java stream流排序_java stream流 排序

// 按状态排序，排序顺序是PipelineState枚举类的顺序

List newPipelineList = pipelineList.stream().sorted(Comparator.comparing(Pipeline::getState)).collect(Collectors.toList());

Collections.reverse(newPipelineList); //排序翻转

public enum PipelineState {

PENDING,

RUNNING,

ERROR,

DONE

}

上面的stream流将数组按PENDING RUNNING ERROR DONE顺序排序，转换PipelineState属性的顺序，排序也将改变

可以一直使用.thenComparing()来进行多字段排序

如

List newPipelineList = pipelineList.stream().sorted(Comparator.comparing(Pipeline::getState).thenComparing(Pipeline::getStartAt).thenComparing(Pipeline::getExecAt)).collect(Collectors.toList());

多字段排序