java基础--关于Map集合的简单使用

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

public class Test {
public static void main(String[] args) {
Map<String, String> testMap = new HashMap<String, String>();
testMap.put("1","一" );
testMap.put("2","二" );
testMap.put("3","三" );
//1.方式一，采用for循环,遍历Map集合
/*
for (Iterator<Entry<String, String>> i = testMap.entrySet().iterator(); i.hasNext();) {
Entry<String, String> entry  = i.next();
System.out.println(entry.getKey().toString());
System.out.println(entry.getValue().toString());
}*/
//2.方式二，采用while循环,遍历Map集合
Iterator<Entry<String, String>> iterator = testMap.entrySet().iterator();
Entry<String, String> entry = null;
while (iterator.hasNext()) {
entry = iterator.next();
System.out.println(entry.getKey());
System.out.println(entry.getValue());
}
}

}