String Features

In Java, a String is a class that represents a sequence of characters. It is one of the most commonly used classes in Java, and it is part of the java.lang package, so you don't need to import anything special to use it.

Here are some basic operations and features related to String in Java:

Creating Strings:

• You can create a string using the String literal or the new keyword.

String str1 = "Hello, World!";
String str2 = new String("Hello, World!");

String Concatenation:

• You can concatenate strings using the + operator.

String firstName = "Akash";
String lastName = "Sheikh";
String fullName = firstName + " " + lastName;  // Results in "Akash Sheikh"

String Length:

• You can get the length of a string using the length() method.

String str = "Java";
int length = str.length();  // Results in 4

Accessing Characters:

• You can access individual characters in a string using the charAt() method.

char firstChar = str.charAt(0);  // Gets the first character 'J'

Substring:

• You can extract a substring from a string using the substring() method.

String part = str.substring(1, 3);  // Gets the substring from index 1 to 2 ("av")

String Comparison:

• You can compare strings using the equals() method for content comparison or compareTo() for lexicographical comparison.

String str1 = "Java";
String str2 = "Java";
boolean isEqual = str1.equals(str2);  // true

Immutable Nature:

• Strings in Java are immutable, meaning their values cannot be changed after they are created. Operations that seem to modify strings actually create new string objects.

String Formatting:

• You can format strings using methods like printf() or format() for more complex formatting.

String formattedString = String.format("Hello, %s!", "World");
System.out.println(formattedString);  // Outputs: "Hello, World!"

String Methods:

• The String class provides various methods for manipulating strings, such as toUpperCase(), toLowerCase(), trim(), and more.

String str = "   Java Programming   ";
String trimmedStr = str.trim();  // Removes leading and trailing whitespaces
String upperCaseStr = str.toUpperCase();
String lowerCaseStr = str.toLowerCase();

These are just some basic features of the String class in Java. There's much more you can do with strings in Java, depending on your specific needs.

-Akash Sheikh

Jr. Software Engineer at Nitto Digital Services and Analytics Ltd.