public class StringCompression {

public int compress(char[] array) {

if (array.length == 0) return 0;

StringBuilder accumulator = new StringBuilder();

char current = array[0];

int count = 1;

for (int index = 1 ; index < array.length ; index++) {

if (array[index] == current) {

count++;

} else {

accumulator.append(current).append(count > 1 ? count : "");

current = array[index];

count = 1;

}

}

accumulator.append(current).append(count > 1 ? count : "");

copyInto(array, accumulator);

return accumulator.length();

}

private void copyInto(char[] array, StringBuilder buffer) {

for (int index = 0 ; index < buffer.length() ; index++) {

array[index] = buffer.charAt(index);

}

}

}