You can compare two Strings in Java using the compareTo() method, equals() method or == operator.The compareTo() method compares two strings. The comparison is based on the Unicode value of each character in the strings. The character sequence represented by this String object is compared lexicographically to the character sequence represented by the argument string.The result is a negative integer if this String object lexicographically precedes the argument string.The result is a positive integer if this String object lexicographically follows the argument string.The result is zero if the strings are equal, compareTo returns 0 exactly when the equals(Object) method would ... Read More

You can check the equality of two Strings in Java using the equals() method. This method compares this string to the specified object. The result is true if and only if the argument is not null and is a String object that represents the same sequence of characters as this object.Exampleimport java.lang.* public class StringDemo {    public static void main(String[] args) {       String str1 = "Tutorialspoint";       String str2 = "Tutorialspoint";       String str3 = "Hi";             // checking for equality       boolean retval1 = ... Read More

When working with strings in Java, one of the most common operations is comparing strings to check for equality or ordering. Java provides several methods to perform string comparison: equals(), matches(), and compareTo(). While all of them are used to compare strings, each method serves a different purpose and behaves differently.   Different approaches Following are the different approaches for string comparison − equals() Method matches() Method compareTo() MethodWhen to Use Each MethodUse equals() when you need to check if two strings are identical in content.Use matches() when you ... Read More

The equalsIgnoreCase() method compares this string to the specified object. The result is true if and only if the argument is not null and is a String object that represents the same sequence of characters as this object.ExampleLive Demopublic class Sample { public static void main(String args[]) { String Str1 = new String("This is really not immutable!!"); String Str2 = Str1; String Str3 = new String("THIS IS REALLY NOT IMMUTABLE!!"); boolean retVal; retVal = Str1.equalsIgnoreCase(Str2); System.out.println("Returned Value = " + retVal ); retVal = Str1.equalsIgnoreCase( Str3 ); System.out.println("Returned Value = " + retVal ); } }OutputReturned Value = true Returned Value = true

The concat() method of the String class appends one String to the end of another. The method returns a String with the value of the String passed into the method, appended to the end of the String, used to invoke this method.Examplepublic class Test {    public static void main(String args[]) {       String s = "Strings are immutable";       s = s.concat(" all the time");       System.out.println(s);    } }OutputStrings are immutable all the timeThis replace() method of the String class returns a new string resulting from replacing all occurrences of oldChar in ... Read More

You can compare two strings using either the equals() method or the compareTo() method. Where, The equals() method compares this string to the specified object. The compareTo() method compares two strings lexicographically. The comparison is based on the Unicode value of each character in the strings. These two methods compare the given strings with respective to Case i.e. String with the different case are treated differently. Example The following example demonstrates the comparison of two strings using the equals() method − public class Sample{ public static void ... Read More

You can concatenate two strings using the concat() method of the String class. This class concatenates the specified string to the end of this string.ExampleLive Demopublic class Test {    public static void main(String args[]){       String str1 = "Krishna";       String str2 = "Kasyap";       System.out.println(str1.concat(str2));    } }OutputkrishnaKasyap

Java String class provides different comparison methods namely:The compareTo() methodThis method compares two Strings lexicographically. This method returns  a negative integer if current String object lexicographically precedes the argument string.  a positive integer if current String object lexicographically follows the argument  true when the strings are equal.Exampleimport java.lang.*; public class StringDemo {    public static void main(String[] args) {       String str1 = "tutorials", str2 = "point";       // comparing str1 and str2       int retval = str1.compareTo(str2);       // prints the return value of the comparison     ... Read More

You can concatenate strings using the ‘+’ operator of Java.ExampleLive Demopublic class Test {    public static void main(String args[]){       String st1 = "Hello";       String st2 = "How";       String st3 = "You";       String res = st1+st2+st3;       System.out.println(res);    } }OutputHelloHowYou

In Java immutable objects are those whose data can’t be changed or modified (once modified). String class is immutable i.e. once we create a String object its data cannot be modified.