遍历HashMap

遍历HashMap

Example 1: 通过迭代key得到value中的值

 

try {

HashMap hm = new HashMap();

hm.put("1", "yi");

hm.put("2", "er");

hm.put("3", "san");

hm.put("4", "si");

hm.put("5", "wu");

Iterator it=hm.keySet().iterator();

while(it.hasNext()){

String key=(String)it.next();

System.out.println(hm.get(key));

}

} catch (Exception e) {

e.printStackTrace();

 

}

 

Example 2:直接迭代value中的值

 

try {

HashMap hm = new HashMap();

hm.put("1", "yi");

hm.put("2", "er");

hm.put("3", "san");

hm.put("4", "si");

hm.put("5", "wu");

Iterator it=hm.values().iterator();

while(it.hasNext()){

System.out.println(it.next());

}

} catch (Exception e) {

e.printStackTrace();

}

 

Example 3： 同时获得key和value

try {

HashMap hm = new HashMap();

hm.put("1", "yi");

hm.put("2", "er");

hm.put("3", "san");

hm.put("4", "si");

hm.put("5", "wu");

Iterator it=hm.entrySet().iterator();

while(it.hasNext()){

Map.Entry map=(Map.Entry)it.next();

System.out.println(map.getKey()+" - "+map.getValue());

}

} catch (Exception e) {

e.printStackTrace();

}