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MyHashMap.java
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24 lines (24 loc) · 890 Bytes
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import java.util.*;
//定义一个HashMapSon类，它继承HashMap类
class myHashMap<K, V> extends HashMap<K,V> {
private static final long serialVersionUID = -5894887960346129860L;
// 重写HashMapSon类的toString()方法
@Override
public String toString() {
Set<Map.Entry<K, V>> keyset = this.entrySet();
Iterator<Map.Entry<K, V>> i = keyset.iterator();
if (!i.hasNext())
return "";
StringBuffer buffer = new StringBuffer();
buffer.append("{");//注意此程序与源代码的区别
for (;;) {
Map.Entry<K, V> me = i.next();
K key = me.getKey();
V value = me.getValue();
buffer.append(key.toString() + ":");
buffer.append(value.toString() + "\n");
if (!i.hasNext())
return buffer.append("}").toString();
}
}
}