编辑代码

import java.util.Map;
import java.util.HashMap;
class Main {
	public static void main(String[] args) {
        //JSRUN引擎2.0，支持多达30种语言在线运行，全仿真在线交互输入输出。
		System.out.println("Hello world!   - java.jsrun.net ");
        Map<String,String> map = new HashMap<>();
        map.put("name","alpha");
        map.put("age","32");
        map.put("sex","male");
        String name = map.get("name");
        String age = map.get("age");
        String sex = map.get("sex");
        String height = map.getOrDefault("height","175");
        System.out.println("[name]="+name+"[height]="+height);
        
        map.Set<Map.Entry<String, String>> entrySet = map.entrySet();
        Iterator<Map.Entry<String, String>> iterator = entrySet.iterator();
        while(iterator.hasNext())
        {
            Map.Entry<String,String>entry = iterator.next();
            String key = entry.getKey();
            String value = entry.getValue();
            System.out.println(key + "=" + value);
        }
        
        int size = map.size();
        System.out.println(size);
        Map<String,String> map1 = new HashMap<>();
        map1.put("height","178");
        map1.put("salary","5000");
        map.putAll(map1);
        System.out.println("map="+map);

	}
}