The length field is used to get the number of elements of an array or string. For arrays, length returns a non-negative integer representing the number of elements, and for strings, the length() method returns the number of characters. It should be noted that the length field is read-only for arrays, and the length method is also read-only for strings. length can be used in scenarios such as looping, array operations, and string processing.
length Usage in Java
In Java, the length
field is used for Get the length of an array or string. Simply put, it returns the number of elements.
Array
For arrays, the length
field is a non-negative integer that represents the number of elements in the array.
<code class="java">int[] arr = new int[]{1, 2, 3, 4, 5}; int length = arr.length; // length = 5</code>
String
For strings, the length()
method returns the number of characters in the string.
<code class="java">String str = "Hello"; int length = str.length(); // length = 5</code>
Usage Notes
length
The field is read-only for the array and cannot be modified. length
The method is read-only for strings and cannot modify the length of the string. length
returns the length of the first dimension. To get the length of other dimensions, nested access is required. length
can be used in various scenarios, such as looping, array operations, and string processing. The above is the detailed content of How to use length in java. For more information, please follow other related articles on the PHP Chinese website!