Map的key不变，value相加

package javademo;

import java.util.HashMap;
import java.util.Map;

public class MapTest {
    public static void main(String[] args) {
        Map<String, String> m = new HashMap<String, String>();
        String[] str = {"hello:1","java:1","hello:1"};
        for(String s : str){
            int i = s.indexOf(":");
            String key = s.substring(0,i);
            String value = s.substring(i+1);
            if(m.containsKey(key)){
                int val = (Integer.parseInt(m.get(key))+Integer.parseInt(m.get(key)));
                m.put(key, val+"");
            }else{
                m.put(key, value);
            }
        }
        
        for (String key : m.keySet()) {
               System.out.println("key= "+ key + " and value= " + m.get(key));
        }
    }
}