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Compare two Strings in Java
Compare two strings using compareTo() method in Java. The syntax is as follows −
int compareTo(Object o)
Here, o is the object to be compared.
The return value is 0 if the argument is a string lexicographically equal to this string; a value less than 0 if the argument is a string lexicographically greater than this string; and a value greater than 0 if the argument is a string lexicographically less than this string.
Example
Let us now see an example −
public class Demo { public static void main(String args[]) { String str1 = "Strings are immutable"; String str2 = new String("Strings are immutable"); String str3 = new String("Integers are not immutable"); int result = str1.compareTo( str2 ); System.out.println(result); result = str2.compareTo( str3 ); System.out.println(result); } }
Output
0 10
Let us see another example wherein we are comparing two strings lexicographically, ignoring case differences using compareToIgnoreCase(). This method returns a negative integer, zero, or a positive integer as the specified String is greater than, equal to, or less than this String, ignoring case considerations.
The syntax is as follows −
int compareToIgnoreCase(String str)
Here, str is the string to be compared.
Example
Let us now see an example to compare strings, ignoring case −
public class Demo { public static void main(String args[]) { String str1 = "Strings are immutable"; String str2 = "Strings are immutable"; String str3 = "Integers are not immutable"; int result = str1.compareToIgnoreCase( str2 ); System.out.println(result); result = str2.compareToIgnoreCase( str3 ); System.out.println(result); result = str3.compareToIgnoreCase( str1 ); System.out.println(result); } }
Output
0 10 -10