Pretty-print a Map in Java

Question

I am looking for a nice way to pretty-print a Map.

map.toString() gives me: {key1=value1, key2=value2, key3=value3}

I

Answer 1

As a quick and dirty solution leveraging existing infrastructure, you can wrap your uglyPrintedMap into a java.util.HashMap, then use toString().

uglyPrintedMap.toString(); // ugly
System.out.println( uglyPrintedMap ); // prints in an ugly manner

new HashMap(jobDataMap).toString(); // pretty
System.out.println( new HashMap(uglyPrintedMap) ); // prints in a pretty manner