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java中Map循环的几种方式


package com.xhx.collection;

import org.junit.Test;

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

/**
* xuhaixing
* 2018/7/15 19:59
**/
public class TestHashMapApp {


/**
* 循环的几种方式
*/
@Test
public void testHashMap1(){
Map<String,String> map = new HashMap<String, String>();
map.put("a","aaa");
map.put("b","bbb");
map.put("c","ccc");
map.put("d","ddd");

//通过key Set<T> key = map.keySet()
for(String key:map.keySet()){
System.out.println("key="+key+" value="+map.get(key));
}

//key和value都循环
for(Map.Entry<String,String> entry : map.entrySet()){
System.out.println("key="+entry.getKey()+" value="+entry.getValue());
}

//通过迭代器
Iterator<Map.Entry<String, String>> iterator = map.entrySet().iterator();
while (iterator.hasNext()){
Map.Entry<String, String> entry = iterator.next();
System.out.println("key="+entry.getKey()+" value="+entry.getValue());
}

//只循环value
for(String value : map.values()){
System.out.println("value="+value);
}

}
}

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java中Map循环的几种方式_java

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