magada ";
      System.out.println("Glenn " + stringOne + "Azuelo");
   }
}

Output:

Glenn Magada Azuelo

You can test the above example here! ➡Java Online Compiler

Creating Format Strings

The Strings format() method returns a formatted string using the given locale, specified format string, and arguments.

Using this method, we can add the strings together and also change the way the resulting string looks.

There are two ways to print output with formatted numbers: printf() and format().

The String class has a similar method called format(), but instead of returning a PrintStream object, it returns a String object.

Using String’s static format() method, you can make a formatted string that you can use more than once.

This is different from a print statement, which only works once.

For example.

Format Strings Example

// Sample is created By Glenn
System.out.printf(“The value of the float variable is ” +
“%f, while the value of the integer ” +
“variable is %d, and the string ” +
“is %s”, floatVar1, intVar1, stringVar1);

You can make another sample:

// Sample Created By Glenn
String formatString;
formatString = String.format(“The value of the float variable is ” +
“%f, while the value of the integer ” +
“variable is %d, and the string ” +
“is %s”, floatVar1, intVar1, stringVar1);
System.out.println(formatString);