Found 9326 Articles for Object Oriented Programming

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.

Following is an example which compares Strings and portion of strings in Java? Explain with an example.ExampleLive Demopublic class StringDemo {    public static void main(String[] args) {       String str1 = "tutorials point";       String str2 = str1.substring(10);       int result = str1.compareTo(str2);       // prints the return value of the comparison       if (result < 0) {          System.out.println("str1 is greater than str2");       }else if (result == 0) {          System.out.println("str1 is equal to str2");       }else {          System.out.println("str1 is less than str2");       }    } }Outputstr1 is less than str2

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

Strings, which are widely used in Java programming, are a sequence of characters. In Java programming language, strings are treated as objects. The Java platform provides the String class to create and manipulate strings. You can also create a String directly as − String greeting = "Hello world!"; A string literal should be enclosed in double quotes. Whenever it encounters a string literal in your code, the compiler creates a String object with its value in this case, "Hello world!'. Example Live Demo public class StringDemo { public static void main(String args[]) { ... Read More

The concat() method of the String class concatenates the specified string to the end of this string.Exampleimport 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

The equals() 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 s1 = "tutorialspoint";       String s2 = "tutorialspoint";       String s3 = new String ("Tutorials Point");       System.out.println(s1.equals(s2));       System.out.println(s2.equals(s3));    } }Outputtrue falseYou can also compare two strings using == operator. But, it compares references to the given ... Read More

You can create a String by -Assigning a string value wrapped in " " to a String type variable.String message = "Hello Welcome to Tutorialspoint";Creating an object of the String class using the new keyword by passing the string value as a parameter of its constructor.String message = new String ("Hello Welcome to Tutorialspoint");Passing a character array to the String constructor.char arr[] = {'H','e','l','l','o'}; String message = new String(arr);