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Copy pathHashTableTest.java
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55 lines (41 loc) · 1.76 KB
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import java.util.*;
/**
Hashtable的测试程序。
*/
public class HashTableTest {
public static void main(String[] args) {
testHashtableAPIs();
}
private static void testHashtableAPIs() {
// 初始化随机种子
Random r = new Random();
// 新建Hashtable
Hashtable table = new Hashtable();
// 添加操作
table.put("one", r.nextInt(10));
table.put("two", r.nextInt(10));
table.put("three", r.nextInt(10));
// 打印出table
System.out.println("table:"+table );
// 通过Iterator遍历key-value
Iterator iter = table.entrySet().iterator();
while(iter.hasNext()) {
Map.Entry entry = (Map.Entry)iter.next();
System.out.println("next : "+ entry.getKey() +" - "+entry.getValue());
}
// Hashtable的键值对个数
System.out.println("size:"+table.size());
// containsKey(Object key) :是否包含键key
System.out.println("contains key two : "+table.containsKey("two"));
System.out.println("contains key five : "+table.containsKey("five"));
// containsValue(Object value) :是否包含值value
System.out.println("contains value 0 : "+table.containsValue(new Integer(0)));
// remove(Object key) ： 删除键key对应的键值对
table.remove("three");
System.out.println("table:"+table );
// clear() ： 清空Hashtable
table.clear();
// isEmpty() : Hashtable是否为空
System.out.println((table.isEmpty()?"table is empty":"table is not empty") );
}
}