Length. A Java String object may be null—but if it exists, it has zero or more characters. This character count is its length. With length() we get this number.
In a loop over characters, we can proceed from 0 to length() minus 1. A string's length has many uses in programs. We can take the length of a literal directly.
Detail We call the length method on each string variable reference. This returns the character count.
public class Program {
public static void main(String[] args) {
// Create strings with literals.
String value1 = "Java";
String value2 = "Programmer";
// Concatenate strings.
String value3 = value1 + " " + value2;
// Print string.
System.out.println(value3);
// Get string lengths.
int length1 = value1.length();
int length2 = value2.length();
int length3 = value3.length();
// Print lengths.
System.out.println(length1);
System.out.println(length2);
System.out.println(length3);
}
}Java Programmer
4
10
15
Literal length. This program uses a literal "abc" and immediately takes the length of that literal. This returns the number 3. This is valid Java syntax.
public class Program {
public static void main(String[] args) {
// Take the length of a literal directly.
int length = "abc".length();
System.out.println(length);
}
}3
Some notes. When using string literals in a program, we want to avoid confusing code. It is clearer to use length() on a literal than encode the magic value 3 in a program.
A summary. The length() method is called on a String object. The String must not be null. Length returns the character count in the string data.
Dot Net Perls is a collection of tested code examples. Pages are continually updated to stay current, with code correctness a top priority.
Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.
This page was last updated on Dec 30, 2021 (edit link).
