Java輸出數組的內容

Java輸出數組的內容

作者：chszs，轉載需註明。
作者部落客頁：http://blog.csdn.net/chszs

1. 輸出內容最常見的方式

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

輸出:
[First, Second, Third, Fourth]

// String數組
String[] array = new String[] { "First", "Second", "Third", "Fourth" };System.out.println(array.toString());
輸出:
[Ljava.lang.String;@12dacd1
2. 使用Array類輸出數組內容
// String數組String[] array = new String[] { "First", "Second", "Third", "Fourth" };System.out.println(Arrays.toString(array));
輸出:
[First, Second, Third, Fourth]
3. 輸出數組的數組
可以使用Arrays.deepToString()方法。
String[] arr1 = new String[] { "Fifth", "Sixth" };String[] arr2 = new String[] { "Seventh", "Eight" };// 數組的數組String[][] arrayOfArray = new String[][] { arr1, arr2 };// 比較下面的輸出
System.out.println(arrayOfArray);
System.out.println(Arrays.toString(arrayOfArray));
System.out.println(Arrays.deepToString(arrayOfArray));
輸出:
[[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));}}
輸出:
[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]]