Java 8 中Stream流的一些用法

public class Djmxlist {
    private String dxmc;
    private Integer sl;
    
	public String getDxmc() {
        return dxmc;
    }

    public void setDxmc(String dxmc) {
        this.dxmc = dxmc;
    }

    public Integer getSl() {
        return sl;
    }

    public void setSl(Integer sl) {
        this.sl = sl;
    }
}

插入一下数据

 List<Djmxlist> list=new ArrayList<>();
        for (int i = 1; i < 4; i++) {
            Djmxlist mx=new Djmxlist();
            mx.setDxmc("名称"+i);
            mx.setSl(i);
            list.add(mx);
        }
        Djmxlist mx1=new Djmxlist();
        mx1.setDxmc("名称"+1);
        mx1.setSl(1);
        list.add(mx1);

Stream流的一些用法

 int min=list.stream().mapToInt(Djmxlist::getSl).min().getAsInt();
 int max=list.stream().mapToInt(Djmxlist::getSl).max().getAsInt();
 int first=list.stream().mapToInt(Djmxlist::getSl).findFirst().getAsInt();
 List<Djmxlist> list1=list.stream().distinct().collect(Collectors.toList());;
 List<Djmxlist> list2=list.stream().filter(u->u.getSl()>2).collect(Collectors.toList());
 int zsl=list.stream().mapToInt(Djmxlist::getSl).sum();