Java 中的HashMap泛型类

*clear()清空散列映射
*containsKey(Object key) 检查散链映射中是否有key(键)，如果有则返回true，否者返回false
*containsKey(Object value)检查散链映射中是否有value(值)，如果有则返回true，否者返回false
*get(Object key)返回key所对应的值
*isEmpty()判断散链映射是否为空
*remove(Object key)删除散链映射中键为key的“键值对”
*size()返回散链映射“键值对”数目

查询单词意思

import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;
import java.util.*;
public class Main {
    public static void main(String []args){
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task task=new Task();
        task.solve(1,in,out);
        out.close();
    }
    static class Task{
        public void solve(int testNumber,InputReader in,PrintWriter out){
            HashMap hashtable=new HashMap();
            hashtable.put("mountain","山");
            hashtable.put("water","水");
            hashtable.put("canvas","画");
            hashtable.put("fish","鱼");
            hashtable.put("dog","狗");
            hashtable.put("vehicle","车辆");
            hashtable.put("decay","腐败");
            String englishWord = in.next();
            if (hashtable.containsKey(englishWord)) {
                out.println(hashtable.get(englishWord));
            } else {
                out.println("没有此单词");
            }
        }
    }
    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;
        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }
        public long nextLong(){return Long.parseLong(next());}
        public int nextInt() {
            return Integer.parseInt(next());
        }
        public double nextDouble(){
            return Double.parseDouble(next());
        }
    }
}