The output of the statement "CONCENTRATION".indexOf('T') is:

1. 9
2. 7
3. 6
4. (-1)

The following code to compare two strings is compiled, the following syntax error was displayed – incompatible types – int cannot be converted to boolean.

Identify the statement which has the error and write the correct statement. Give the output of the program segment.

void calculate()
{
String a = "KING", b = "KINGDOM";
boolean x = a.compareTo(b);
System.out.println(x);
}

Write a Java program to enter any sentence and convert the sentence to uppercase. Print only those words of the sentence whose first and last letters are the same.

Define a class to accept the gmail id and check for its validity.

A gmail id is valid only if it has:

→ @

→ .(dot)

→ gmail

→ com

Example: icse2024@gmail.com is a valid gmail id