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.

Given a string and its substring(s) of length k, write a Java program to compare and find whether the substrings are equal or not. Substring is a small portion of characters from a large string. In Java, a String is a class that represents a contiguous block of characters. Using compareTo() Method The compareTo() method belongs to the String class of java.lang package. It compares two strings based on the Unicode value of each character contained in the strings. It returns 0 if the specified strings are equal. Example In this example, we are using the compareTo() method to ... Read More

The concat() method of the String class concatenates the specified string to the end of this string.ExampleLive Demoimport java.lang.*;    public class StringDemo {       public static void main(String[] args) {       // print str1       String str1 = "self";       System.out.println(str1);       // print str2 concatenated with str1       String str2 = str1.concat(" learning");       System.out.println(str2);       // prints str3 concatenated with str2(and str1)       String str3 = str2.concat(" center");       System.out.println(str3);    } }Outputself self learning self learning center

When you store a String asString str1 = "Hello";directly, then JVM creates a String object with the given value in a separate block of memory known as String constant pool.And whenever we try to create another String asString str2 = "Hello";JVM verifies whether any String object with the same value exists in the String constant pool, if so, instead of creating a new object JVM assigns the reference of the existing object to the new variable.And when we store String asString str = new String("Hello");using the new keyword, a new object with the given value is created irrespective of the ... Read More

The compareTo() method of the String class. This method compares two Strings lexicographically. 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. This method returnsa negative integer if current String object lexicographically precedes the argument string.a positive integer if current String object lexicographically follows the argumenttrue when the strings are equal.ExampleLive Demoimport java.lang.*; public class StringDemo {    public static void main(String[] args) {       String str1 = "tutorials", str2 = "point";   ... Read More