How to use length in java

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.
• For multi-dimensional arrays, 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.

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