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1、for循环添加去重
2、for 双循环去重
3、for 双循环重复坐标去重
4、Set去重
5、stream流去重
1、for循环添加去重 ListString oldList new ArrayList();oldList.add(张三);oldList.add(张三);oldList.add(李四String oldList new ArrayList();oldList.add(张三);oldList.add(张三);oldList.add(李四);oldList.add(王五);oldList.add(赵六);ListObject newList Lists.newArrayList();for (String name : oldList) {if (!newList.contains(name)){newList.add(name);}}System.out.println(原本的集合原素oldList);System.out.println(去重后的集合newList);// An highlighted block
var foo bar;打印结果如下 2、for 双循环去重
Testpublic void test77() {ListString oldList new ArrayList();oldList.add(张三);oldList.add(张三);oldList.add(李四);oldList.add(王五);oldList.add(赵六);for (int i 0; i oldList.size(); i) {for (int j oldList.size() - 1; j i; j--) {if (oldList.get(j).equals(oldList.get(i))) {oldList.remove(j);}}}System.out.println(原本的集合元素 oldList);}}
打印结果如下 3、for 双循环重复坐标去重
Testvoid contextLoads4() {ListString oldList new ArrayList();oldList.add(张三);oldList.add(张三);oldList.add(李四);oldList.add(王五);oldList.add(赵六);ListString newList Lists.newArrayList();newList.addAll(oldList);for (String name : newList) {if (oldList.indexOf(name) ! oldList.lastIndexOf(name)) {oldList.remove(oldList.lastIndexOf(name));}}System.out.println(原本的集合原素oldList);}// An highlighted block
var foo bar;打印结果如下 4、Set去重
Testvoid contextLoads5() {ListString oldList new ArrayList();oldList.add(张三);oldList.add(张三);oldList.add(李四);oldList.add(王五);oldList.add(赵六);ListString newList Lists.newArrayList(new HashSet(oldList));System.out.println(原本的集合原素newList);}// An highlighted block
var foo bar;打印结果如下 5、stream流去重
Testvoid contextLoads5() {ListString oldList new ArrayList();oldList.add(张三);oldList.add(张三);oldList.add(李四);oldList.add(王五);oldList.add(赵六);ListString collect oldList.stream().distinct().collect(Collectors.toList());System.out.println(原本的集合原素collect);}// An highlighted block
var foo bar;打印结果如下
