summing list using java 8 streams : I have 

    List<Pocket> pockets;

and

    public class Pocket {
        String name;
        Double amount;
    }

pockets list contains:
    
    [
        {"pocket1", 280},
        {"pocket2", 320},
        {"pocket3", 100},
        {"pocket4", 125},
        {"pocket5", 150},
        {"pocket6", 175}
    ]

I need to get 650 from first pockets,

What I want to receive in the end is:

    [
        {"pocket1", 280},
        {"pocket2", 320},
        {"pocket3", 50}
    ]

How to implement it with Java Streams/Lamda?

Thanks in advance.