java8 从对象集合中取出某个字段的集合详解编程语言

//定义list集合 List P list = Arrays.asList(new P(1, "哈哈"), new P(2, "嘿嘿"), new P(3, "呵呵")); //从list集合中，取出字段name的列表 List String names = list.stream().map(p - p.getName()).collect(Collectors.toList()); System.out.println(names); class P{ int id; String name; public P(int id, String name) { this.id = id; this.name = name; public int getId() { return id; public void setId(int id) { this.id = id; public String getName() { return name; public void setName(String name) { this.name = name; }

 

 

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