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javastring-concatenation

Concatenate auto generated strings in java with a space seperator in between

I have a string array variable which values changes continuously. Random arrays are generated from it. This is what i have:

String trans = Utility.GetColumnValue(testdata[k], "suggest_text_2");

The trans value changes continuously. How can i concatenate it with the previous values? How can i print every value of trans as it changes continuously? Do i need to use any buffer?

Solution

  • If you need the intermediate results, you will probably need something like this:

    String yourOldString;
String freshString;

// other code which updates freshString
yourOldString = yourOldString + " " + freshString;

    However if you do need to catch all updates but only print out the final result, use a StringBuilder:

    private static final String WHITESPACE = " ";

String yourOldString;
String freshString;
StringBuilder builder = new StringBuilder();
builder.append(yourOldString);

// other code which updates freshString
builder.append(WHITESPACE);
builder.append(freshString);

// once everything is done:
String resultString = builder.toString();