In simpler words, the number of characters that a string contains is called the length of a String in Java. If you want to find the number of characters of a String, an inbuilt method is available in Java known as length(). The length of a Java string and the Unicode characters of the String are the same.
The length() method
An inbuilt length() method of the Java String class can be used when the length of a String has to be calculated. Strings are objects that are created with the help of the String class in Java, and the length() method belongs to this class and is a public member method. Hence, any type of string variable can use this method with the help of the . (dot) operator. The length() method calculates a String’s total number of characters.
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Internal implementation
Signature
Mentioned below is the string length() method signature:
public int length()
Return Value
This method returns the count of the total number of characters in Java.
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Java String Length Method Example:
The program given below will help to understand how to find the length of a String in Java. There are two Strings and the length of each String in Java will be calculated using the length() method.
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Using Length() Method to Determine String Size Java
If you want to determine string size in Java, you can follow this method:
// Java program to illustrate // how to get the length of String // in Java using length() method
// Driver Class public class Test { // main function public static void main(String[] args) { // Here str is a string object String str = "UpGrad" System.out.println("The size of " + "the String is " + str.length()); } }
Output:
The size of the String is 13
Comparing the Size of Two Strings
If you want to compare the length of string in Java, you need to follow this:
// Java program to illustrate how to check // whether the length of two strings is // equal or not using the length() method. import java.io.*; // Driver Class class GFG { // main function public static void main(String[] args) { String s1 = "abc"; String s2 = "xyz"; // storing the length of both the // strings in int variables int len1 = s1.length(); int len2 = s2.length(); // checking whether the length of // the strings is equal or not if (len1 == len2) { System.out.println( "The length of both the strings are equal and is " + len1); } else { System.out.println( "The length of both the strings are not equal"); } } }
Output:
The length of both the strings are equal and is 3
Example of an Advanced Java String Length
You might have to find length of a string in Java in various scenarios. The code that you can use to identify whether a string is a palindrome is as follows:
package com.mcnz.servlet; /* Find the length of a Java String example */ public class JavaPalindromeCheckProgram { public static void main(String[] args) { boolean flag = palindromeCheck("amanaplanacanalpanama"); System.out.println(flag); } /* This code uses the Java String length method in its logic */ public static boolean palindromeCheck(String string){ /* check if the Java String length is zero or one */ if(string.length() == 0 || string.length() == 1) { return true; } if(string.charAt(0) == string.charAt(string.length()-1)) { return palindromeCheck(string.substring(1, string.length()-1)); } return false; } }
In this method, a huge variety of string classes like length(), substring(), and charAt() are used.
How to Remove White Space from a Length of String in Java
Eliminating the white space is often crucial while manipulating a text or validating an input. The trim method is useful for achieving this.
String javaString = " String length example "; int stringSize= javaString.trim().length(); System.out.println(stringSize); //This Java String length trim example prints out 21
In this example, the white spaces are excluded from calculating the length of string in Java.
Companion Methods for Java String Length
A few companion methods associated with the Java string length are as follows:
- trim(): Used for removing white space so that you can find length of string in Java
- toUpperCase(): Makes all characters in a string uppercase
- toLowerCase(): Makes all characters in a string lowercase
- charAt(intindex): Can return a character to a particular position in the string
- substring(intindex): Can return a subset of a string in Java
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