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JAVA 集合 List 分組的兩種方法
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從網上找了兩種方法,效率差不多,這里貼出代碼供大家參考
實體類Data
- public class Data {
- private Long id ;
- private Long courseId ;
- private String content ;
- public Long getId() {
- return id;
- }
- public Data setId(Long id) {
- this.id = id;
- return this ;
- }
- public Long getCourseId() {
- return courseId;
- }
- public Data setCourseId(Long courseId) {
- this.courseId = courseId;
- return this ;
- }
- public String getContent() {
- return content;
- }
- public Data setContent(String content) {
- this.content = content;
- return this ;
- }
- }
排序類
- <pre name="code" class="java">import java.lang.reflect.Method;
- import java.util.ArrayList;
- import java.util.Collection;
- import java.util.HashMap;
- import java.util.Iterator;
- import java.util.List;
- import java.util.Map;
- import com.framework.util.ParamUtils;
- public class CommonUtils {
- /**
- * 分組依據接口,用於集合分組時,獲取分組依據
- *
- * @author ZhangLiKun
- * @title GroupBy
- * @date 2013-4-23
- */
- public interface GroupBy<T> {
- T groupby(Object obj);
- }
- /**
- *
- * @param colls
- * @param gb
- * @return
- */
- public static final <T extends Comparable<T>, D> Map<T, List<D>> group(Collection<D> colls, GroupBy<T> gb) {
- if (colls == null || colls.isEmpty()) {
- System.out.println("分組集合不能為空!");
- return null;
- }
- if (gb == null) {
- System.out.println("分組依據接口不能為Null!");
- return null;
- }
- Iterator<D> iter = colls.iterator();
- Map<T, List<D>> map = new HashMap<T, List<D>>();
- while (iter.hasNext()) {
- D d = iter.next();
- T t = gb.groupby(d);
- if (map.containsKey(t)) {
- map.get(t).add(d);
- } else {
- List<D> list = new ArrayList<D>();
- list.add(d);
- map.put(t, list);
- }
- }
- return map;
- }
- /**
- * 將List<V>按照V的methodName方法返回值(返回值必須為K類型)分組,合入到Map<K, List<V>>中<br>
- * 要保證入參的method必須為V的某一個有返回值的方法,並且該返回值必須為K類型
- *
- * @param list
- * 待分組的列表
- * @param map
- * 存放分組后的map
- * @param clazz
- * 泛型V的類型
- * @param methodName
- * 方法名
- */
- public static <K, V> void listGroup2Map(List<V> list, Map<K, List<V>> map, Class<V> clazz, String methodName) {
- // 入參非法行校驗
- if (null == list || null == map || null == clazz || !ParamUtils.chkString(methodName)) {
- System.out.print("CommonUtils.listGroup2Map 入參錯誤,list:" + list + " ;map:" + map + " ;clazz:" + clazz + " ;methodName:" + methodName);
- return;
- }
- // 獲取方法
- Method method = getMethodByName(clazz, methodName);
- // 非空判斷
- if (null == method) {
- return;
- }
- // 正式分組
- listGroup2Map(list, map, method);
- }
- /**
- * 根據類和方法名,獲取方法對象
- *
- * @param clazz
- * @param methodName
- * @return
- */
- public static Method getMethodByName(Class<?> clazz, String methodName) {
- Method method = null;
- // 入參不能為空
- if (null == clazz || !ParamUtils.chkString(methodName)) {
- System.out.print("CommonUtils.getMethodByName 入參錯誤,clazz:" + clazz + " ;methodName:" + methodName);
- return method;
- }
- try {
- method = clazz.getDeclaredMethod(methodName);
- } catch (Exception e) {
- System.out.print("類獲取方法失敗!");
- }
- return method;
- }
- /**
- * 將List<V>按照V的某個方法返回值(返回值必須為K類型)分組,合入到Map<K, List<V>>中<br>
- * 要保證入參的method必須為V的某一個有返回值的方法,並且該返回值必須為K類型
- *
- * @param list
- * 待分組的列表
- * @param map
- * 存放分組后的map
- * @param method
- * 方法
- */
- @SuppressWarnings("unchecked")
- public static <K, V> void listGroup2Map(List<V> list, Map<K, List<V>> map, Method method) {
- // 入參非法行校驗
- if (null == list || null == map || null == method) {
- System.out.print("CommonUtils.listGroup2Map 入參錯誤,list:" + list + " ;map:" + map + " ;method:" + method);
- return;
- }
- try {
- // 開始分組
- Object key;
- List<V> listTmp;
- for (V val : list) {
- key = method.invoke(val);
- listTmp = map.get(key);
- if (null == listTmp) {
- listTmp = new ArrayList<V>();
- map.put((K) key, listTmp);
- }
- listTmp.add(val);
- }
- } catch (Exception e) {
- System.out.print("分組失敗!");
- }
- }
- }
測試類
- import java.util.ArrayList;
- import java.util.LinkedHashMap;
- import java.util.List;
- import java.util.Map;
- import com.framework.common.CommonUtils.GroupBy;
- public class Test {
- /**
- * @param args
- */
- public static void main(String[] args) {
- // 准備一個集合
- final int loop = 1000 * 1000;
- List<Data> list = new ArrayList<Data>(); // size=8 * loop
- for (int i = 0; i < loop; i++) {
- list.add(new Data().setId(1L).setCourseId(200010L).setContent("AAA"));
- list.add(new Data().setId(2L).setCourseId(200010L).setContent("BBB"));
- list.add(new Data().setId(3L).setCourseId(200011L).setContent("CCC"));
- list.add(new Data().setId(4L).setCourseId(200011L).setContent("DDD"));
- list.add(new Data().setId(5L).setCourseId(200010L).setContent("EEE"));
- list.add(new Data().setId(6L).setCourseId(200011L).setContent("FFF"));
- list.add(new Data().setId(7L).setCourseId(200010L).setContent("GGG"));
- list.add(new Data().setId(8L).setCourseId(200012L).setContent("HHH"));
- }
- // 進行分組 1
- long time = System.currentTimeMillis();
- Map<Long, List<Data>> map2 = new LinkedHashMap<Long, List<Data>>();
- CommonUtils.listGroup2Map(list, map2, Data.class, "getId");// 輸入方法名
- long duration = System.currentTimeMillis() - time;
- System.out.println("分組一執行:" + duration + "毫秒!");
- // 分組二
- time = System.currentTimeMillis();
- Map<Long, List<Data>> map = CommonUtils.group(list, new GroupBy<Long>() {
- @Override
- public Long groupby(Object obj) {
- Data d = (Data) obj;
- return d.getCourseId(); // 分組依據為課程ID
- }
- });
- duration = System.currentTimeMillis() - time;
- System.out.println("分組二執行:" + duration + "毫秒!");
- }
- }
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