如何使用 Java 中的 toString 方法将 int 数组转换为 String [英] How to convert an int array to String with toString method in Java

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问题描述

我正在尝试使用 toString(int[]) 方法,但我认为我做错了:

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

我的代码:

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

输出为:

[I@23fc4bec

我也尝试过这样打印,但是:

System.out.println(new String().toString(array));//**下一行出错**String 类型中的 toString() 方法不适用于参数 (int[])

我从更大更复杂的代码中删除了这段代码,但如果需要,我可以添加它.但这应该提供一般信息.

我正在寻找输出,就像在 Oracle 的文档中一样:

<块引用>

字符串表示由数组元素的列表组成,用方括号([]")括起来.相邻元素由字符,"(逗号后跟空格)分隔.

解决方案

你想要的是 Arrays.toString(int[]) 方法:

import java.util.Arrays;int[] array = new int[lnr.getLineNumber() + 1];int i = 0;..System.out.println(Arrays.toString(array));

对于每种不同的原始 Java 类型,都有一个静态的 Arrays.toString 辅助方法;int[] 是这样说的:

<块引用>

public static String toString(int[] a)

返回指定数组内容的字符串表示形式.字符串表示由数组元素的列表组成,用方括号括起来([]").相邻元素由字符 ", "(逗号后跟空格)分隔.元素通过 String.valueOf(int) 转换为字符串.如果 a 为空,则返回 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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