例如,我有一个名为RecordGroup的Java对象。类签名如下:
public class RecordGroup {
private String owner;
private Integer startRow;
private Integer recordCount;
public RecordGroup() {
}
public RecordGroup(String owner, Integer startRow, Integer recordCount) {
this.owner = owner;
this.startRow = startRow;
this.recordCount = recordCount;
}
public String getOwner() {
return owner;
}
public void setOwner(String owner) {
this.owner = owner;
}
public Integer getRecordCount() {
return recordCount;
}
public void setRecordCount(Integer recordCount) {
this.recordCount = recordCount;
}
public Integer getStartRow() {
return startRow;
}
public void setStartRow(Integer startRow) {
this.startRow = startRow;
}
}
同时,我有一个列表,它保存了如下所示的对象列表。
public class Test {
List<'RecordGroup'> mergerMap = new ArrayList<'RecordGroup'>();
mergerMap.add(new RecordGroup("RECORD", 1, 6));
mergerMap.add(new RecordGroup("RECORD", 7, 9));
mergerMap.add(new RecordGroup("RECORD", 3, 4));
mergerMap.add(new RecordGroup("ZONE", 3, 1));
mergerMap.add(new RecordGroup("MODULE", 5, 6));
mergerMap.add(new RecordGroup("ZONE", 14, 28));
mergerMap.add(new RecordGroup("ZONE", 6, 30));
mergerMap.add(new RecordGroup("MODULE", 1, 60));
mergerMap.add(new RecordGroup("OFFICE", 2, 4));
mergerMap.add(new RecordGroup("OFFICE", 8, 6));
mergerMap.add(new RecordGroup("USER", 1, 6));
mergerMap.add(new RecordGroup("USER", 9, 8));
mergerMap.add(new RecordGroup("USER", 5, 7));
mergerMap.add(new RecordGroup("OFFICE", 3, 1));
我的问题是,如何按照它们的“owner”和“startRow”对上述RecordGroup对象列表进行排序,以便可以通过所有者分组记录,即首先显示“ZONE”组,然后是“OFFICE”组,接着是“USER”组,然后是“MODULE”组,最后是“RECORD”组。在排序和分组时,还应考虑“startRow”字段,即按升序排列“startRow”字段的值来排列每个组。
输出应该像这样:
mergerMap.add(new RecordGroup("ZONE", 3, 1));
mergerMap.add(new RecordGroup("ZONE", 6, 30));
mergerMap.add(new RecordGroup("ZONE", 14, 28));
mergerMap.add(new RecordGroup("OFFICE", 2, 4));
mergerMap.add(new RecordGroup("OFFICE", 3, 1));
mergerMap.add(new RecordGroup("OFFICE", 8, 6));
mergerMap.add(new RecordGroup("USER", 1, 6));
mergerMap.add(new RecordGroup("USER", 5, 7));
mergerMap.add(new RecordGroup("USER", 9, 8));
mergerMap.add(new RecordGroup("MODULE", 1, 60));
mergerMap.add(new RecordGroup("OFFICE", 2, 4));
mergerMap.add(new RecordGroup("MODULE", 5, 6));
mergerMap.add(new RecordGroup("RECORD", 1, 6));
mergerMap.add(new RecordGroup("RECORD", 3, 4));
mergerMap.add(new RecordGroup("RECORD", 7, 9));