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();