ex.java

来自「sample project for J2SE」· Java 代码 · 共 45 行

package Chap9;

import java.util.*;

public class ex {

public static void main (String[] args) {
	// instantiate HashMap
	HashMap<String, Integer> hashMap =new HashMap<String, Integer>();
	// Set values
	/*hashMap.put("Coffee", "10");
	hashMap.put("Tea", "160");
	hashMap.put("Juice", "200");
	hashMap.put("Ice cream", "220");
	Iterator<String> f=hashMap.keySet().iterator();
	while(f.hasNext())
	{
		
		String fkey=f.next();
		String fval=hashMap.get(fkey);
		System.out.println(fkey + "," + fval);
	}
	System.out.println("Display hashMap : " + hashMap);
		*/
		
	for(String word:args){
		Integer freq=hashMap.get(word);
		//(freq==null?1:freq+1)
		hashMap.put(word, (freq==null?1:freq+1));
	}
		/*Iterator it=hashMap.keySet().iterator();
		String word;
		while(it.hasNext())
		{
			word=(String)it.next();
			System.out.println("Word: "+ word+"\t Value"+hashMap.get(word));
		}*/
		
			System.out.println(hashMap);
		
	
}
		
}