In this article, we will discuss string comparison using String’s equals() method

 

equals(Object anObject) method:

• This String method is used to perform string comparison
• Note: This String comparison is case-sensitive, there is one more variation to this equals() method i.e.; equalsIgnoreCase(), which is case-insensitive

Method Signature:

public boolean equals(Object anObject);

Returns:

Returns a boolean value either true or false

• True –> if both string contents are equal, considering CASE differences
• False –> if both string contents are NOT equal, considering CASE differences

 

Examples on equals() method:

• String comparison program using equals() method

StringEqualsMethod.java

package in.bench.resources.string.methods;

public class StringEqualsMethod {

	public static void main(String[] args) {

		// string literal and objects
		String str1 = "bench";
		String str2 = new String("bench");
		String str3 = new String("BENCH");

		// comparing string literal and string object
		boolean bool1 = str1.equals(str2);

		// printing to the console
		System.out.println("str1 & str2 are equal ? : " + bool1);

		// comparing string literal and string object
		boolean bool2 = str1.equals(str3);

		// printing to the console
		System.out.println("str2 & str3 are equal ? : " + bool2);

		// in-line equality check
		System.out.println("str1 & oracle are equal ? : " 
				+ str1.equals("oracle"));
	}
}

Output:

str1 & str2 are equal ? : true
str2 & str3 are equal ? : false
str1 & oracle are equal ? : false

 

References:

• https://docs.oracle.com/javase/tutorial/essential/concurrency/immutable.html
• https://docs.oracle.com/javase/tutorial/essential/concurrency/imstrat.html
• https://docs.oracle.com/javase/tutorial/java/data/strings.html
• https://docs.oracle.com/javase/6/docs/api/java/lang/String.html
• https://docs.oracle.com/javase/7/docs/api/java/lang/String.html
• https://docs.oracle.com/javase/8/docs/api/java/lang/String.html
• https://docs.oracle.com/javase/6/docs/api/java/lang/class-use/String.html
• https://docs.oracle.com/javase/7/docs/api/java/lang/class-use/String.html
• https://docs.oracle.com/javase/8/docs/api/java/lang/class-use/String.html
• https://docs.oracle.com/javase/6/docs/api/java/lang/StringBuffer.html
• https://docs.oracle.com/javase/7/docs/api/java/lang/StringBuffer.html
• https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuffer.html
• https://docs.oracle.com/javase/6/docs/api/java/lang/StringBuilder.html
• https://docs.oracle.com/javase/7/docs/api/java/lang/StringBuilder.html
• https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuilder.html

 

Happy Coding !!
Happy Learning !!