Map value
In this chapter you will learn:
Get value set from a Map
values() method from Map returns all values as a set.
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/* ja va2s . c o m*/
public class Main {
public static void main(String[] a) {
Map<String,String> map = new HashMap<String,String>();
map.put("key1", "value1");
map.put("key2", "value2");
map.put("key3", "value3");
Collection set = map.values();
Iterator iter = set.iterator();
while (iter.hasNext()) {
System.out.println(iter.next());
}
}
}
Get value by key
Once we know a key we can try to get its mapping value by calling
get method.
import java.util.HashMap;
import java.util.Map;
/* j a v a 2 s . c o m*/
public class Main{
public static void main(String[] a) {
Map<String,String> map = new HashMap<String,String>();
map.put("key1", "value1");
map.put("key2", "value2");
map.put("key3", "value3");
System.out.println(map.get("key2"));
}
}
The code above generates the following result.
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What you will learn in the next chapter:
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