如何在java中编写一个在数组中打印对象的方法？

Question

如何在java中打印数组中的对象

Answer 1

在^{}类中有几个有用的^{}和^{}方法

String[] strings = { "foo", "bar", "waa" };
System.out.println(Arrays.toString(strings)); // [foo, bar, waa]

另一种方法是自己在上面loop，然后分别打印每个项目

Answer 2

使用Apache Commons Lang：

org.apache.commons.lang.StringUtils.join(Arrays.asList(strings), ", ");

使用Spring核心：

org.springframework.util.StringUtils.collectionToDelimitedString(Arrays.asList(strings), ", ");

Answer 3

您可以使用for循环来完成

下面是一个例子：

  String[] colors = {"red","blue","black","green","yellow"};
  for (String color : colors) {
   System.out.println(color);
  }

同时检查：What's the simplest way to print a Java array?

正如Esko在上述链接中所引用的，这是最好的答案：

In Java 5 Arrays.toString(arr) or Arrays.deepToString(arr) for arrays within arrays.

Note that Object[] version calls .toString() of each object in array. If my memory serves me correct, the output is even decorated in the exact way you're asking.