Map遍历的方法总结下来，大概分为四种，以下是具体的展示。
1.通过Map.KeySet遍历key和value
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| Map<String, String> map = new HashMap<>();
map.put("甘肃", "兰州");
map.put("陕西", "西安");
map.put("新疆", "乌鲁木齐");
map.put("青海", "西宁");
map.put("宁夏", "银川");
for (String key : map.keySet()) {
System.out.println("key= " + key + " and value= " + map.get(key));
}
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2.通过Map.entrySet遍历key和value
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| Map<String, String> map = new HashMap<>();
map.put("甘肃", "兰州");
map.put("陕西", "西安");
map.put("新疆", "乌鲁木齐");
map.put("青海", "西宁");
map.put("宁夏", "银川");
for (Map.Entry<String, String> entry : map.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
System.out.println("key= " + key + " and value= " + value);
}
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3.通过Map.entrySet使用iterator遍历key和value
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| Map<String, String> map = new HashMap<>();
map.put("甘肃", "兰州");
map.put("陕西", "西安");
map.put("新疆", "乌鲁木齐");
map.put("青海", "西宁");
map.put("宁夏", "银川");
Iterator<Map.Entry<String, String>> iterator = map.entrySet().iterator();
while (iterator.hasNext()) {
Map.Entry<String, String> entry = iterator.next();
String key = entry.getKey();
String value = entry.getValue();
System.out.println("key= " + key + " and value= " + value);
}
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4.通过Map.values()遍历value,无法遍历key
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| Map<String, String> map = new HashMap<>();
map.put("甘肃", "兰州");
map.put("陕西", "西安");
map.put("新疆", "乌鲁木齐");
map.put("青海", "西宁");
map.put("宁夏", "银川");
for (String value : map.values()) {
System.out.print("value= " + value);
}
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