56 lines
1.1 KiB
Java
56 lines
1.1 KiB
Java
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package aiyh.utils.fileUtil;
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import java.util.*;
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/**
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* @author EBU7-dev1-ayh
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* @create 2021/11/29 0029 13:53
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*/
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public class ProperUtil extends Properties {
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//LinkedHashSet有序，可以保证读取出来顺序不变
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private final LinkedHashSet<Object> keys = new LinkedHashSet<>();
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/**
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* 读取key集合
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*/
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@Override
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public Set<String> stringPropertyNames() {
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Set<String> set = new LinkedHashSet<>();
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for (Object key : keys) {
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set.add((String) key);
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}
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return set;
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}
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@Override
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public Set<Object> keySet() {
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return keys;
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}
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/**
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* 枚举可以直接进行遍历，但是和iterator一样，遍历过程中不能进行修改删除等操作
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* 若要在遍历过程中进行修改擦除等操作，建议使用stringPropertyNames方法
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*/
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@Override
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public synchronized Enumeration<Object> keys() {
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return Collections.enumeration(keys);
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}
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@Override
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public synchronized Object put(Object key, Object value) {
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keys.add(key);
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return super.put(key, value);
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}
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/**
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* 若要移除元素，要重写remove方法
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*/
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@Override
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public Object remove(Object o) {
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keys.remove(o);
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return super.remove(o);
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}
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}
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