java - Map, how to print both the "key string" and "value string" together

I'm new to Java and is trying to learn the concept of Maps.

I have came up with the code below. However, I want to print out the "key String" and "value String" at the same time.

ProcessBuilder pb1 = new ProcessBuilder();
Map mss1 = pb1.environment();
System.out.println(mss1.size());

for (String key: mss1.keySet()){
    System.out.println(key);
}

I could only find method that print only the "key String".

Answer

There are various ways to achieve this. Here are three.

    Map map = new HashMap();
    map.put("key1", "value1");
    map.put("key2", "value2");
    map.put("key3", "value3");


    System.out.println("using entrySet and toString");
    for (Entry entry : map.entrySet()) {
        System.out.println(entry);
    }
    System.out.println();

    System.out.println("using entrySet and manual string creation");
    for (Entry entry : map.entrySet()) {
        System.out.println(entry.getKey() + "=" + entry.getValue());

    }
    System.out.println();

    System.out.println("using keySet");
    for (String key : map.keySet()) {
        System.out.println(key + "=" + map.get(key));
    }
    System.out.println();

Output

using entrySet and toString
key1=value1
key2=value2
key3=value3

using entrySet and manual string creation
key1=value1
key2=value2

key3=value3

using keySet
key1=value1
key2=value2
key3=value3