Java Arrays as Method Parameters: Two Ways to Pass Arrays, Do You Know?

This article explains the two passing methods of Java arrays as method parameters, based on the principle that "Java parameter passing is always pass-by-value", and that arrays are objects, so what is passed is a reference (memory address). **First method: Modifying elements** The method operates on the elements of the original array through the reference, and the original array will be modified. For example, in the `addOne` method, the parameter `arr` points to the same object as the original array `original`. Modifying `arr[i]` will directly change the elements of `original`. **Second method: Modifying the reference** The method makes the parameter point to a new array, and the original array remains unaffected. For example, in the `changeArray` method, the parameter `arr` points to a new array, but the reference of the original array `original` remains unchanged, so the content of the original array is not modified. **Core difference**: The former modifies the elements of the original array (the original array changes), while the latter modifies the parameter reference to point to a new array (the original array remains unchanged). **Note**: An array passes a reference rather than a full copy. Only modifying the elements affects the original array, while modifying the reference does not. Mastering these two methods can avoid the misunderstanding that "array parameters do not affect the original array".