[英]Remove objects with similar values from ArrayList
我正在使用ArrayList,在这里我想从Arraylist中删除具有相似值的对象。 我尝试了许多通过stackoverflow发布的解决方案,但是由于哪些代码不起作用,我的代码中出现了问题。 我正在获得带有双头饼干的清单。
这是我的代码:
public class StateCityModel {
private String id ;
private String code ;
private String name ;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof StateCityModel))
return false;
return id.equals(((StateCityModel) obj).getId());
}
@Override
public int hashCode() {
return (id == null) ? 0 : id.hashCode();
}
}
代码在ArrayList中添加值
businessTypeListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView , View view , int position , long l) {
businessTypeObj = clubsList.get(position);
selectedBusinessTypeList.add(businessTypeObj);
}
}
});
删除具有相似值的对象的代码。
Set<StateCityModel> unique = new LinkedHashSet<StateCityModel>(selectedBusinessTypeList);
selectedBusinessTypeList = new ArrayList<StateCityModel>(unique);
完成上述代码后,我在selectedBusinessTypeList中获取具有相似值的对象。
请帮帮我,我找不到上面代码中的错误。
你也可以这样
步骤1:仅将ID不相同的那些数据插入到arraylist中,因此在此之后,您无需从arraylist中删除重复的元素。
businessTypeListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView , View view , int position , long l) {
businessTypeObj = clubsList.get(position);
selectedBusinessTypeList.add(businessTypeObj);
}
}
});
替换为
businessTypeListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView , View view , int position , long l) {
}
StateCityModel stateCityModel = new StateCityModel();
stateCityModel = clubsList.get(position);;
if (!selectedBusinessTypeList.contains(stateCityModel)){
selectedBusinessTypeList.add(stateCityModel);
}
}
});
第二步:删除不需要的
Set<StateCityModel> unique = new LinkedHashSet<StateCityModel>(selectedBusinessTypeList);
selectedBusinessTypeList = new ArrayList<StateCityModel>(unique);
我猜您在列表中看到重复的值了吗? 由于selectedBusinessTypeList的引用已更改。 通过传递新的selectedBusinessTypeList来创建新适配器,从而更改适配器,并将该适配器再次设置为该onClick内部的listview
您可以替换代码以通过以下几行添加值:
businessTypeListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
businessTypeObj = clubsList.get(position);
if (!selectedBusinessTypeList.contains(businessTypeObj)) {
selectedBusinessTypeList.add(businessTypeObj);
}
}
});
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