Java输出数组的内容

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Java输出数组的内容

作者：chszs，转载需注明。
作者博客主页：http://blog.youkuaiyun.com/chszs

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

// 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]]




           

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