The example works correctly. The compareTo() method is called by a string object and takes another string object as argument. The return value is integer and is difference in Unicode values of characters of respective strings when they are not equal. The value can be -ve, 0 or +ve.

the main() method in Java code is itself inside a class. The static keyword lets the main() method which is the entry point of execution without making an object but you need to write a class. In C++, main() is outside the class and writing class it self is not mandatory. Hence, C++ is not a pure object oriented language bu Java is a completely object oriented language.

You can use Advanced IDE to use multiple files. Here is the link:https://www.tutorialspoint.com/online_java_compiler.php

1) take a string from the user and check contains atleast one digit or not:Extract character array from string using toCharArray() method. Run a for loop over each character in array and test if it is a digit by static method isDigit() of character classpublic static boolean chkdigit(String str) { char arr[]=str.toCharArray(); for (char ch:arr) { if (Character.isDigit(ch)) { return true; } } return false; }2.) take ... Read More

It is a bitwise right shift operator. The bit pattern is shifted towards right by number of places stipulated by operand on right. Bits on left are set to 0For example a=60 (00111100 in binary), a>>2 will result in 15 (00001111 in binary)>>> a=60 >>> bin(a)result #39;0b111100' >>> b=a>>2 >>> bin(b) '0b1111'

Java lang package provides Integer class which has methods to convert an integer to String and vice versa. You can convert a String to an integer using the parseInt() method and Integer to String using the toString() method.ExampleLive Demopublic class Sample {    public static void main(String args[]){       String str = "1212";       int num = Integer.parseInt(str);       System.out.println(num);       String st = Integer.toString(num);       System.out.println();    } }Output1212

Java lang package provides a Double class which has methods to convert Double to String and vice versa. You can convert a String to a double using the parseDouble() method and double to String using the toString() methodExampleLive Demopublic class StringDouble {    public static void main(String args[]){       Double data1 = 2.2;       String str = Double.toString(data1);       System.out.println(str);       Double data2 = Double.parseDouble(str);       System.out.println(data2);    } }Output2.2 2.2

Java String class provides several variants of valueOf() method. These accept various data types and convert them into String.ExampleLive Demopublic class Sample {    public static void main(String args[]){       int i = 200;       float f = 12.0f;       char c = 's';       char[] ch = {'h', 'e', 'l', 'l', 'o'};       String data = String.valueOf(i);       System.out.println(String.valueOf(i));       System.out.println(String.valueOf(f));       System.out.println(String.valueOf(c));       System.out.println(String.valueOf(ch));    } }Output200 12.0 s hello

The toString() method of the String class returns itself a string.ExampleLive Demoimport java.io.*; public class Test {    public static void main(String args[]) {       String Str = new String("Welcome to Tutorialspoint.com");       System.out.print("Return Value :");       System.out.println(Str.toString());    } }OutputReturn Value :Welcome to Tutorialspoint.comThe value of method variants of the String class accepts different variables such as integer, float, boolean etc.. and converts them into String.ExampleLive Demopublic class Sample {    public static void main(String args[]){       int i = 200;       float f = 12.0f;       ... Read More

You can change the cases using the toUpperCase() and toLowerCase() methods of the String class.ExampleLive Demopublic class Sample {    public static void main(String args[]){       String str = "Hello how are you";       String strUpper = str.toUpperCase();       System.out.println("Lower to upper : "+strUpper);       String strLower = str.toLowerCase();       System.out.println("Upper to lower : "+strLower);    } }OutputLower to upper : HELLO HOW ARE YOU Upper to lower : hello how are you