Pretty-print a Map in Java
dictionary, java, pretty-print
Solution
Or put your logic into a tidy little class.
public class PrettyPrintingMap<K, V> {
private Map<K, V> map;
public PrettyPrintingMap(Map<K, V> map) {
this.map = map;
}
public String toString() {
StringBuilder sb = new StringBuilder();
Iterator<Entry<K, V>> iter = map.entrySet().iterator();
while (iter.hasNext()) {
Entry<K, V> entry = iter.next();
sb.append(entry.getKey());
sb.append('=').append('"');
sb.append(entry.getValue());
sb.append('"');
if (iter.hasNext()) {
sb.append(',').append(' ');
}
}
return sb.toString();
}
}
Usage:
Map<String, String> myMap = new HashMap<String, String>();
System.out.println(new PrettyPrintingMap<String, String>(myMap));
Note: You can also put that logic into a utility method.
Problem
I am looking for a nice way to pretty-print a `Map`. `map.toString()` gives me: `{key1=value1, key2=value2, key3=value3}` I want more freedom in my map entry values and am looking for something more like this: `key1="value1", key2="value2", key3="value3"` I wrote this little piece of code: ``` StringBuilder sb = new StringBuilder(); Iterator<Entry<String, String>> iter = map.entrySet().iterator(); while (iter.hasNext()) { Entry<String, String> entry = iter.next(); sb.append(entry.getKey()); sb.append('=').append('"'); sb.append(entry.getValue()); sb.append('"'); if (iter.hasNext()) { sb.append(',').append(' '); } } return sb.toString(); ``` But I am sure there is a more elegant and concise way to do this.