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Java program to compare two strings using String.compareTo() method

String.CompareTo() method - Here, you will learn how to compare two strings in java using String.CompareTo() method, which is a built-in method of String class.

String.CompareTo()

This is a predefined (build-in) method of string class in Java, it returns 0 if both strings are same otherwise it will return difference of first dissimilar characters.

Consider the program:

Given two strings (Input strings) and we have to compare them using String.compareTo() method.

import java.util.*;

class CompareStrings
{
	public static void main(String args[])
	{
		//declaring two string objects
		String str1,str2;
		//declaring input stream object 
		Scanner in = new Scanner(System.in);

		//input strings
		System.out.print("Enter first string: ");
		str1 = in.nextLine();
		System.out.print("Enter second string: ");
		str2 = in.nextLine();

		//comparing strings 
		if(str1.compareTo(str2)==0)
			System.out.println("Strings are equal.");
		else
			System.out.println("Strings are not equal.");
	}
}

Output

Complie: javac CompareStrings.java
Run: java CompareStrings

Output

Enter first string: Hello World!
Enter second string: Hello World!
Strings are equal. 

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