Splice a field of the list set into a single string

take list A field of the set splices a single String

Yes 2 Methods

1. loop (lambad Expression method )
2. Recursively, the list A field of the set splices a single String

List<Employee> emps = Arrays.asList(
            new Employee(102, " Li Si ", 59, 6666.66, Employee.Status.BUSY),
            new Employee(101, " Zhang San ", 18, 9999.99, Employee.Status.FREE),
            new Employee(103, " Wang Wu ", 28, 3333.33, Employee.Status.VOCATION)
    );

    // take list A field of the set splices a single String
    @Test
    public void testList(){
    
        if(emps != null && emps.size() >=0){
    
            // The first 1 Kind of  lambad Expression method 
            String  s=  emps.stream().map(p->p.getName()).collect(Collectors.joining(","));
            System.out.println(s);
            // The first 2 Kind of   Recursively, the list A field of the set splices a single String
            String loopJoint = loopJointASC(emps, emps.size());
            System.out.println(loopJoint);
        }

    }

    public static String loopJointASC(List<Employee> list, int size) {
    
        if(list.size()<=0) return null;
        if(size==1) return list.get(list.size()-1).getName();
        String joinStr = ",";
        String name = list.get(list.size()-size).getName();
        size--;// Subscript value and recursion number decrease 1
        String loopJoint = loopJointASC(list, size);
        return name+joinStr+loopJoint;
    }

Running results