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As evident from its name, length() method of String class gives us the total number of characters in a String object.

Signature of length() method

public int length()

• Access modifier - length() method is a public method,
• Parameter passed - No value is passed to this method.
• Value returned - This method returns an int value, which tells us total number of characters in a String on which this method is invoked.

Note :

While calculating the total length of a String, the character at the first index is counted as 1 and not 0, i.e. one-based index .

length() example

In the upcoming example, we have initialized two String objects and we are calling length() method on each of these String objects to determine their length.

// Program to find the total length of a String.


class StringLen
{
public static void main(String[] ar)
{
String str1= new String("01234567");

System.out.println("First String is " + str1);
System.out.println("Length of first String is "+ str1.length());

System.out.println();
String str2= new String("String Chapter");

System.out.println("Second String is " + str2);
System.out.println("Length of second String is "+ str2.length());

}
}

Output is :

First String is 01234567
Length of first String is 8

Second String is String Chapter
Length of second String is 14

Program Analysis

• In this code above, calling length() method on the first String object, returns int value 8, which is the total number of characters in this String.
• Calling length() method on the second String object has returned 14, i.e. the total number of characters in this String object.

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Finding length of an empty String object.

In the upcoming example, we have finding length of a String object which is created but not initialized with a value.

// Program to find the length of an empty String object


class StringLen
{
public static void main(String[] ar)
{
String str1= new String();

System.out.println("String contains : " + str1);
System.out.println("Length of the String is "+ str1.length());

System.out.println();
str1 = "Today is Tuesday";

System.out.println("String after its initialization : " + str1);
System.out.println("Length of the String is "+ str1.length());

}
}

Output is :

String contains :
Length of the String is 0

String after its initialization : Today is Tuesday
Length of the String is 16

Program Analysis

• In this code above, calling length() method on an empty String object, returns int value 0, because this String object is created but not initialized with a value.
• Next this object is initialized with a value and length() method is called on it again, which returns 16, i.e. the total number of characters in this String object.

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