参考手册

参考手册

实例 Java 循环遍历一个 HashMap

​x
 
import java.util.HashMap;
​
public class Main {
  public static void main(String[] args) {
    HashMap<String, String> capitalCities = new HashMap<String, String>();
    capitalCities.put("England", "London");
    capitalCities.put("Germany", "Berlin");
    capitalCities.put("Norway", "Oslo");
    capitalCities.put("USA", "Washington DC");
    
    for (String i : capitalCities.keySet()) {
      System.out.println("key: " + i + " value: " + capitalCities.get(i));
    }
  }
}
​
​
                    

输出结果

key: USA value: Washington DC
key: Norway value: Oslo
key: England value: London
key: Germany value: Berlin