Asma.O Asma.O - 1 month ago 7
Java Question

convert two-dimensional array to string

I'm trying to convert a

String[][]
to a string for display in a GUI. Here's my code:

String[][] tableBornes = SearchPropertiesPlugin.FillBornesTable();
String table = tableBornes.toString();


Here's what it produces:


[[Ljava.lang.String;@19b8858



How can I get something more readable?

Answer

If you want to create one-line representation of array you can use Arrays.deepToString.


In case you want to create multi-line representation you will probably need to iterate over all rows and append result of Array.toString(array[row]) like

String[][] array = { { "a", "b" }, { "c" } };

String lineSeparator = System.lineSeparator();
StringBuilder sb = new StringBuilder();

for (String[] row : array) {
    sb.append(Arrays.toString(row))
      .append(lineSeparator);
}

String result = sb.toString();

Since Java 8 you can even use StringJoiner with will automatically add delimiter for you:

StringJoiner sj = new StringJoiner(System.lineSeparator());
for (String[] row : array) {
    sj.add(Arrays.toString(row));
}
String result = sj.toString();

or using streams

String result = Arrays
        .stream(array)
        .map(Arrays::toString) 
        .collect(Collectors.joining(System.lineSeparator()));
Comments