Java 8 Streams方法…

list.stream().forEach(System.out::println);

For循环输出列表的内容:

List<String> myList = new ArrayList<String>();
myList.add("AA");
myList.add("BB");

for ( String elem : myList ) {
  System.out.println("Element : "+elem);
}

结果:

Element : AA
Element : BB

如果你想打印在单行(只是为了信息):

String strList = String.join(", ", myList);
System.out.println("Elements : "+strList);

结果:

Elements : AA, BB

下面是一些关于打印list组件的例子:

public class ListExample {

    public static void main(String[] args) {
        List<Model> models = new ArrayList<>();

        // TODO: First create your model and add to models ArrayList, to prevent NullPointerException for trying this example

        // Print the name from the list....
        for(Model model : models) {
            System.out.println(model.getName());
        }

        // Or like this...
        for(int i = 0; i < models.size(); i++) {
            System.out.println(models.get(i).getName());
        }
    }
}

class Model {

    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

你可以试试:

2D(或以上) System.out.println (Arrays.deepToString (list.toArray ())); 1 d System.out.println (Arrays.toString (list.toArray ()))

    list.stream().map(x -> x.getName()).forEach(System.out::println);

我现在正好在做这个…

List<Integer> a = Arrays.asList(1, 2, 3);
List<Integer> b = Arrays.asList(3, 4);
List<int[]> pairs = a.stream()
  .flatMap(x -> b.stream().map(y -> new int[]{x, y}))
  .collect(Collectors.toList());

Consumer<int[]> pretty = xs -> System.out.printf("\n(%d,%d)", xs[0], xs[1]);
pairs.forEach(pretty);