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I have one doubt. When we use ArrayList or HashMap in Java, we have to import java.util.ArrayList or java.util.HashMap. But when we use String, it doesn't require the import statement. Can anyone clarify, why?
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java. lang classes are always implicitly imported. This means that you do not have to import them manually (explicitly).
By string literal : Java String literal is created by using double quotes. For Example: String s=“Welcome”; By new keyword : Java String is created by using a keyword “new”. For example: String s=new String(“Welcome”);
Java util package contains collection framework, collection classes, classes related to date and time, event model, internationalization, and miscellaneous utility classes. On importing this package, you can access all these classes and methods. Following table lists out the classes in the collection package.
The java.lang.String class represents character strings. All string literals in Java programs, such as "abc", are implemented as instances of this class.Strings are constant, their values cannot be changed after they are created.
How to import java.lang.String class in Java? To import any package in the current class you need to use the import keyword as
Import statement in Java is helpful to take a class or all classes visible for a program specified under a package, with the help of a single statement. It is pretty beneficial as the programmer do not require to write the entire class definition.
String is present in package java.lang which is imported by default in all java programs. Thanks Ankur.. From the documentation: ...automatically imports all of the public types declared in the predefined package java.lang.
How to take String input in Java. 1 import java.util.*; 2 class UserInputDemo1. 3 public static void main (String [] args) 4 Scanner sc= new Scanner (System.in); 5 System.out.print ("Enter a string: "); 6 String str= sc.nextLine (); 7 System.out.print ("You have entered: "+str);
String is present in package java.lang which is imported by default in all java programs.
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