如何使用 Java 8 循环和打印二维数组
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How to Loop and Print 2D array using Java 8
提问by MChaker
Consider this two dimentional array
考虑这个二维数组
String[][] names = { {"Sam", "Smith"},
{"Robert", "Delgro"},
{"James", "Gosling"},
};
Using the classic way, if we want to access each element of a two dimensional array, then we need to iterate through two dimensional array using two for loops.
使用经典方式，如果我们想访问二维数组的每个元素，那么我们需要使用两个 for 循环来遍历二维数组。
for (String[] a : names) {
for (String s : a) {
System.out.println(s);
}
}
Is there a new elegant way to loop and Print 2D array using Java 8 features (Lambdas,method reference,Streams,...)?
是否有一种新的优雅方式来使用 Java 8 功能（Lambdas、方法参考、Streams 等）循环和打印 2D 数组？
What I have tried so far is this:
到目前为止我尝试过的是：
Arrays.asList(names).stream().forEach(System.out::println);
Output:
输出：
[Ljava.lang.String;@6ce253f1
[Ljava.lang.String;@53d8d10a
[Ljava.lang.String;@e9e54c2
回答by Radiodef
Keeping the same output as your forloops:
保持与for循环相同的输出：
Stream.of(names)
.flatMap(Stream::of)
.forEach(System.out::println);
(See Stream#flatMap.)
（见Stream#flatMap。）
Also something like:
还有类似的东西：
Arrays.stream(names)
.map(a -> String.join(" ", a))
.forEach(System.out::println);
Which produces output like:
产生如下输出：
Sam Smith Robert Delgro James Gosling
(See String#join.)
（见String#join。）
Also:
还：
System.out.println(
Arrays.stream(names)
.map(a -> String.join(" ", a))
.collect(Collectors.joining(", "))
);
Which produces output like:
产生如下输出：
Sam Smith, Robert Delgro, James Gosling
(See Collectors#joining.)
Joining is one of the less discussed but still wonderful new features of Java 8.
加入是 Java 8 中讨论较少但仍然很棒的新特性之一。
回答by Reimeus
In standard Java
在标准 Java 中
System.out.println(Arrays.deepToString(names));
回答by Paul Boddington
Try this
试试这个
Stream.of(names).map(Arrays::toString).forEach(System.out::println);
