JavaSE-Stream流的终结方法_forEach_count_toArray_collect

目录

Stream流的终结方法

forEach

count

toArray

collect

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Stream流的终结方法

forEach

public class StreamDemo12 {
    public static void main(String[] args) {
        ArrayList<String> list1 = new ArrayList<>();
        Collections.addAll(list1,"张无忌","周芷若","赵敏","张强");
        list1.stream().forEach(s-> System.out.println(s));
    }
}

打印结果：

count

public class StreamDemo13 {
    public static void main(String[] args) {
        ArrayList<String> list1 = new ArrayList<>();
        Collections.addAll(list1,"张无忌","周芷若","赵敏","张强");
        System.out.println(list1.stream().count());
    }
}

打印结果：

toArray

public class StreamDemo14 {
    public static void main(String[] args) {
        ArrayList<String> list1 = new ArrayList<>();
        Collections.addAll(list1,"张无忌","周芷若","赵敏","张强");
        //这种方式创建的数组的元素类型为Object
        Object[] arr1 = list1.stream().toArray();
        System.out.println(Arrays.toString(arr1));
        //这种方式创建的数组的元素类型为String
        String[] arr2 = list1.stream().toArray(value -> new String[value]);
        System.out.println(Arrays.toString(arr2));
    }
}

打印结果：

collect

由于collect的讲解内容过多，所以我单独写了一篇文章，如果想了解collect的相关知识，请阅读这篇文章：JavaSE-Stream流的终结方法_collect-CSDN博客