What are the common methods of java arrays?

Commonly used methods include length attribute, copy array, array traversal, array sorting, array conversion to string, etc. Detailed introduction: 1. Length attribute: used to get the length of an array. It is an attribute rather than a method. Example: int[] arr = {1, 2, 3}; int length = arr.length;; 2. Copy the array: Use the System.arraycopy() method or the copyOf() method of the Arrays class to copy the contents of the array to a new Arrays, etc.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

In Java, an array is a fixed-size data structure, but it provides a series of commonly used methods to operate on the elements and attributes of the array. The following are some commonly used array methods:

1. Length attribute: used to get the length of the array. It is an attribute rather than a method. Example: int[] arr = {1, 2, 3}; int length = arr.length;

2. Copy the array: Use the System.arraycopy() method or the Arrays class The copyOf() method copies the contents of an array to a new array.

int[] sourceArray = {1, 2, 3};
int[] destinationArray = new int[sourceArray.length];
// 使用 System.arraycopy()
System.arraycopy(sourceArray, 0, destinationArray, 0, sourceArray.length);
// 使用 Arrays.copyOf()
int[] newArray = Arrays.copyOf(sourceArray, sourceArray.length);

3. Array traversal: Use loops to traverse array elements.

int[] arr = {1, 2, 3};
// 使用 for 循环遍历
for (int i = 0; i < arr.length; i++) {
    System.out.println(arr[i]);
}
// 使用增强型 for 循环（for-each）
for (int num : arr) {
    System.out.println(num);
}

4. Array sorting: Use the Arrays.sort() method to sort the array.

int[] arr = {3, 1, 2};
// 对数组进行排序
Arrays.sort(arr);

5. Convert array to string: Use Arrays.toString() method to convert array to string.

int[] arr = {1, 2, 3};
// 将数组转换为字符串并打印输出
System.out.println(Arrays.toString(arr));

These methods are some functions commonly used when operating arrays in Java, but there are other methods in Java's Arrays class. available for use, depending on your needs and operations.

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