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Signature of equalsIgnoreCase()

public boolean equalsIgnoreCase(String str)

equalsIgnoreCase() example -:

// Program to find whether value of String is same as value value of another String(Ignoring cases)


class IgnoreCase
{
public static void main(String[] ar)
{
String str1 = new String("WELCOME");
String str2 = new String("welcome");
String str3 = new String("Welcome");
String str4 = new String("WelComE");

System.out.println("First  String is " + str1);
System.out.println("Second String is " + str2);
System.out.println("Third  String is " + str3);
System.out.println("Fourth String is " + str4);

System.out.println("Values in first and second String equal?  " + str1.equalsIgnoreCase(str2));
System.out.println("Values in first and third  String equal?  " + str1.equalsIgnoreCase(str3));
System.out.println("Values in first and fourth String equal?  " + str1.equalsIgnoreCase(str4));

}
}

Output is :

First  String is WELCOME
Second String is welcome
Third  String is Welcome
Fourth String is WelComE
Values in first and second String  equal?  true
values in first and third  String  equal?  true
Values in first and fourth String  equal?  true

Program Analysis

• Case-insensitive equality check on the values of the first String with the second String returns true.
• Case-insensitive equality check on the values of the first String with the second String returns true.
• Case-insensitive equality check on the values of the first String with the second String returns true.

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Difference betweeen equals() and equalsIgnoreCase() method -:

• Method equals() peforms case-sensitive equality check on the values of two String objects.
• method equalsIgnoreCase() peforms case-insensitive equality check on the values of two String objects.

// Displaying the difference between equals() and equalsIgnoreCase() methods.


class IgnoreCase
{
public static void main(String[] ar)
{
String str1 = new String("Good Day");
String str2 = new String("GOOD DAY");

System.out.println("First  String is "  + str1);
System.out.println("Second String is " + str2);

//Case-sensitive check on values of first and second String object
System.out.println("equals() on first and second String object? " + str1.equals(str2));

//Case-insensitive check on values of first and second String object
System.out.println("equalsIgnoreCase() on first and second String object? " + str1.equalsIgnoreCase(str2));
}
}

Output is :

First  String is Good Day
Second String is GOOD DAY
equals() method on first and second String object? false
equalsIgnoreCase() on first and second String object?  true

• Case-sensitive equality check on the values of the first String with the second String returns false.
• Case-insensitive equality check on the values of the first String with the second String returns true.

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