Question

java 怎么样获取Map中第几个键值对

Answer 1

第一种方法根据键值的名字取值
import Java.util.HashMap;
import java.util.Map;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Map<String, Object> map=new HashMap<String, Object>();
map.put("id", "sunny");
map.put("value", "syl");

System.out.println(map.get("id"));
System.out.println(map.get("value"));
}
}
第二种方法 遍历
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Map<String, Object> map=new HashMap<String, Object>();
map.put("id", "sunny");
map.put("value", "syl");

Set<String> get = map.keySet();
for (String test:get) {
System.out.println(test+","+map.get(test));
}
}
}
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