Java输出数组的内容

1. 输出内容最常见的方式

// List<String>类型的列表
List<String> list = new ArrayList<String>();
list.add("First");
list.add("Second");
list.add("Third");
list.add("Fourth");
System.out.println(list);

输出:
[First, Second, Third, Fourth]

// String数组
String[] array = new String[] { "First", "Second", "Third", "Fourth" };
System.out.println(array.toString());

输出:
[Ljava.lang.String;@12dacd1

2. 使用Array类输出数组内容

  Arrays.toString(array) 方法：

// String数组
String[] array = new String[] { "First", "Second", "Third", "Fourth" };
System.out.println(Arrays.toString(array));

输出:
[First, Second, Third, Fourth]

3. 输出数组的数组

可以使用Arrays.deepToString()方法。

 
String[] arr1 = new String[] { "Fifth", "Sixth" };
String[] arr2 = new String[] { "Seventh", "Eight" };
// 数组的数组
String[][] arrayOfArray = new String[][] { arr1, arr2 };
// 比较下面的输出
System.out.println(arrayOfArray);
System.out.println(Arrays.toString(arrayOfArray));
System.out.println(Arrays.deepToString(arrayOfArray));

输出:
[[Ljava.lang.String;@1ad086a
[[Ljava.lang.String;@10385c1, [Ljava.lang.String;@42719c]
[[Fifth, Sixth], [Seventh, Eighth]]

再看下面的完整例子：

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
 
 
public class PrintArray {
	public static void main(String[] args) {
		List<String> list = new ArrayList<String>();
		list.add("First");
		list.add("Second");
		list.add("Third");
		list.add("Fourth");
 
 
		System.out.println(list);
 
 
		String[] array = new String[] { "First", "Second", "Third", "Fourth" };
		System.out.println(array.toString());
		System.out.println(Arrays.toString(array));
 
 
		String[] arr1 = new String[] { "Fifth", "Sixth" };
		String[] arr2 = new String[] { "Seventh", "Eigth" };
		String[][] arrayOfArray = new String[][] { arr1, arr2 };
 
 
		System.out.println(arrayOfArray);
		System.out.println(Arrays.toString(arrayOfArray));
		System.out.println(Arrays.deepToString(arrayOfArray));
	}
}

输出:

[First, Second, Third, Fourth]
[Ljava.lang.String;@12dacd1
[First, Second, Third, Fourth]
[[Ljava.lang.String;@1ad086a
[[Ljava.lang.String;@10385c1, [Ljava.lang.String;@42719c]
[[Fifth, Sixth], [Seventh, Eigth]]
 

转载地址：https://blog.csdn.net/chszs/article/details/8216142