Core Java Programming Course- String Basics

This video tutorial covers basic string operations in Java, including creating and concatenating strings using both the '+' operator and the 'concat' method. It explains how to find the length of a string and understand character indexing. The tutorial also demonstrates trimming unwanted spaces from strings and converting strings to uppercase and lowercase. Finally, it shows how to check if a string is empty using the 'isEmpty' method.

What is the result of concatenating a string and an integer using the '+' operator in Java?

• The integer is ignored.

• An error is thrown.

• The integer is converted to a string and concatenated.

• The integer is added to the string numerically.

Which method can be used to concatenate two strings?

• concat

• join

• merge

• append

How can you find the number of characters in a string?

• Using the 'count' method.

• Using the 'length' method.

• Using the 'index' method.

• Using the 'size' method.

What is the index of the first character in a string?

• 1

• 0

• The length of the string

• It depends on the string

What does the 'trim' method do to a string?

• Removes all spaces from the string.

• Removes spaces from the beginning and end of the string.

• Converts the string to lowercase.

• Converts the string to uppercase.

Which method would you use to convert a string to all uppercase letters?

• toCaps

• capitalize

• toLowerCase

• toUpperCase

How can you check if a string is empty in Java?

• Using the 'isBlank' method.

• Using the 'isVoid' method.

• Using the 'isEmpty' method.

• Using the 'isNull' method.