笔记：java输出数组，集合的内容

Java输出数组的内容

(2012-11-25 23:49:54)

标签： it

分类： 软件开发

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

1. 输出内容最常见的方式

[java] view plain copy print ?

1. //List类型的列表
   
2. Listlist=new ArrayList();
   
   
3. list.add("First");
   
4. list.add("Second");
   
5. list.add("Third");
   
6. list.add("Fourth");
   
7. System.out.println(list);

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

输出:
[First,
Second, Third, Fourth]

[java] view plain copy print ?

1. //String数组
   
2. class=javaname="code">String[]array=new String[]{"First","Second","Third","Fourth" };
   
   
3. System.out.println(array.toString());
   

// String数组

[java] view plain copy print ?

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

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

[java] view plain copy print ?

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

// 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。

[java] view plain copy print ?

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

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：

[java] view plain copy print ?

1. import java.util.ArrayList;
   
   
2. import java.util.Arrays;
   
3. import java.util.List;
   
4. 
   
5. 
   
6. public class PrintArray{
   
   
7. public static void main(String[]args){
   
   
8. Listlist=new ArrayList();
   
   
9. list.add("First");
   
   
10. list.add("Second");
    
    
11. list.add("Third");
    
    
12. list.add("Fourth");
    
    
13. 
    
14. 
    
15. System.out.println(list);
    
    
16. 
    
17. 
    
18. String[]array=new String[]{"First","Second","Third","Fourth" };
    
    
19. System.out.println(array.toString());
    
    
20. System.out.println(Arrays.toString(array));
    
    
21. 
    
22. 
    
23. String[]arr1=new String[]{"Fifth","Sixth" };
    
    
24. String[]arr2=new String[]{"Seventh","Eigth" };
    
    
25. String[][]arrayOfArray=new String[][]{arr1,arr2};
    
    
26. 
    
27. 
    
28. System.out.println(arrayOfArray);
    
    
29. System.out.println(Arrays.toString(arrayOfArray));
    
    
30. System.out.println(Arrays.deepToString(arrayOfArray));
    
    
31. }
    
32. }

import java.util.ArrayList; import java.util.Arrays; import java.util.List; public class PrintArray { public static void main(String[] args) { List list = new ArrayList(); 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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