java数组添加一个元素怎么表示出来数据的值

Introduction

Java is an object-oriented programming language that provides a lot of useful features to developers. One of the most powerful features of Java is its ability to work with arrays. An array is a container object that holds a fixed number of values of a single data type. In this article, we're going to focus on adding an element to an array in Java.

The Array Class in Java

Arrays in Java are represented by the array class. This class provides a lot of useful methods that you can use to manipulate arrays. One of these methods is the Arrays.copyOf() method which can be used to add an element to an existing array.

Let's consider an example function that adds an element to an array in Java.

```java
public static int[] addElement(int[] array, int element) {
int[] newArray = Arrays.copyOf(array, array.length + 1);
newArray[newArray.length - 1] = element;
return newArray;
}
```

In the example above, we define a function called addElement() which takes an int[] array and an int element as arguments. The function then creates a new array called newArray using the Arrays.copyOf() method. This method creates a new array with the same content as the original array plus an extra element. We then add the new element to the newArray by assigning it to the last index of the array. Finally, we return the newArray.

Using the addElement() Function

Now that we have our addElement() function, let's see how we can use it to add an element to an existing array.

```java
public static void main(String[] args) {
int[] myArray = {1, 2, 3, 4, 5};
int newElement = 6;
int[] newArray = addElement(myArray, newElement);
System.out.println(Arrays.toString(newArray)); // Output: [1, 2, 3, 4, 5, 6]
}
```

In the example above, we define an int[] array called myArray which has 5 elements. We also define a newElement variable with a value of 6. We then call the addElement() function and pass in myArray and newElement as arguments. The function returns a new array called newArray which has all the elements of myArray plus the newElement. Finally, we print the newArray using the Arrays.toString() method which prints the contents of an array.

Conclusion

In this article, we learned how to add an element to an array in Java. We saw how the Arrays.copyOf() method can be used to create a new array with an extra element and how we can use this method to add elements to an existing array. We also saw an example function and how it can be used to add elements to an array in Java. With these techniques, you can easily add elements to arrays in your Java programs.