Java String length method example


Java String length: String length() is used to get the length of a Java String. The string length method returns the number of character...

Java String length:

String length() is used to get the length of a Java String. The string length method returns the number of characters in String. The length is equal to the number of 16-bit Unicode characters in the string.


The signature of the String length() method is given below.

public int length()

This method returns int value for characters in string.

String length example 1:

In this example, will see a basic example program to demonstrate length method. First call length method and prints it's length.

package examples.java.w3schools.string;

public class StringLengthExample {
    public static void main(String[] args) {

        String input1 = "java-w3schools";
        int length1 = input1.length();
        System.out.println("Input String length1: " + length1);

        String input2 = "string length method";
        int length2 = input2.length();
        System.out.println("Input String length2: " + length2);

        String input3 = "";
        int length3 = input3.length();
        System.out.println("Input String length3: " + length3);


Input String length1: 14
Input String length2: 20
Input String length3: 0

String length example 2:

Checking the pin code is valid or not. In India, Valid pin code length should be 6 digit number. Below code to check the length is valid or not.

package examples.java.w3schools.string;

public class StringLengthExample {
    public static void main(String[] args) {

        String pincode1 = "500001";

        if (pincode1.length() == 6) {
            System.out.println("given pincode " + pincode1 + " is valid");
        } else {
            System.out.println("given pincode " + pincode1 + " is not valid");

        String pincode2 = "50000";

        if (pincode2.length() == 6) {
            System.out.println("given pincode " + pincode2 + " is valid");
        } else {
            System.out.println("given pincode " + pincode2 + " is not valid");



given pincode 500001 is valid
given pincode 50000 is not valid

Internal Implementation:

public int length() {
        return value.length >> coder();

Here value is the byte array which is declared in String class as below.

    private final byte[] value;
The value is used for character storage.
This field is trusted by the VM, and is a subject to constant folding if String instance is constant. Overwriting this field after construction will cause problems.

Please post your questions in comments section.



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JavaProgramTo.com: Java String length method example
Java String length method example
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