无法使Guava base64编码/解码有效 [英] Unable to make Guava base64 encode/decode work

问题描述

由于下面的hello-world程序对我不起作用，因此某处似乎存在一个非常愚蠢的错误.

It seems there is a very silly mistake somewhere as the following hello-world program is not working for me.

import com.google.common.io.BaseEncoding;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

String hello = "hello";
junit.framework.Assert.assertEquals(
    hello.getBytes(),
    BaseEncoding.base64().decode(
            BaseEncoding.base64().encode(hello.getBytes())
    )
);

我什至尝试了hello.getBytes("ISO-8859-1")

我想念什么?

推荐答案

数组(令人困惑)没有覆盖Object.equals()(类似地它们没有覆盖.toString()，这就是为什么您看到那些

Arrays (confusingly) do not override Object.equals() (similarly they don't override .toString(), which is why you see those useless \[Lsome.Type;@28a418fc strings when you print an array), meaning that calling .equals() on two equivalent arrays will not give you the result you'd expect:

System.out.println(new int[]{}.equals(new int[]{}));

这将打印false.啊.有关更多信息，请参见有效的Java项目25:首选列表而不是数组.

This prints false. Ugh. See Effective Java Item 25: Prefer lists to arrays for more.

相反，您应该在 Arrays 类可对数组执行此类操作.例如，这将打印true:

System.out.println(Arrays.equals(new int[]{}, new int[]{}));

因此，请尝试Arrays.equals()或JUnit的

So try Arrays.equals() or JUnit's Assert.assertArrayEquals() instead of Assert.assertEquals():

junit.framework.Assert.assertArrayEquals(
    hello.getBytes(),
    BaseEncoding.base64().decode(BaseEncoding.base64().encode(hello.getBytes())
    )
);

这应该符合预期.

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