如何从android中的One Arraylist获取Separate Data Item值

Question

Hello Friends i have one custom arraylist which include items like : [t_id(PK) cat_id(FK), cat_name,total] .

Suppose i enter five value on it like ({1,1,c1,100},{2,1,c1,200},{3,1,c1,300},{4,1,c2,400},{5,1,c2,500})

NOw i want Total value of Category "c1" and "c2"

Means in output it should be like

"c1=600" and "c2=900".

So any idea how can i solve it

Answer 1

I dont know how the bean was, here i tried something that may help you,

        Map<String, Integer> map = new HashMap<String, Integer>();
        for(Custom custom : customList)
        {
            if(map.containsKey(custom.getCat_name()))
            {
                Integer i = map.get(custom.getCat_name());
                map.put(custom.getCat_name(), i+custom.getTotal());
            }
            else
            {
                map.put(custom.getCat_name(), custom.getTotal());
            }
        }

        System.out.println("Map : "+map);

Output : Map : {c1=600, c2=900}

Answer 2

It's guess but what I understood is like this

public class Custom
{
int t_id(PK);
int cat_id(FK);
String cat_name;
int total;

public Custom(int t_id(PK),int cat_id(FK),String cat_name,int total)
{
this.t_id(PK)=t_id; 
this.cat_id(FK)=cat_id(FK);
this.cat_name=cat_name;
this.total=total;
}
}

ArrayList<Custom> list=new ArrayList<Custom>;

Now if you want to get total no for c1

Do it like this.

int totalC1=0;
for(Custom c:list)
{
if(c.cat_name.equals("c1"))
{
totalC1+=c.total;
}
}