Java：引用其他类的方法

1其他类成员名：：方法

public class shuangliejihe {
    public static void main(String[] args) {
        ArrayList<String> a = new ArrayList<>();
        Collections.addAll(a,"1221","222","32","4","5","6","7","8","9","10");
        a.stream().filter(new Predicate<String>() {
            @Override
            public boolean test (String s){
                return s.length() > 3;
            }
        }).forEach(System.out::println);
        //new....这个引用处形参是函数是接口
        //自己写个类，调用方法
        Stringoperator s = new Stringoperator();
        a.stream().filter(s::stringJudge).forEach(s1->System.out.println(s1));
    }
}
}
public class Stringoperator {
    public boolean stringJudge(String str) {
        return str.length() > 3;
    }

2：本类

this：：方法（引用处不能是静态方法）

3父类

super：：方法（引用处不能是静态方法）