如何一个int数组转换为字符串在Java的toString方法 [英] How to convert an int array to String with toString method in Java

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问题描述

我使用的尝试使用的toString(INT [])方法,但我想我做错了:

<一个href=\"http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Arrays.html#toString%28int%5B%5D%29\">http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Arrays.html#toString(int[])

我的code:

  INT []数组=新INT [lnr.getLineNumber()+ 1];
INT I = 0;的System.out.println(与Array.toString());

输出是:

  [I @ 23fc4bec

我也尝试过这样的印花,但是:

 的System.out.println(新的String()的toString(阵列)。); // **对下一行的错误**
的toString()方法中的String类型是不适用的参数(INT [])

我把这个code出更大,更复杂的code,但如果需要,我可以添加它。但是,这应该给的一般信息。

我要寻找的输出,如Oracle的文档中:


  

再presentation字符串由数组的元素列表,包含在方括号([])中。相邻元素由字符,(逗号后面有一个空格)分隔。



解决方案

您需要的是 Arrays.toString(INT [])方法:

 进口java.util.Arrays中;INT []数组=新INT [lnr.getLineNumber()+ 1];
INT I = 0;..的System.out.println(Arrays.toString(阵列));

有一个静态 Arrays.toString 为每个不同的原始Java类型的辅助方法;一对<一个href=\"http://docs.oracle.com/javase/7/docs/api/java/util/Arrays.html#toString(int[])\"><$c$c>int[]这说:


 公共静态字符串的ToString(INT []一)


  
  

返回一个字符串,重新指定数组的内容presentation。再presentation字符串由数组的元素列表,包含在方括号([])。相邻元素由字符分隔(逗号后跟一个空格)。这些元素通过将String.valueOf转换为字符串(INT)。返回如果 A 为null。


I am using trying to use the toString(int[]) method, but I think I am doing it wrong:

http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Arrays.html#toString(int[])

My code:

int[] array = new int[lnr.getLineNumber() + 1];
int i = 0;

System.out.println(array.toString());

The output is:

[I@23fc4bec

Also I tried printing like this, but:

System.out.println(new String().toString(array));  // **error on next line**
The method toString() in the type String is not applicable for the arguments (int[])

I took this code out of bigger and more complex code, but I can add it if needed. But this should give general information.

I am looking for output, like in Oracle's documentation:

The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space).

解决方案

What you want is the Arrays.toString(int[]) method:

import java.util.Arrays;

int[] array = new int[lnr.getLineNumber() + 1];
int i = 0;

..      

System.out.println(Arrays.toString(array));

There is a static Arrays.toString helper method for every different primitive java type; the one for int[] says this:

public static String toString(int[] a)

Returns a string representation of the contents of the specified array. The string representation consists of a list of the array's elements, enclosed in square brackets ("[]"). Adjacent elements are separated by the characters ", " (a comma followed by a space). Elements are converted to strings as by String.valueOf(int). Returns "null" if a is null.

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