Use EntrySet loops for map in Java

Based on the new features of JDK5, use a for loop map, such as the Key for loop map

123	for(String dataKey : paraMap.keySet())   {      System.out.println(dataKey );             }

Note how paramap is defined, if it is a simple map paramap = new HashMap (); The string in front can only be converted to object.

The key and value of the entire map

123456789101112

Map<Integer,String> map = new LinkedHashMap<Integer,String>();map.put(1, "星期一");map.put(2, "星期二");map.put(3, "星期三");map.put(4, "星期四");map.put(5, "星期五");map.put(6, "星期六");map.put(7, "星期日");for(Map.Entry<Integer, String> entry: map.entrySet()) { System.out.print(entry.getKey() + ":"+ entry.getValue() + "\t");}

Outputs:

1: Monday 2: Tuesday 3: Wednesday 4: Thursday 5: Friday 6: Saturday 7: Sunday

Use EntrySet loops for map in Java