public class TestClass {
    public static void main(String args[]){
        Map<Integer, String[]> myMap=new HashMap<>();
        for(int i=0;i<5;i++){
            int key=i;
            String[] value=new String[]{String.valueOf(i),String.valueOf(i+1),String.valueOf(i+2)};
            myMap.put(key, value);
        }
        for(Map.Entry<Integer, String[]> entry:myMap.entrySet()){
            String[] value=entry.getValue();
            for(String val:value){
                System.err.println("Key="+entry.getKey()+"-Value"+val);
            }
            System.out.println("-------------------------------------");
        }
    }
}

Key=0-Value0
Key=0-Value1
Key=0-Value2
-------------------------------------
Key=1-Value1
Key=1-Value2
Key=1-Value3
-------------------------------------
Key=2-Value2
Key=2-Value3
Key=2-Value4
-------------------------------------
Key=3-Value3
Key=3-Value4
Key=3-Value5
-------------------------------------
Key=4-Value4
Key=4-Value5
Key=4-Value6
-------------------------------------

Key=0-Value0
Key=0-Value1
Key=0-Value2-------------------------------------
-------------------------------------

Key=1-Value1
Key=1-Value2
Key=1-Value3
Key=2-Value2
Key=2-Value3
Key=2-Value4
Key=3-Value3
Key=3-Value4
-------------------------------------
Key=3-Value5
-------------------------------------
Key=4-Value4
Key=4-Value5
Key=4-Value6
-------------------------------------